Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. So once you commit to the cost of some type of foundation, it makes economic sense to add a little more cost and reap the benefit of basement space. Exterior Basement Rigid Foam Attached Garage Detail K.T., Your plan to use XPS on the walls and spray foam on the rim joist area should work fine. My guess is that Siga tapes or 3M tapes will last a long time, as long as they are protected from sunlight. Statement 1 - “In fact, you don’t want to encourage any moisture to enter your home. The interior side sheathing also be tight to the rock wool, with no intermediate air gaps/channels. I never had wall dampness before. It should yield less heat loss for the same foam budget. I'm open to that idea of doing EPS floor to ceiling as you suggest and then the 2x4 walls inset. post polyiso install dampness I have been considering tearing down the inside walls, and addressing any mold issues that may be present. Insulation, Partitions & Walls Concrete foundation walls in finished rooms/areas shall be furred out and insulated with a minimum of R-8 insulation extending down to the basement floor slab on basement walls less than 50% above grade and a minimum of R-13 insulation … From the diagram, it seems as thought the sealer should be completely under the PT board. Does this apply to structural terracotta foundations as well? Due to its ultra-low density and flexural strength, it provides great design and installation flexibility for curved and radius walls. 3. There are three ways to insulate basement walls: From the outside, from the middle of the foundation, and from the inside of the structure. Are there any issues with sandwiching the concrete between 2 non-breathable layers? If you do, you will be introducing more water to soil near your footings, and that's definitely not what you want. This is a hard risk to evaluate. The process to introduce an amendment to one of these codes is cumbersome, taking a minimum of three years. In the US the IRC code prescribes a minimum of R7.5 on the exterior of a 2x4 wall for zone 6, to be able to use standard interior latex paint as the interior side vapor retarder: Doing this work will never be easier than it is now. If adopted, it is often first amended. Here's my opinion: spray foam insulation is good for certain applications, but since most brands of closed-cell spray foam are expensive and use a blowing agent with a high global warming potential, it's best to use other insulation materials if these other materials work well. But if you are aiming for the Passivhaus standard or willing to spend the big bucks required for a deep-energy retrofit, then it may make sense to insulate your existing basement slab. I have one more: with insulation and plywood built up on top of the concrete, what is the likelihood of these drying should the basement flood? Brian Doe's wall foam r-value question Here is the link: "Foam over Platon dimple mat on foundation.". Plenty of people have done it, and if your basement has the conditions I described, fiberglass or mineral wool can work well. Can the Dow Thermax replace the short 1" thick portion around the slab perimeter ... run it continuous from the footing to the top of the poured wall? Copyright© In fact, air flow is the enemy. Control the humidity and temperature and much of the battle is won. Funny thing is my inspector suggested before purchase for prev owner to seal around stairs. I can't answer these questions for you -- your values and budget affect the answer. If water beads up on one side of the polyethylene, it's going to stay there. Here at GBA, we regularly receive questions from readers about the best way to insulate a basement wall. Interior insulation may be applied to these walls but only from the floor above to one foot below grade, no lower on the inside. Thanks for your quick response. Response to Greg Volland Option #2 is a bad idea and would never make any sense. It has a proven track record. "Are there any negatives of doing this, such as allowing moisture to build between layers of XPS?". If so, what thickness of each do you recommend? But HD sells 3/4 inch of owens corning rigidfoam sheathing. or more than 50% below grade. One last question: Because of the 50' house length we will have a 10" concrete wall. Thanks for your insight. Here is the link: Not sure how I'd even do that.. The dimple mat should terminate at grade level. That provides sufficient dew point control for R13 on the above-grade portion of the wall, and is vapor retardent enough to keep ground moisture from destroying the studwall as long as the interior finishes are somewhat vapor open, such as standard interior latex paint on wallboard (and NOT vinyl or foil wallpaper.). Three types of insulation are used on the exterior of basement walls: rigid mineral wool boards, high-density polystyrene (Type IV) and polyurethane/polyisocyanurate boards. Concrete is an excellent conductor. With an older stone-and-mortar wall, it may be necessary to remove loose mortar and add fresh mortar where necessary before insulating. 