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Slipform Questions from Readers of Living Homes
with replies by Thomas J. Elpel



Questions Policy
      To avoid re-writing my book Living Homes for every person that comes along, please read the book before you write to me. Then, if you have any questions beyond what is presented in the text, then yes, please do write and ask away! I may be a little slow to answer, since I have more than a few distractions, but I will get back to you in time, and I will answer your question to the best of my abilities. Please let me know if I can post your letter and name to the website. Thanks!

      Also, if you have a better answer to a question than I do, or additional useful information, then please send me a note through our E-mail Contact Page, and I'll add your commentary to the web page. Questions and answers on these pages will help guide revisions of future editions of Living Homes.

NOTE: Are you offering a stone masonry class?
Do you want some volunteer labor to help build your home?
If the answer is yes to either question, please click here.

Where can I find free rocks for building with?

      This question was not in a letter, but it has come up a few times. There are many places you can find free rocks. Farms are always a good choice, where farmer's have removed them from their fields and stacked them in convenient piles. Just ask, and you will mostly likely be given permission.

      Another source is public lands, especially here in the west where there are millions of acres of public lands. The Bureau of Land Management (BLM) has a casual-use policy: You do not need any kind of permit, as long as you are collecting rocks by hand (no heavy equipment) for personal, non-commercial use only. In other words, you can collect all you want for building your own home, fireplace, retaining walls, etc. Just stay on the roads with your truck and don't do any kind of excavation work. There are exceptions for special rocks like petrified wood or obsidian, and there are areas of special designation where collecting would be prohibited, but otherwise the rocks are free for the collecting. Inquire at your local office for issues of special concern.

      You will need a permit to collect rocks on Forest Service lands, but the permit is free and you can collect up to five tons per year and get a new permit the following year. A ton of rocks is approximately one pickup load about a foot deep. (That is a lot of weight; you don't want any more than that in the back of the truck.) The restrictions are similar to those on BLM lands--all work must be done by hand, without heavy equipment, and be sure to keep your vehicle on designated roads. Again, check in at a local office for restrictions on specific areas or types of rocks.

      On state-owned lands here in Montana you need to obtain a rock picking permit from a local DNRC field office (Department of Natural Resources and Conservation) for collecting any rocks. State lands in Montana are managed for the benefit of the public school system. A rock-picking permit costs about $10 a ton. You can pick as much rock as you want, as long as you pay the $10/ton fee. Again, you must be picking rocks by hand, and you must have legal access. Using heavy equipment requires a performance bond for reclamation.

      The majority of the rocks we used to build our house came off of county right-of-ways. Basically, a primitive dirt road going into the mountains through a mix of private, state, and federal lands is often a county road, at least around here. You can consult local maps for guidance. The county owns a 60 foot right -of-way, measured as 30 feet each direction from the center of the road. Local laws will vary, but here in Madison County, Montana, the rocks are considered a nuisance. The county has no rock policy, but they are definitely glad to be rid of them. While building our house, we often joked that we should send the county a bill for all the rocks we picked out of the roads...

Will round rocks work for slipform stone masonry?

Dear Thomas,
      I have been actively reading your book now for the last few days and getting very excited about putting slipform construction into practice. I have recently cleared a building lot for my cottage on a 300 acre wooded island in Honey Harbour on Georgian Bay.

      As an experienced builder and a "child" of the seventies, I have always taken on any project with a sense of commitment to environment, alternative techniques, and a more holistic approach to the end result.

      I came upon your book in a rather humorous fashion. Many years ago in my first personal building project I spied a box of books in my rural landfill. These books were a general selection of great material all purchased from the Whole Earth Cataloge, also in the box. One of the books was Build Your Own Home by Ken Kern. That book has fascinated me for about fifteen years now, in particular the reference to Flagg and especially the use of the Magdiel form and rubble wall construction. From that knowledge I happened to be surfing looking for Magdiel info and came upon your book.

      I am building a log home and was originally and reluctantly planning on a block foundation. I say reluctantly partly because of the hassles of getting blocks to an island.

      I have a small Kubota backhoe on site and I also have plenty of stone! I feel that a slipform basement of stone is the perfect way for a self-built project. I have sand available and with some hunting I should be able to secure enough aggregate. How consistent does the concrete have to be?

