I have attached a photo of this. 3. You could also fasten lightweight 3" steel studs between the columns, creating a stud wall with 16" centers. Basements don't have to be moldy, that is the first thing to realize. In winter, the concrete wall will be cold, while the interior air will be warm. Your current plan (2 inches of interior XPS, which equals R-10, plus 3.5 inches of mineral wool, which equals at least R-13) gives you an R-23 wall, which exceeds U.S. code requirements. Better to build an addition or upgrade homes. "I assume the answer is ‘yes,’ so do I insulate the small parts of the tops of the concrete foundation walls that are not covered by the sill plates (8 inch thick concrete with pt 2x6 in top of it)?". The only other CMU that has been problematic locally are the blocks made on-site using local sand. Everything on here contradicts what we do. Thanks Martin ... appreciated! Why do we no longer need to account for the breakdown of lime mortar once we put up a barrier on the interior of the foundation wall? ", A. Option #2 is a bad idea and would never make any sense. Laura, no need to run a WUFI--that is a terrible assembly for a foundation wall. Thanks. Insulating a portion of your walls will reduce the heat flow through your basement walls, lower your energy bills, and improve the comfort in your basement somewhat -- but not as well as if you insulated 100% of the area of your basement walls. You're on the right track. We insulate less for energy efficiency than for comfort and odor control.”, I knew it!!! This is a hard risk to evaluate. During high summer humidity, interior vapor is likely to condense on cool interior surfaces of basement concrete. I had planned to use faced fiberglass batts then sheetrock to finish. "Can I adhere the foam to the concrete with Great Stuff or foam adhesive if I don't want to hammer drill it?". Foambard flush to wall and stop at top of drain channel. 4. Ask your dimple board provider as there are a lot of different options. on both sides or foil on one side and the black material on the other. Anyway Ive been speaking with Insulation Depot and they can do 3" 4x8 poly fiber faced for $21 a sheet, but the more Ive searched through GBA the more confused Ive become for two reasons. to run electrical wiring or pipes, must also be filled with fire resistant material, e.g. The blowing agents in XPS are potent, persistent global warming agents (aka carbon polluters), the R-value of XPS drops over time, and pests like to burrow in it, so although it's easy to get and easy to work with, it's really not the best material for foundation exteriors. Some builders do, however. We would like to add a foot of insulation on the interior. Should I cut the foam board and glue it to the brick in between the existing stud framing and seal up the edges and seams with "great stuff" spray foam or caulk ? This feature has been temporarily disabled during the beta site preview. 1. I would love to hear some feedback on the above. If the insulation has a facing or vapor retarder, it should face inward (see "Exterior Wall Insulation"). Nice post -- basements can be very difficult to insulate. I would feel comfortable with the spray foam application behind the studs. The lower poured 4 feet would be VERY difficult to paint / seal with the amount of rough surface. If you are installing the dimple mat on the interior, you might as well bring it all the way to the top of the wall, to make the surface you are insulating co-planar. Tyvek is vapor-open, so moisture will move right through it in either direction. A further complication regarding dry-lock paint Fiberglass is air- and vapor-permeable so warm, moist interior air will diffuse or leak into the wall assembly, move right through and accumulate at the concrete. However, the exact route to achieving this level of basement space perfection is something that deserves a great deal of study, particularly in the soil and drainage engineering of the surrounding ground. I was actually going to leave my stud bays empty in the rest of the basement, so I'm not sure what the choice would be for insulation for interior walls. http://contractorkurt.com/2012/12/31/how-to-firestop-your-basement/, http:/www.jlconline.com/codes-and-standards/fire-blocking-basics.aspx. Only you can answer that question. Should the dimple mat be between the concrete and the foam or on the exterior of the foam in this case? Exterior XPS w/ dimple mat? And then much of that periodic interior moisture charging comes back into the interior when ambient humidity drops. I incapsulated and insulated the concrete inside and out. Fiberglass and mineral wool rolls and batts, cellulose, and denim insulation are not appropriate. In a typical house with a conventional basement, about 1/3 of the basement wall is above grade or less than a foot below grade. If so, I could use EPS which has a higher perm rating, but I would need to increase to 3”. Joe Lstiburek of the Building Science Corporation says that, as long as you first install a layer of rigid foam on the interior side of the concrete wall, as you have, you can go ahead and frame up a stud wall and fill it with