3) Finally, my stair stringer is about 1/2" from the wall. Can Siga or 3M hold up below grade? With the 2" of foam on the exterior you could put the vapor barrier between the studwall and concrete (rather than on the interior side) and still meet the requirements of the NBC. Thanks Martin for another helpful article and follow-up on basement insulation. Q. I cannot afford spray foam, I only have about 1 1/2 behind studs. There are two ways to do this: either (1) Build a stud wall, with the interior face of the studs aligned so that the studs cover the insulation you have installed around the steel posts -- so that you end up with drywall that is all in one plane, or (2) Build many short sections of stud walls between the posts, with bump-outs around each post. We have insulated the exterior of the concrete foundation with Tar waterproof, and 2-inch XPS. The portion of my crawl that I want to convert to usable space is roughly 8’2 from the 4 inch slab I had poured (got ahead of myself doing that as I only have crushed rock + poly + 4 inches of concrete and didn’t think to put down foam before the pour). Cellulose is also an option for basements but it’s not a product that I’ll cover here. Are you saying that if I furred out those walls to make them flush with the concrete foundation wall (about an inch), I'd have to put "fluff" in that small cavity between the EPS and the R-19? That encyclopedia article has been corrected. Our solutions deliver a layer of continuous insulation around the foundation, protecting your home from moisture intrusion, air infiltration and energy loss. Should I just replace with an xps? Insulating Basement Walls. Michael, I'm assuming using a thicker 2x would accomplish this. Just to be clear, this would all be interior insulation. Now moisture doesn’t condense on cold surfaces in the basement. Finally, would it be ideal to allow the concrete block to dry out for 2-4 weeks before placing the foam board? I would advise you to talk to the former owners, if they can be located, as well as your nearest neighbors. We know it doesn't work because of field experience.". I would like to insulate my new construction house including the basement with 4" of XPS rigid foam on the exterior side. There is no evidence of mold or damp; should I be concerned? I'd appreciate any advice you have. I'd like to use at least 2" minimum (2.5" preferably) if I can find it. A basement can be like an infection that makes the whole house sick. It appears they were dipped in tar first, to limit susceptibility to water from the concrete. If the foam is covered with gypsum drywall, you should be fine. I have a daylight basement which has a concrete stemwall ranging from 1 to four feet high, with 2x6 wood framing above that. "I plan on putting XPS against the interior side of the block and on the top part of the block that juts out, butting the XPS up to the wooden sill. A good portion of the basement wall will be exposed above grade, and for various architectural reasons, we want to see the exposed concrete. This advice applies to those who live in most of New Mexico and most of Alabama, as well as all of Oklahoma, Arkansas, and South Carolina, and anywhere colder than these states. I'm in NY so I think R15 is more then enough for the finished space. Response to Jonathan Teller-Elsberg User-6948667, Climate Zone 4 (except Marine Zone 4): R-10. The climate zone map link is broken. Mike, 2. With the labeled R10/R15 it would be a ratio of 0.66. Then proceed with your plan to box in the plumbing pipes -- and stop worrying. And B.) Again, thank you so much for all of your help and knowledge. Here is a link to an article to advise you on that work: "Insulating rim joists. You're putting R12-ish foam on the exterior side of R36-ish rock wool, for a total R of R-48-ish, or about 25% of the total R being air-impermeable foam. Assuming a 2" projection into the room, an inch of HFO-blown closed cell foam runs about R7. A. Without any mineral wool, the interior face of the rigid foam will be at the temperature of the interior air (or close to it). I'm not turning up much in a search, but is something like Superseal what I should be looking for? If needed: Insulate 2x4 walls with fiberglass roll/batts (thinking R-13 / Faced). You'll get more responses to your questions if you post them on GBA's Q&A page. "Would I benefit by layering XPS board? Note: I have already insulated the 2x6 wall cavities that are on top of the foundation wall with R-19 faced fiberglass batts (I did this before I found your website!). heavily insulating basement wall Response to Mark Fredericks From the floor joist halfway down the poured concrete basement wall there is fibreglass insulation with vapour barrier. It would prevent moisture in the concrete from entering the air of the living space. • Provide the recommended level of insulation under floors above unheated spaces, around walls in a heated basement or unventilated crawl space, and on the edges of slabs-on- grade. The rest of the basement is finished with regular drywall over poly/wood studs and fiberglass against the concrete. See attached revised sketch. See my reply above (comment #38). 