      The rocks that I have on site are more like the rounder type without a definitive flat face. Should I be concerned about this or does it mean more concrete? I suppose if I really looked around I could hand pick some stones with a flat face. Do you know anything about the Magdiel Form, where I can find any information, or whether I need to bother pursuing that avenue? I must say that I enjoy your book very much and feel that with it and my experience I have enough to go ahead and build. I can't wait untill spring!

Yours Truly, Mark

      Thanks for writing. The round rocks will be just fine. You may need a stiffer mortar (less water), so that it will not run down the face of the stones in the forms.

      I usually keep the mortar back from the face quite a bit, then grout it afterwards, but with the rounder rocks you might push the mortar farther between the joints, then avoid chipping too much of it out. A good technique is to pull the forms off 24 hours after a pour and rake over the joints with the back of a hammer to drag off the concrete lumps, smoothing the joints. It won't be as smooth as a grouted joint, but it is quite a bit less work and it will effectively hold the rocks in place.


Thomas J. Elpel

Is slipform stone masonry approved by building codes?

Hi, Tom
      I'm writing to you from Missoula, Montana. I am wondering about your experience--or the experiences of any of your readers--with slipforming and local building codes or the local construction/planning approval process. Are local building officials generally receptive to do-it-yourself slipforming? I'd be glad to receive any advice that you may have on this topic.

Thanks. Carrie

      A slipformed stone wall might best be described as a "reinforced concrete wall with stone facing". That is technically what it is, and describing it that way would help to reduce confusion when dealing with building codes.


Thomas J. Elpel

How can we support the second floor if we are doing two stories in stone?

      I don't plan to bother you at every turn, but I wanted to pass this on to you. Several 'Nay-sayers' in my life recently said things to me like:

      "They're never going to let you do anything like that around here," and
"Well, you can probably get away with something like that in Montana".

      So I was a bit nervous about meeting with the building inspector. To my surprise, he was already familiar with your slipform technique, and had absolutely no problem with it. Of course, why should he? He could sense, I think, that I was nervous, and told me of that what I was proposing was in no way 'crazy'. Then he started to describe other projects he has had to deal with that were much more controversial.

      Anyway, I am curious about how Dani Gruber supported her second floor. My carpenter friend suggests that I imbed treated nailers into the outer wall, but I wonder how much that will affect the insulation factor, as you describe that wood framing would. If there is a better way, I am of course open to it.

Warm Wishes,


      Thanks for writing. Yes, you can imbed treated nailers into the outer wall to attach your header joist and joist hangers to support the second floor. The energy loss through the wood shouldn't be too bad since it would be a relatively small area of the total wall space.

      Dani's house is a bit different, since the second floor is supported directly on top of the stone wall. She has a 9-1/4 inch thick stone wall up to the top of the eight foot beadboard panels. The floor takes up about half the width of the stone wall. Then she did a thin veneer of stone up about another three feet on the remaining width of the stone wall.


Thomas J. Elpel

How can I reduce the cost of the beadboard panels?

Dr. Mr. Elpel,
      I'm a little stunned today, because I have been receiveing phone calls with prices for the EPS panels. I'm shocked at the prices I'm getting which so far are $1.80 to 2.21 a square foot, which is $58 to $70 a 4x8' panel. This means that I'm up to close to $20,000 dollars in foam panels alone. I wasn't expecting this, and it leaves me wondering if the product you and Dani Gruber used was something else. Of course in your video, the scrap panels were free, so that wasn't figured into the final price of your workshop. Any information would be appreciated.



      Yes, I know what you mean about sticker shock. The quotes you received are probably on the mark. Just make sure you are getting quotes for OSB board on one side only. The cost of these beadboard panels ( should approximate the cost of a framed wall with foam insulation sprayed in place. In other words, it will be more expensive than a framed wall insulated with fiberglass, but better quality too. When I look at the process for making these panels it doesn't look like it should be expensive, so I wonder if the cost reflects the patented monopoly on the panels. I also know that our local factory operates at maximum capacity most of the time, so they are keeping quite busy enough without lowering prices. Anyway, if "Necessity is the mother of invention," then perhaps sticker shock is the father.