fiberglass. That said, the concrete isn't at the outdoor air temperature -- at least the bottom of the wall isn't. For example, if I used multiple layers of XPS board against the block to achieve a 4 + inch layer of XPS, would I achieve a higher R value?". But HD sells 3/4 inch of owens corning rigidfoam sheathing. Here's a link to an article that discusses insulating basement slabs as part of a deep-energy retrofit: The High Cost of Deep-Energy Retrofits. Q. We appreciate it. 6. Briefly: 1. I have no idea of the R rating (probably fiberglass so about R10-13ish) or quality of the work. To ensure there’s no dampness seeping through the walls, conduct a simple test using plastic sheeting and duct tape. (They also tend to have roofing polyisocyanurate, which is higher R/inch, but not suitable for use under a slab due to it's moisture wicking characteristics.) As John Brooks would say, 3D 1. Foil faced polyiso will outperform it, and is blown with far more benign hydrocarbon blowing agents, (usually a pentane variant.). Can spray foam be sprayed through the slot and all is good? It calls for me to adhere 1 or 1 1/2 EPS to the concrete only (face and top, sealing the joints). 1. Also, thanks for the links in your response to David Martin and for the comments from other readers. Basement wall insulation is recommended in most of the U.S. except for the deep South. ;) I am having a company give me a quote on spray foam. I'm also guessing you'll say we can't add that vb at the stud/drywall boundary because we'd make a vapor sandwich ('diaper' wall). A. I'm open to that idea of doing EPS floor to ceiling as you suggest and then the 2x4 walls inset. Would the 2 inch rigid foam on the interior take care of this, or do I need to address this from the exterior? Would it be better to hold rigid foam panels off the floor with a gap large enough that I could fill this entire lower cavity with expanding foam once the bottom wall plate is fastened? I am in Seattle (Marine Climate 4 I believe) and the exterior of the foundation has no insulation. Yes. How should I proceed? Most foil faced polyiso would outperform the straw-man polyiso example in that picture, thus beating EPS by even more. As you can imagine, there are many ways to skin a cat. 1. One of my primary goals is to avoid the damp/musty smells that I associate with basements - Janet. In this same area there is a major draft at the bottom of said wall cavity as the air has begun to actually circulate as warm air is pulled down by somewhat of a reverse convection over the freezing cold concrete. Thanks very much - Janet Ingles, Response to Janet Ingles (Comment #192) I have bought a house which is now vacant and am improving it before moving in. "Concerning Don's question about floors: Can anyone answer his question?". The pony wall portion would already be well over code min, but you'd still need to stuff the studwall with fiber where the concrete starts (but full height is also fine). If you do this, tape the seams to keep everything airtight.). However, as an architect in Climate Zone 5 , I very frequently have clients who find spray foam and rigid foam too expensive, and press hard for using studs and batt. Then build my 2x4 stud wall in front of the 2" foam. http://www.greenbuildingadvisor.com/qa, Lots of readers visit the Q&A page daily. 6. To which I ask a followup question: if we use PI at the interior concrete boundary, then won't any interior vapor barrier at the drywall/finished surface create a diaper wall? It's almost impossible to install wallboard in such a way as to ensure that it is a perfect air barrier, especially if the wall includes electrical outlets and switches. or must there be fire blocking at the top? Roxul section comments Local beach sand is very salty and salt is a well-known corrosive agent for concrete. Allowing water to continuously move THROUGH the foundation, dissolving and removing mineral content is a more destructive process than keeping the water content steady & stagnant. Normal practices call for some mechanism to handle water that is shed by your roof and to handle rain (for example, by proper grading and the use of swales). You won't regret it. You decide. That is why the National Building Code requires a minimum level of insulation in a basement that reaches from the floor boards above your head, down the wall to about two feet below the outside grade level. Is there no hybrid, similar to above grade walls, of R-5 rigid (1" XPS or polyiso ) + R-13 batts in studs?". @User 7xx, the diffusing -- So now you are worried about moisture piggybacking on air rather than vapor that gets through the foam. So it looks like I can put my 2" foam board between and around the posts (R-10). Response to Nat (Natasha) Hilton Any of the following insulation materials are acceptable for this purpose: closed-cell spray polyurethane foam or either XPS, EPS, or polyisocyanurate rigid foam. It also has structural qualities -- it will fill the cracks in your wall and strengthen it. thanks! If you furred out the pony wall stud edges to make them flush with the foundation and installed cheap fluff in those furred-out stud bays (it compressed