1) Should I bother to insulate the cavities in the existing 2x6 pony walls? First, can you tell us your name? Or...if we didn't install the interior furring until the rim joist was foamed, perhaps the larger resulting gap would be sufficient to foam rim joist. "Since the mineral wool is only 3.5 inches thick but the wall cavity would be 4.5 to 5.5 inches thick in some areas, would it be best if I put the mineral wool against the R-10 XPS (which is against the cement wall) which would leave an inch or two gap of air between the sheetrock and the mineral wool - or should I situate the insulation against the back of the sheet rock and leave a gap of air between the mineral wool and the XPS foam?". Alpha, Photo: courtesy of Ben Rumery. There is a lot of confusion out there. For more on these principles, see Combining Exterior Rigid Foam With Fluffy Insulation. Is it better to the concrete foundation bare there and somehow insulate just the interior mechanical room walls? Makes me wish I had a basement. Kathy, 2) The bubble roll looks to be (very) slightly less expensive than Ice & Water Shield and, I'm confident in guessing, much less expensive than the dimple mat. You'll have to find another contractor if that's the way you want to proceed.". 3. If you can't afford to do that, you can try to slide 1 1/2-inch-thick XPS insulation between the concrete and the studs. "Everything I read on here is suggesting this method [fiberglass insulation with interior polyethylene] is not a good process. Your article seems to point to one flaw in this plan, it doesn't seem to address our wet walls. However, there is no easy way to diagnose the source of the moisture over the internet. Since multiple layers of foam with staggered seams are a good idea anyway, it seems logical to install less insulation on the lower parts of the wall and more on the upper parts (for example, 2" on the bottom 1/3, 3" on the middle 1/3, and 4" on the top 1/3). 4. Does this make sense to anyone? 2. A dimple mat is desirable but not required. Good summary by the way. 4. Hello Martin. When you are combining an air-impermeable layer of foam insulation on the cold side of the assembly with an air-permeable layer of insulation on the warm side of the assembly, there is risk of moisture accumulation if the foam layer is too thin (or the fluffy layer is too thick). Most foil faced polyiso would outperform the straw-man polyiso example in that picture, thus beating EPS by even more. Closed-cell spray polyurethane foam is a vapor barrier, air barrier, and a barrier to liquid water. Dig a trench about two feet wide and about 18 inches deep and insulate the wall with a vertical piece of rigid foam. The dimple mat should extend down to the crushed stone layer under the rat slab so that any water that trickles down the wall will have free access to the crushed stone layer. Would this allow sufficient air flow to prevent mold growth? This is something I am considering in a house with a poured concrete basement with 8' walls and grade at 6'. The only type of insulation that makes sense for stone-and-mortar walls is closed-cell spray polyurethane foam.". That is a tremendous waste of resources. ", The third sentence contradicts the first two, and the label on the can. I can easily touch and chip away excess mortar. Nitch, Regarding question 1, there are a bunch of 'trim' options designed to direct water from a dimple board install down below the floor slab. "It seems to me that a single layer of poly directly against the concrete would keep exterior moisture away from the studs and fiberglass.". One more comment on frozen soils and foundation walls: in New England, many barns have basements. The R5 /inch foam is XPS, only warranteed to be R4.5/inch, and over decades will drop to R4.2/inch. A. I live in NH and my 100 year old basement is stone. A. I understand the logic of these methods and am totally on board with NO fiberglass batt in a basement. Although foil-faced bubble wrap has an R-value of about 1 or perhaps 2, several manufacturers have falsely claimed R-values ranging from 5 to 10. I appreciate it. Two items I would like to add to the pros column of exterior insulation. I wrote: "Can I insulate on the interior with fiberglass batts, mineral wool batts, or cellulose? I can not insulate from the outside above grade as the design of the home wouldn't allow for it. Building codes in much of Canada (and in many areas of the U.S.) are about 20 years behind the times when it comes to building science knowledge. to run electrical wiring or pipes, must also be filled with fire resistant material, e.g. 4. I am using 1.5"x3.5" SPF wood studs, fastened with tapcom concrete A. Retrofit A. I agree. "First, is the standard pink fluffy stuff I see in Home Depot the way to go for the above grade portion? Response to Mike Wall Most of the steps you suggest are sound. If there are any signs of water entry, go with Option #1. b. Not sure how I'd even do that. Q. What type of sealer would you recommend? Nope, not quite too late! This is where I get into so many conflicting views.. One guy suggests that I use the same 3" roxul (R15) AFB and pin it against the concrete (not the roxul comfortboards, then have my contractor frame the walls, (no insulation in between the frame sections) then just drywall and a primer that will act as the vapor barrier. No article can explain everything; the topic of this article is "How to Insulate a Basement Wall." No, I've never used the product. Any frame walls in the basement (as with a "walk-out" basement above ground level) should be insulated with fiberglass batts installed between the studs. "I have seen a few videos on YouTube of basement CMU walls being mushy and crumbling by being tapped with a hammer. My issue here is how do I insulate this basement. You can't install carpeting directly over a basement slab, even if you include a carpet pad, because of the risk of summertime condensation on the cold concrete. 3M Fire Barrier sealant. Either install tile flooring or vinyl flooring, or install a layer of rigid foam, followed by OSB or plywood subflooring and carpet. Joell, When and Where to Insulate. 5. My biggest concern is the odor and or safety of it. See detail attached. A typical Froth-Pack nozzle is shown below. 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? Not only that, but the negative effects of the average basement space can spill into the highly perfected aboveground space and drag its quality down. Q. How you deal with it depends on the depth of the ledge. Leave the floor above it uninsulated, vapor-seal the ground below with polyethylene and a thin concrete slab, insulate the walls with a foam-based insulation (such as 4 in. According to a report published by the U.S. Department of Energy, the annual savings attributable to R-20 basement insulation in a 1,500-square-foot home ranged from $280 per year in Washington, DC to $390 per year in Buffalo, New York, assuming that natural gas costs $0.72/therm. I avoid foam whenever possible but I won't design something that has a strong chance of turning into mold factory. Now this is all against concrete walls. It is natural for the mortar to slough off over time, but it seems to be happening more rapidly on the covered walls than on the exposed ones. 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. 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. ?Check for basement interior features that can make the project more difficult, such as uneven walls, cracks, leaks, dampness, or bulges. Q. Are all closed cell spray foams the same product? Should I cut out another R-10 XPS panel that is 16" wide to fit inside the 2x4 and seal that up against the existing R-10 XPS that was already installed against the wall? However, a more thoughtful response would explain that fiberglass batts and Roxul batts contain air. Whichever one I use do I need a plastic over the studs and behind the drywall. A. Old DIY articles suggested a poly sheet on the concrete followed by 2x4 sleepers with the voids filled with foam and the whole thing covered with 3/4" plywood. is poly always a problem? Chuck, Also, I do notice near the walkout section of the basement, there is frost on the concrete in the winter. William, Installing a Hybrid Insulation of Rigid Foam and Fiberglass Frame the wall with wood. So cost is not a great factor (just the boards, maybe $400?). It is true that closed cell foam would act as a vapor barrier, so in terms of the foam sheet alone, a poly vapor barrier would be redundant. This would be the "cut-and-cobble" method, correct? You can also use EPS foam sheets, blocks for insulating your property. Ok, thank you very much. Then a stud wall stuffed with fiberglass. Jump to Latest Follow 1 - 7 of 7 Posts. I have asthma and a general heightened concern regarding the quality of air I'm breathing. I've designed and built homes with and without basement insulation in my builder days, and there are no comparisons on the comfort side, even though the ROI may not be there. My wife and I had been planning to simply put up drywall, but reading your posts has lead me to believe that this would be a very bad idea. No, it wouldn't be pointless. You decide. For more information on sealing basement walls on the interior, see these articles: "Wingnut Real-World Testing of Basement Waterproofing", Q. "Painted wallboard inside would serve as an air barrier that would minimize the amount of interior moisture coming in contact with the potentially cold poly, and it would permit it to dry to the inside. If you want your stairs to be safe and have consistent riser heights -- then yes. I cannot see how it could cause harm, and I do see a role for it. Mark Fredericks, don't Is this not better than batts in contact with the concrete? The first task was to install rigid foam in the rim joists - expanded polystyrene sealed with Fill & Seal and caulk. For more information on retrofitting rigid foam above an existing slab, see these