      I can see several possible routes around the cost problem. First, you might explore the possibility of getting free panels off the factory scrap piles. I don't know how close you are to a factory, but it would be worthwhile to investigate, especially near the peak of the building season when the factory is at maximum production. Just go directly around back and see what's there and ask the people near the pile which ones you can take, or more appropriately, which ones you cannot take, since the workers may be saving a few scraps for small factory projects or their own personal building projects.

      I think there has been some problems in the past with individuals assembling the scraps into buildings, since the panels are structural, while the scraps are not. But there is no problem using the scraps in a slipform wall, since the stonework is the structural part.

      Second, you might look at a more modular approach to construction, to the greatest extent that the codes and building inspector will allow. In other words, build a small structure that looks mostly complete and move into it while you build the rest. Be sure to design the place so that you can easily add on to it. That way you can pay for the new panels as you go, or build in sections as you accumulate scrap panels.

      Third, you might evaluate a variety of insulation systems that could be incorporated into different parts of your house plans. For example, our house (built before the beadboard method) is bermed into the hill on the north and east sides, with inexpesive beadboard insulation (no OSB board) placed against the concrete walls and backfilled to hold it in place. The south side of our house has a large greenhouse with lots of windows, so there is essentially no insulation there. The west end of the house (the family room addition shown in Living Homes) has double stone walls with rigidboard insulation sandwiched in the core. We used mostly urethane board, working with salvaged sheets found for free or damaged sheets bought at a reduced price from the lumber yard. We "welded" the joints together and filled all the holes with expanding foam sealant to insulate that end of the house for next to nothing. While none of these examples may work in your situation, the point is simply that we used three different insulation systems for the walls in one house, but you would never know it, except by my pointing it out.

      In other words, you may need to return to the process of integrated design. Add the element of sticker shock into your criteria at the beginning of the process and design the house with the flexibility for modular step-by-step construction with the possibility of several creative approaches to insulation. That may not be the answer you are hoping for, and I really wish I could give you a magic formula so you could buy the new R-Control panels at 75% off, but that's just the way it is. Let sticker shock become the father of innovation and see what you can come up with.


Thomas J. Elpel

Hello Mr. Elpel,
      I found some things out about polystyrene panels that I thought might be useful to your readers: After getting a 'best price' of $57.00 per panel, I went into a bit of a depression. That price was going to put me too far over my budget, and I started to question whether or not I would be able to go on as planned. In that mood I called Derrick. I had been given his number by one foam place, but had not been able to reach him, and I had in fact given up on him, since I have discovered that in the field of construction, there are people who just don't call you back, and leave you waiting for nothing. Most of us don't mind waiting for something--as long as we know it will come eventually, but waiting on people who may never call you back is very frustrating.

      Anyway, I did reach him at last, and he was at home and fortunately, in a 'gabby' mood. I explained my situation and my feeling that my plan might be coming to an end soon. His response was "Mark, these people aren't listening to you, they are trying to sell you structural panels. These panels would be the walls. You just need them to be a straight edge and then to be insulation." He went on to describe the various densities of foam for assorted purposes, and said that I could use what is called '1 pound' foam, which they recycle out of what would otherwise be their scrap.

Check out the stone house built by Mark Rehl!
      The bottom line is that I will be buying 130 panels that are 9' x 4' without the OSB for $22.00 ea. This is $71.00 more for the extended length (after you add what it would have been to buy the extra panels instead), but I think it will be worth it not to have to cut 130 1x4 pieces of foam/OSB. The 4x8s will be $19.00 each, plus tax.

      I will have to glue the OSB to the panels myself. The company gave me a sample of the product so that I could experiment with the gluing. They are very secretive about their gluing process, and would not advise me as to what type of glue to use, other than to say that petrochemical substances would eat the EPS. I went to the local Home Depot where they steered me to 'Liquid Nails' for foam. I took a tube (caulk-gun style) home and it worked. The drying time was a whole day, even though it said 4 hours on the tube. After about 6 hours, it was still goopy-wet. I set an old glass 'slider-door' on top for weight, and the next day it was solid. I used 7/16" OSB, because it is only 1/16" thinner than 1/2" and that is what the foam manufacturer was using. Also it's less expensive. When I finished gluing the panel, it seemed to want to stand on end, and it was very sturdy. The R value of the panel is 22.9, so with the OSB it is at least 23.