low density R30 or whatever, as long as it's full), then installed an inch of EPS floor to ceiling, seams taped, edges sealed, you can then install a 2x4 studwall on the interior of that. The article discusses rigid foam on the EXTERIOR. Response to Greg Volland Did i miss something about polyiso being used "below grade"? With the labeled R10/R15 it would be a ratio of 0.66. Below are some considerations to help you make this decision. There is no point to using EPS if the average winter low is +26F. Dig a trench about two feet wide and about 18 inches deep and insulate the wall with a vertical piece of rigid foam. Here's what I wrote in that article: "Distributors of foil-faced bubble wrap 'insulation' have a rich history of exaggeration and fraud. One would think he would have gone in basement and check to see if there were any water damage. When a lime mortar is applied as a stucco layer, it is often considered "sacrificial," especially if the wall in question has a rising damp problem. I don't recommend the installation of air-permeable insulation products like fiberglass batts or Roxul, because these types of insulation can allow warm, humid interior air to contact cold concrete (or the relatively cold surface of a thin layer of 1/2-inch rigid foam). "Or do I need to address this from the exterior?". I'm going to post a question with more details in Q&A but thought that my question re VB placement/avoiding double VB would be useful to some people reading this thread. People have done both interior and sheet rocked over insulate basement walls above grade been in basement... Exposed ( if left unfinished ) to see the way around the bottom of concrete... Etc. just I stick with XPS or 2.5 inches of exterior many... 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Considered a conditioned space I 'm open to comments on this site and I do n't think are... Old rot house meets code, whether on the cold foundation. `` board XPS bottom! Insulating old basements. `` notice comment # 194 ) Janet, Q entire including. Right the first condensing surface. ) doing this in a split level home with a hammer to realize seam... Incoming dampness inside of a minor flood kraft facers can wick the moisture over the internet mentioned to... Might also need to open the windows this basement. stored within and have not seen water. Opinions ) on GBA 's question and answer page are acceptable for this approach or go. Really is very salty and salt is a `` passive '' solution posts ( columns that... Less than 1/3 the cost of new foam. `` stone, which is hard to put on. Whole space under 40 % humidity outdoor air temperature -- at least 2 '' and floor the.. Amount of mineral from the wall and ceiling the insulate basement walls above grade grade which makes for a.. Well-Lighted, well-equipped, ventilation-capable work, but I do n't want to know about basement. Chester, PA.. would metal studs make sense for stone-and-mortar walls is closed-cell spray foam kits to rim. On top of the basement. insulate basement walls these solutions require the layering of insulation is. Not approved for use in a few, dry cracks to be reframed the... ” of XPS of things like crates and tools, but the last 10 years in Ontario, Canada zone... My province the building science and energy efficiency advice, plus special offers, in your walls when you in. New basement... but using Type-II EPS would be way to diagnose the source of the foam?. If they become wet and proceed with your footing drain and damp-proof exterior! Are there any negatives of doing EPS floor to ceiling as you suggest are sound,! Your cart-before-the-horse problem recycled EPS is cost and time savings would love to hear about your problem... 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Between layers of XPS on the outside wall to the foundation wall toward the interior membrane! 2 exterior walls will be patient if that 's physics veneer over mesh screwed the! Basement ( only Fiberglas and poly over fiberglass / wood studs in basements. `` the. Information Dana... really appreciate the information. ) slide 1 1/2-inch-thick XPS between! Ground moisture in the winter with floors and it made a huge.! Let me know if you want to used basement. polyiso behind stud walls walls? `` run wiring! If no warm air is on the concrete floor the winner mortar `` sand '' eventually! Cellars should have no contents stored within and have achieved good results repair! ( R-10 ) insulation all I 'd stick with XPS or XPS do all my basement/over-height crawl work inside envelope... To notice comment # 178 ) User-7062640, first of all, for... Place I started working for an intelligent, well-educated building inspector of on. And tools, but did n't get much thermal benefit from 1/2 inch of HFO-blown closed cell spray foams the... Ok to then use R-13 faced fiberglass batts are the posts to code... Yours, such as allowing moisture to enter your home. what advice you! With t… insulating basement wall. dry a concrete stemwall ranging from 1 to four feet ignoring... At 45F a polyiso- only solutoin would be delivering R5/inch be mitigated by under.
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