links: Fine Homebuilding: The Stay-Dry, No-Mold Finished Basement, Fine Homebuilding Q&A: Finishing a basement floor, GBA Q&A: Basement floor insulation retrofit. Do the batts become less effective? Sorry for the delay; I was on vacation. Ok so foil faced, is that the way I have to go, and then there is the "which way does the foil face" question Im scratching my head over as well. headers, on top of the rigid board XPS. The foundation still needs to be waterproofed and drained properly, with the surface appropriately graded to slope away from the building. The main reason I ask is the framing is not true 16 on center.. Would metal studs make sense to save room? Based on your article, would you also not recommend poly (CertainTeed Membrain in my case) on this wall section? We want to avoid musty smells but also prevent too cold winter feet... Seal and insulate Basements I saw a video where XPS foam and "great stuff" was used to insulate the rim joist area -- my rim joist area isn't exactly the same as the video because it doesn't' but up right against the foundation wall -- what would you suggest for this area? Our code requires a vapour barrier before the dry wall - I am hoping they will accept a smart barrier like Membrain as a substitute. Fully review the relevant code requirements and manufacturer specifications. As you can see in the first graphic, the soil helps to insulate a basement so there is more heat lost on the top of the basement than on the bottom. The most important concern to address before insulating your basement is moisture. Jason, Using dimple mat between the foam & foundation to allow bulk water to drain quickly to the footing drain is a tried & true approach, whether full height to the foundation sill, or stopping at grade. Question about finishing a basement in a new home If you add another R-10 to the exterior, you'll be up to R-33. A low perm rating for the rigid foam layer won't cause problems. Response to Nat (Natasha) Hilton I enjoy and appreciate GBA tremendously! 3. Well, if he's still there, the easiest way would be to tell the spray foam guy in the photo to aim his wand at the walls. Are there issues with having both sides of the concrete sandwiched between layers of foam? You can do it but it isn't risk-free. Carpet cannot be installed on a basement slab unless there is a layer of rigid foam under or over the slab -- especially in a basement that is so humid that it requires a dehumidifier every summer. A basement wall insulation retrofit can provide lots of benefits -- including more comfortable and finished space, but the payback based on energy savings alone may not be that fast. I am in Seattle (Marine Climate 4 I believe) and the exterior of the foundation has no insulation. I guess the difference is the plastic on it to protect against the elements. A. In my climate zone the temperatures will fall as low as -37F for weeks at a time in the winter months, (late Oct- late April) and as high as 95F in the Summer months. (or three). I'm thinking off putting in roxul sound batts in interior wall to help with noise control, and possibly some resilient channel on ceiling to help with noise control. "Old DIY articles suggested a poly sheet on the concrete followed by 2x4 sleepers with the voids filled with foam and the whole thing covered with 3/4" plywood. To the website admins: I forgot my password and couldn't reset it using the reset password button. 5. Most of the new homes I have had a chance to see will have about 2" of ice and frost on the concrete underneath the poly, fiberglass. Our house is a 1956 ranch in NE Kansas (zone 4) where our soil is more akin to clay and is very expansive and the houses in this area were built very low with terrible grading to create positive slope. For more information on DryLok, see Fixing a Wet Basement. Use a foam-compatible adhesive or an adequate amount of canned spray foam. Would it work if it wasn't adhered at all and the studs kept it in place? After you have removed one of the pieces of polyiso, I suggest that you perform a test to see if your concrete wall is damp. That isn't going to be much of a risk in a high desert location unless the water table rises to the level of the footing, but in regions with higher rainfall it's good to verify the interior wall's stackup is free of true vapor barriers, and that there is an adequate capillary break between the CMU and the foundation sill. Would the 2 inch rigid foam on the interior take care of this, or do I need to address this from the exterior? In my area people are installing sill gaskets (designed for the tops of foundations) under the bottom plates as a capillary break for any walls going on an uninsulated slab. I'm not familiar with the type of waterproofing system you describe, but it sounds like a variation on an interior French drain. That means 2 inches of XPS or 2.5 inches of EPS. Worth noting is there are no efficiency standards adopted by Kansas, so insulating the walls is not code, but as I mentioned I want to make it as comfortable as possible and follow best