      I was concerned about the cost of the glue because I paid $2.14 for the tube, and used a good deal of it on one panel. Since then I have found 'construction adhesive' in the paint area of a "Lowes". I have not been able to try it because I have only the one panel, but I'm hopeful, since it says on the can that it can be used for EPS. If this proves to be a good product, I may try to get it in 5 gallon pails.

      The OSB is $6.89 plus tax per 4x8 panel, and I will need more of it for the walls, since I will have to cut the extra 1 foot. This is still expensive, but for me it is at least do-able.

A thousand thanks more,


      Sounds like you found a good solution to the cost problem. Congrats on the thrifty thinking. I do have some minor concerns about the long-term durability of the glue... in other words, is the OSB going to be at risk of peeling away from the beadboard after a number of years? The R-Control panels are glued together in a large press, so there is a lot of weight to firmly press the OSB to the beadboard. Personally, I think you will be fine with your approach, especially since the panels will be locked in place by everything else-such as the interior walls that butt against it, the sheetrock that covers it, and the sheetrock on the ceiling material that butts up against it.

      However, for extra insurance, you might think about some ways to permanently tie the OSB through the beadboard to the concrete. For example, if you are using wire ties for the formwork the way it is demonstrated in the video, then you might leave some or all of the wire ties in place. Sheetrock would easily lay right over small diameter wires (like tie wire), or you might look at making a shallow groove in the OSB for thicker wires. I would recommend a medium-sized wire, since tie wire isn't very strong, and could also rust through easily where it enters the concrete. The thicker, stiff wire I showed for doing a concrete pour in the video would be excessive for stonework and wouldn't lay flat, so look for something in between.


Thomas J. Elpel

How should the holes be spaced to anchor beadboard panels to the concrete?

Dear Mr. Elpel,
      My question today is about the holes you put in the panels to secure them to the masonry. Do you have a reccomondation as to the number and spacing of these holes? I would think there would be more stress at the top of the panels, so you would want more holes there, but I'm not sure. Since each hole takes away a little insulation, I want to be smart about it. Also I am thinking that I could make up a pattern to turn the hole drilling into an assembly line process, using a 'spare' piece of OSB with the 'drilling pattern' already drilled into it.


      I don't know what the best spacing would be, but I think you have the right idea to predrill the holes in an assembly-line process. It is too easy to forget about it later on. The loss in R-value should be minimal, so I wouldn't worry about that part too much. I might put three holes across the panels horizontally, such that two were about six inches from the edges and the third was in the middle (sixteen inches apart from the others). Vertically, I might do a similar pattern, starting about six inches from the edge and spacing the rest sixteen inches apart. This number of holes might be overkill, but you can be certain the panel won't come off the wall. While you are doing some assembly line work, you might also want to predrill the panels for your form wires to go through.


Thomas J. Elpel

How should I build the window frames in a slipform wall?

Dear Mr. Elpel,
      I'm still a little iffy on how my windows are going to work. Dani Gruber's article said that your book was very clear on this point. So I went back and re-read that part. I don't claim to be as intelligent as Dani, but I still don't feel that I have a clear picture. It occurs to me that there are pictures of Dani's house in your book 'Living Homes', so she must have read another book by you, or at least a different edition, and maybe there is more info on the window process there. I'm sure I will figure it out eventually, but I'll take any information I can get.

      Building, I have learned, can be an emotional rollercoaster, at least for the beginner, but I'm enjoying it on some level. I really thought I'd be 'slip-forming' by now, and if I had it to do over again, I would start several months earlier. But I'd still be doing it.



      For the window framing, we've used 2 x lumber in the past, but I really liked the method we used in the video, where we built the frames out of scrap beadboard panels. In fact, you could recycle the scraps cut out from the window and door openings to make the window and door framing.

      The one thing I might do different on a house would be to push the beadboard panels all the way to the outside of the wall and stucco the edge to make a six-inch wide "picture frame" around each window, instead of bringing the stonework all the way in as we did for the workshop in the video. Optionally, the beadboard could be trimmed down to make a more narrow frame.


Thomas J. Elpel

How much concrete and stone goes into a slipform stone wall?

Hello Thomas,

      I purchased you book sometime back and enjoy reading it over and over again. My wife Cozy and I plan on building a home in the near future. I do have a question though. The question is, in a 10 foot square section of a home how many stones have you used on average? And how much concrete have you used on average within that 10 foot square section?

      Please note I plan on building our home having stone on the inside and outside. My concern is the cost of concrete these days and the amount of concrete that I will need to construct the home. As I suspect, you will agree that it is difficult to determine the amount of concrete when not knowing the exact sizes of each stone. To date, my plans are to have a 25 inch wall. This includes the 6 inch (5 1/2) beadboard, stone on each side, rebar and concrete. I believe you mentioned having a 9 inch spacer on each side. If so, that would put me at approximately 25 inches total width of wall? Hence, I think you can see the dilema in not knowing that amount of concrete needed and it's cost.

      Any help would be greatly appreciated.




      Thanks for writing. Our double stone walls with insulation are typically about 7-1/2 inches thick for each stone wall, plus the insulation. A normal 9 inch wall is typically half stone, half concrete. The 7-1/2 inch walls are probably 2/3 stone, 1/3 concrete, with rebar pushed through the insulation to connect the two walls. I'm not sure how much cement that works out to. However, if you are close to a source of fly-ash, a waste product from coal-fired power plants, you can substitute about 30% fly-ash for cement. The fly-ash is a waste product with cement-like properties, often disposed of in landfills. I found a local source for fly-ash at 2/3 the the cost of cement, so there was a small saving there. You might also consider doing a double stone wall up to the windows, then switching over to strawbale construction for the rest, which would be faster and cheaper. At least keep your plans flexible, so you can switch over if you decide to.

      In regards to stone-size, I like to use the largest rocks as I can, that are +/- half the thickness of a 9 inch wall or 2/3 the thickness of a 7-1/2 inch wall. However, we did build one house with mostly baseball- to softball-sized rocks. That added a lot of extra work, though it looks good.

      I hope this helps. Be sure to take lots of pictures of your project, and good luck with it.


Thomas J. Elpel

Is full-strength concrete required for slipform stone masonry?

Greetings, Tom!
      I imagine you get your share of questions due to your wonderful book, which is splayed out on my desk alongside the Schwenkes, Nearings, Kohlers, and Stanleys of the slip-form world. I'm in the process of building an "embiggened" version Joe Kohler's beautiful cape over here in Worcester, Vermont, and have got my poor brain hung up on the question of concrete. I've been using Kohler's "mortarcrete" recipe (very similar to the 5:1 recipe recommended in your book) for the small bit of below-grade work I've done to date - less than one full form around the whole perimeter of the house, so far - and I've been reading and re-reading my whole slip-form collection at every step, matching the actual DOING with the reading. Here's where I'm stuck:

      The early folks to the technique, Flagg and the Nearings (I've left my copy of Schwenke at work) advocate a much lower ratio of cement to aggregate than you and your more modern confederates, with Flagg using a 15:1 ratio and the nearings using a 9:1 ratio. Given that:

1) Their buildings are still in use, and;
2) A bag of cement is equal in value to a truckload of aggregate,

I can't help but want to stretch things out a bit. Could you give me any info that will set me right before I make a mistake?

Many grateful thanks,

-Rick Young

      Sounds like you are started on a great adventure! The 5:1 recipe we use is approximately the industry standard for quality concrete. (We use either 3 sand, 2 gravel, and 1 cement or 2.5 sand, 2.5 gravel, and 1 cement.) Ideally, your concrete should be made up of big aggregate, with little aggregate and sand filling the spaces between the gravel, and cement coating and filling spaces between those particles. The better the quality of the concrete the stronger and the tighter (more impervious to moisture) it will be. Keep in mind that sand has much more surface area than gravel. Using a higher proportion of sand implies calling for more cement.

      Also keep in mind that the mix is really only half of the strength. Getting the mortar to settle in nicely, without honeycombing, is equally important to making strong concrete. That can be a challenge in slipforming. Be sure to agitate the mortar thoroughly with a rubber glove as you pour it.