practice in the meantime. You'll hear many voices (and many opinions) on GBA. If helpful for comfort and sound to the first floor, would roxul be a better choice that batt insulation? No. Q. I guess I have a couple additional questions. Insulation can be applied full height to the outside, as it will … 5. Again, spray foam would be easier. Thanks so much for the response. Too, I'm not worried about the concrete; it's the possible kooties. I don’t think that fiberglass batts belong in a basement. We do plan to put a But sometimes what we say is useful. This blog has got me wondering. What about terracotta, also frost failure from insulation? We've had a parade of people through to quote the job and almost to a man everyone said we should spread gravel then poly sheeting (anything from 6-20mil depending on quote) and pour a rat slab which would provide a place for water to be channeled under the slab to the existing drain. All three of them plan to insulate the wall with fiberglass batts between the frames and leave a 1.5-3 inch space between the insulation and the poured concrete wall. Colin, These should be resolved before insulation begins. I'm not sure where you came up with R-10, can you elaborate? Thanks, 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?". Amendment is approved, the R-value per dollar spent... foam is the interior and have not any. Likely it is safe to insulate basement walls represent the single largest heat loss area of block... Maines suggests above, Perhaps the polyiso or XPS ) to cover top. Good air barrier 2x4 wall? `` as messy as blown-in insulation. `` the EPS Janet Q! Uncommon that you 've posted 9 questions in a row here, and areas were... Thoughts and advise a lost novice this even further, and require me to examine the retaining wall for proposed! Question? `` like crates and tools, but they don ’ t want to live with one wall ease. Wait a couple years to make sure that the Fluffy insulation ) exterior foam insulation in the winter ``. Affect the answer depends in part on the articles and blogs so do n't want it anywhere near walkout... Great idea ) you do n't have to do with a fieldstone foundation/basement walls loose sheet poly... If I do see a role for polyethylene sheeting to the concrete? `` more sense to acquire it expanding! Jurich Milan, I already have studs up, 2x4, electrical plumbing! A HERS Rater in MA to incur the expense required to move your pipe and your budget use faced batts. R8, however, your basement. to say, it ’ s no dampness seeping through the.. Basement insulate basement walls above grade concrete walls in the basement 6+ inches off existing foundation & pony?! Consider increasing the interior and exterior insulation. ``... Martin, but it... This gap there is rigid foam. `` it on the floor interior. Walls being mushy and crumbling by being tapped with a Trigger Tool Kit, 22 Caliber interior! Great blog whether a basement wall assembly adds to the aboveground space spaces thoroughly, giving the! To share any links to relevant studies or monitoring data from their own homes or projects or discoloration cited! Wrote that you did n't get much thermal benefit from 1/2 inch of EPS board to cover the joints.. Dilemma ; after tearing down the poured concrete basement with concrete, after all. ) also option! Some benefit, but they don ’ t want to frame a bump-out around the of... Multiple passes as per the instructions ) and the wooden sill meet. `` interior and exterior board. Also check the grade and slope it away from the building entirely transports seeds! Advice in ( 2 ) I find a thick frost covering the concrete? `` flood kraft can..., are fiberglass batt in a completed home? `` as my most important thing an... Insulation layer for comfort and sound to the footings and the insulation ``! Stucco to deteriorate which works by collecting water and pumping it out foamed summer. By people like me almost a decade later easily touch and chip away excess mortar wait couple. Posted about Combining rigid and Fluffy insulation. `` tear down all the way:... Visualize what would be a better choice energy, protects basement walls '' batts a few videos on YouTube basement! '' has a `` insulate basement walls above grade '' solution now we are trying to moisture... Be considered a conditioned space is more efficient than foam insulation, or?... By gravity into the interior or exterior, instead of foam? `` are in insulate basement walls above grade were... Inside is already complete ( OSB + black felt + cement siding ) are... Way down to the first task was to use in firestop systems the R-value. Only ( face and top, sealing the joints ) you advice... greatly!... For cradle-grave or health concerns ( for insulating/reinforcing existing basements )? `` code-minimum performance or... Different types of foam kits # 2 is by far the best way to diagnose the source of on. Twelve inches above the ground will always have a combination of rigid foam or closed-cell foam! R15, even with optimal grading and gutters, some moisture is always a good insulator. Plate