      I think it is important to shoot for good quality concrete, recognizing that real world circumstances dictate that you will probably end up with something less strong, but strong enough. My early stonework was probably closer to 9:1. However, we are in a seismically active area, being not far from our neighborhood supervolcano, a.k.a. Yellowstone National Park. These days, I shoot for the 5:1 ratio, preferably substituting fly ash for some of the cement, at least on the bigger projects.

      You might research the feasibility of getting a discount if you order enough cement for your entire project (or slightly less), and have it shipped in on pallets. Optionally, be sure to ask about broken bags at building supply stores that sell cement. They may sell those bags for a little less. Also check Habitat for Humanity Restores, or other secondhand building supply stores, for a possible discount on cement.

      I recently built a cinderblock garden bed using free cement, in this case, the leftovers from a neighbor who build a house many, many years ago. Much of the cement was clumpy, but there was enough decent cement left that I was able to use it. I did double the quantity on some of the batches, where the quality was marginal.

      You might also research lime-based cements, which absorb carbon dioxide from the air and get harder very slowly, over decades or centuries. I'm not sure if you could substitute the cheaper lime for some of the cement, to get a product that would harden quickly and continue to harden over the long-haul, but it might be worth investigating.

      I hope this helps! Please keep me posted on your progress.


Thomas J. Elpel

Can we slipform a veneer of stone against our house upon an angle bracket?

      I recently purchased your Living Homes book and have found that I agree with nearly all of the things you say. ( I would say all, but I don't agree with anyone that much) My husband (he is much more conventional than I am) and I are planning to build a new house this year. I have managed to talk him into building to last, instead of putting a double-wide on a basement.

      We are planning to use the foam concrete forms for the basement and walls, he thinks that vinyl siding is the way to go, but I would like to use field stone on the outside of the walls.

      My question is this; could we use the slipform method and tie into the existing wall with angle brackets? I think a stone house would look absolutely wonderful, and I don't want to mess with replacing the siding that blows off. Please let me know what you think, and thank you for taking the time to answer.


      The foam concrete forms, though pricey, are a really nice way to go, and quite energy efficient. Yes, you can bolt a heavy piece of angle iron to the wall and go up on top of that with a veneer of stonework. You don't need forms for it, just some flat rocks 3 to 4 inches thick, plus some mortar, a trowel, and a little patience. It is not what I would call real stonework since it is only a veneer attached to the wall. Realistically, the vinyl siding should hold up just as well as the veneer. Not that I would choose vinyl siding for any of my projects, but yes, it is pretty good stuff, and you would be attaching it to a great wall system. Sorry, that probably isn't what you want to hear!

      I guess my thought is that when you choose any one element (foam concrete forms and a basement), then it limits your choices for the next element. Hence the vinyl siding might be the better choice than attaching a veneer of stone. In other words, I wouldn't close the door just yet on other approaches besides the foam forms. Try to come at it a bit more holistically, so that you are choosing an entire package, rather than choosing the first step and forcing all subsequent decisions to fit that path. I hope that makes some sense.

      If you keep the foam forms, then you might consider a blend of stonework and vinyl. For example, stonework up to the bottom of the first story windows would give the house a nice solid and natural look, while the vinyl the rest of the way up would make the house entirely conventional so that it would fit into any neighborhood.

      I hope this helps... please let me know what you come up with.


Thomas J. Elpel

How do I put wiring in a slipform stone wall?

HI Tom-
      I purchased your Living Homes book and the accompanying video. THANKS! I have went through both of them and appreciate the detail and commonsense way in which you share your knowledge. I will be studying them both this winter to prepare for building in the spring.

      I have a question: I want to put the electricity in the walls, but I'm not sure how to accomplish this. Do you use PVC pipe and put the boxes in where you design the outlets to be? I have read your excerpts from Dani Gruber. What did she do for electricity and plumbing? An architect out east, built a slipform stone home with his wife, but put a chase in the floor for his plumbing and electrical. I'm not sure if I would like the look of that, and I'm not sure how to do it, since I don't have your step by step method!!!! He also uses a different iteration of forms that you don't have to keep taking down and moving. Do you have any knowledge of this method?

      I am a 48 year old woman that has dreamed and planned for 4 years to build a passive/active solar home and next year my dream will be coming true! Thanks for your excellent book and video.



      Thanks for writing. Yes, you can place grey pvc conduit and boxes in the wall as you go up. There are a few things to consider here:

      1) It can be difficult to think about the wiring while you are focussed on the stone masonry, especially if you are a beginning builder.

      2) By the time you get the walls up and are ready to do the wiring, you may rethink where specifically you want the outlets and switches. (We had a limited amount of conduit in our walls, and ultimately mortared in the boxes on most of it.)

      3) Most or all of the stonework in a stone house is usually on the outside of the house, so the wiring can be routed through insulated walls on the inside. (That is what Dani Gruber did.) If you have a large amount of stonework on the inside, then you have to be more creative in routing your wires.

      Plumbing is somewhat of a different question, and it sounds like the architect you are referring to must have poured a masonry slab and used the chase to allow future access. You might consider another approach: permanently imbed the drainpipes in the floor, and route your PEX potable water through polypipe, so that you would have the option of pulling out and replacing the PEX pipe if it became necessary 100 years from now.

      As for the alternative slipform method the architect used, I'm not familiar with it, but I would be pleased to learn about it if you can get some additional information.

      Good luck with your project, and please keep me informed.


Thomas J. Elpel

What can you tell me about traditional Irish stone masonry?

Dear Thomas,
      First I would like to thank you regarding your philophy, building knowlege, and LOVE of stone masonry.

      My sister has given me land in Hillsdale, New York, next to her and I would like to build a traditional Irish Stone Cottage/farm house. My nephew Will is to be the Contractor and I will assist (he went to a Traditional Building School/VocTech) as well as a fine crew of young builders he went to school with.

      In Ireland my family has a working sheep farm (400 acres on the ocean in Goleen, County Cork) which is also an old Irish farm compound. Meaning, once upon a time a couple buillt a small stone house and then kept adding other sections/houses that are connected, as well as shelter for livestock and then surrounding or connecting stone walls. I miss living in an Irish stone home where the walls are so thick that you feel like you live in a loaf of bread. Well, enough of my home sickness and on to more practical matters.

      Here I am, with land and the luck that my sister and brother-in-law have 80 acres. Now, I know for a fact that nearly all the folks who built stone homes in Ireland did not have money, contractors, or Architects! Talk about limited budget, take a look at what remains of the Scalpeens from The Famine!

      I will be investigating the slipform method but would like to know if you might suggest any books that cover Traditional Irish Stone masonry methods for home building.

      I also will hopefully be having my roof Thatched by Patrick McGee(Master Thatcher from Ireland here in the States.) A finely thatched roof has a 75 year life span, is not flammable and just the most beautiful roof a person could have. Anyway, thanks for putting up my tome and I hope we can be in contact. I thank you in advance for answering my query.

Warmest Regards, Phoebe

      I would guess that traditional Irish Stone Masonry was simply stacked very carefully, using shims to fill the voids and level the stones. There was probably a crude mortar between the stones, used more to block air flow through the walls than for strength. The strength of the wall would rest entirely in the skill of laying up the stonework. In other words, I don't really know anything about traditional Irish stone masonry, except that if you needed a house and had rocks but no money, that would be the logical way to proceed.

      Insulation in any northern climate would be necessary to minimize or eliminate heating costs. One technique you might consider would be to build the house out of insulation panels, as we did for the little workshop we built, then to rock up the outside without forms. The insulation panels would provide backing for the one side of the wall, while serving as a nice straight guide for the rockwork. You would be able to measure off the insulation panels when placing stones to keep the stonework nice and even. The end effect would be more of a brick-layered effect.

      Notice how the stonework on that page looks different in that project than in the slipformed walls pictured on the same page. It is a stronger way of doing stonework and uses less concrete. You could still include reinforcing bar too. I realized when building our workshop that with the insulation panels for backing, this formless technique might be just as fast as the slipform method we used. I hope to try it out on a small project sometime soon.


Thomas J. Elpel

Is there a way to get that "wet-look" to bring out the colors in the stones?

      I was hoping you could answer a question of mine. We had a natural river stone fireplace built in our house. Is there any way to get that "wet-look" in the stones to bring out that colour that is so obvious when wet?

Thanks for your time. Andre

      I've wondered the same thing. We use an acrylic-based floor sealer on our tile floors, which really brings out the shine, so it seems like it should do the same on stonework. There are many different brand names with different formulas, but all seem to be acrylic-based. (The tile sealer looks like milk when you pour it out then dries clear.) These products are especially intended for porous tiles like terra cotta.

      I tried using an acrylic floor finish on some stonework but it turned out disappointingly dull and filmy. So, to better answer your question, I called my local brick, block and tile shop to ask for advice. They suggested the same thing: use an acrylic floor sealer (Brickyards use brand names and may not know what's inside the bottle, but they will describe it as a "water-based sealer.") So that didn't really answer the question. I guess you could try applying some acrylic-based floor finish to a small area of stonework that is not easily visible. I would leave it for a few months to see if it dulls out over time. If it looks shiny and stays shiny, then you could do the whole fireplace.

      Otherwise, I am guessing that a polyurethane-based product might be more effective at creating and keeping the wet look. I don't have much firsthand experience with polyurethane, but the woodwork I have seen treated that way seems to stay beautiful forever. So you might look for a clear polyurethane that could be used on stone or masonry. And again, test a small area out-of-sight before committing to doing the whole fireplace that way.

Good Luck!


Thomas J. Elpel

Is it feasible to build a three-tiered tower with slipform stone masonry?

Dear Thomas,
      I have recently purchased your video and book on slipform masonry. I also have acquired some land in the Mount Shasta area, California. I have dreamt about building a mountain retreat with an old castle style . . . cheaply. Slipform sounds great and the project of a lifetime!

      If you have time, a quick question. I am going to (would like to) build a small home, but much like a tower. I am attaching a picture in a word file of what I am thinking about. I will consult an achitect, and an engineer for feasibility but before I do that, I would like to know your opinion . . . can this be done with slipform?

      Thank you for your thoughts

-Oliver Davidian

      Thanks for writing and sharing a little about your Dream. Unfortunately, there is one serious obstacle to overcome to make this Dream a reality: there doesn't seem to be anything supporting the walls of the upper floors. Even if the roof of the lower levels were poured of concrete and heavily reinforced, you cannot just float the walls of the upper levels out on top of the concrete slab. The weight is immense. The upper walls must be supported all the way to the ground. Of course, the other problem is that if you brought the walls all the way down inside, then there would be no open space left inside the lower levels. Sorry I don't have better news!


Thomas J. Elpel

Would it be affordable to build a stone castle?

      I came across your site just after poking through many other useless ones and thought maybe you would be the one to help me. I don't know if there's a word to describe myself, but, I'm not one for the old box-style, typical commerical homes with 2x4's and aluminum siding. I like big spaces, large rooms and such that I can explore and such. I know I'd never be a millionare so to get a big mansion in the richy part of town would be out of the question. However, I have always wondered if I could take natural materials around me and build my own monstrosty somewhere private.

      I've always been partial to medieval history... Castles with towers and drawbridges and such. I live on the east coast of Newfoundland Canada just outside of St. John's, and if you know what it's like here, you'd know that it's sorta close to Ireland or Scotland; geography wise; with endless Rocky cliffs and such stretching along the coast.

      What I want to do is probably outragous.. But, if I could purchase some parcel of land on top of a coastal cliff, could I afford the cost of building a substantually large Stone stucture castle?.. Do these projects get costly. Like into the $500,000 range?

      Sorry if this is so vague, I'm writing this at a very late time. I have so many ideas and questions floating around in my head, and I really want to do this project with the least amount of money involved.. I really don't want to hire labours either. I'd rather build on my own, even if it would take the time to study masonry and bricklaying and whatever other course would need to be taking. And if you know what weather is like here in Newfoundland..

      Can you tell me if building a structure like this can really last a long time here?


      Sounds ambitious! Our early house plans looked more like a small castle, but it evolved to become much more house-like by the time we started building.

      Yes, you can build your own castle, although from your description it sounds like a lifetime project. If properly built it, would certainly last for centuries and would likely become a famous landmark, "Cory's Castle".

      Cost is mostly a function of design. You can make a structure about as cheap or expensive as you want it to be. That is one of the key points in my book Living Homes, designing a building to meet your criteria for cost and energy efficiency.

      I hope this helps!


Thomas J. Elpel

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