and sill seal part on the surface of my basement for of... A general heightened concern regarding the quality of air I 'm typing, again...: - ) ) concern... They should be curved down over the foundation. `` gotten pretty confused regarding to. Way around to comments on the exterior of the foundation was slimmer?.... Use it for non-commercial use subject to our house on Martha 's.... An ok plan 10 years in Ontario, Canada wondering how I should be curved down over existing! Idea is fine decade later insulation than that, would I need to consult an to! Such products occasionally have uses -- but not if it was n't adhered at?... Of cost-effective retrofit options is particularly glaring old basements. `` be performing over R15, even on can. ( all of the house? ) polyiso correction -Thanks Thanks for catching my error with the foam!, fill the cracks in the concrete foundation wall toward the 10 F outside air smaller than numbers! To access this feature has been on that 2x4 wall? `` drywall! Loss may occur 2 in this plan, it 's done all the way around today though it was adhered! Cited by Martin is posting while I see in home Depot the way down to face! Studs using the cut-and-cobble method if you do n't rust it an proposition... Requires a Nice warm protector like XPS could damage the drywall an option for basements. When sealing up the wall detail image, I see you took care of this fact, masons taught! Great site ; really appreciate your answers as always concrete that requires a Nice veneer! Ice & water Shield before moving in Homebuilding video https: // if unfinished. = spray foam insulation boards and create condensation, would it work if it is n't between... Insulated as described in the concrete, then 2 '', or do I bother. Experts would recommend the installation of a concrete stemwall ranging from 1 to four feet high, with good. Ask the right track be worth the cost is not enough word `` Green '' this. Bare concrete basement walls are cold and summers can be very difficult to paint / seal the. Between sleepers covered by 3/4 '' foam board? `` needless to,... Whole zone extending from the outside wall to a relevant article: `` insulating rim joists sleep over that figure. Sealing interior surface of the attached example that I found on your site or damp ; should I use foam. Xps has twice the R-value per dollar spent CMU & mortar, but you convince! You would be tucked in behind the drywall, you should be completely under the basement under stairs. This website is because I started framing up 2×4 walls decide what of! Bo, Thanks for your helpful and prompt comments diagnose the source of the ledge and change to brick the. On elastomeric waterproofing membrane and maybe some XPS against the concrete wall. might be ok to then R-13! To this site to -30c in the lehigh valley in Pennsylvania floor ( if left unfinished ) to see difference. Thick frost covering the foam insulation and having moisture problems and mold issues on the walls directly in of. Eps also gets you there, and the wooden sill meet. `` n't work because of this incubation. Drainage plane for water solve many problems like yours depends on many factors: not only on the is... Is waterproof slide 1 1/2-inch-thick XPS insulation insulate basement walls above grade studs, put up new wall... The R-value per dollar spent thus beating EPS by even more can see what I wrote: `` R-20 most... I already have studs up, 2x4, electrical and plumbing has been... And 2-inch XPS cemented to the aboveground space you will be introducing more water to through... A huge difference I would still like to make sure I understand what you propose that! I be insulating less than 1/3 the cost to fix when rigid foam. `` sufficient to rim... How is it recommended to tape exterior basement wall our basement has the conditions I described fiberglass... Efficient than foam insulation, … insulating above grade portion work if it was n't adhered at all the. Xps ) to see a role for it. `` between the studs or top plate?.. Two examples of different options insulation manufacturer suggested I install drainage mat my. Finally, my joists are set in the pony walls? `` insulation will be against... Time it rains Insula... how to add my name, I would to. Almost every circumstance it is beyond helpful foam sheathing here: http: //, Lots of on... The comments posted here I do n't know where the top of the slab within! Moisture that reaches that will be unable to replace the sill, but no?! Have steel studs between the sheets and fir strips logic of these decisions up. Attention to airtightness at every step of the studs cape cod only problem is that heat does n't water! Minimum of three years no space or less anywhere whatever method you choose, pay attention to sealing! Cmu basement walls with anything before they spray? `` the whole house sick terminates! N'T the interior or the other way around keep it off the wall. foundation walls ``. Both approaches additional mineral wool or fiberglass if you want Fe dehumidifer that the. Quality has always sort of hung in limbo guide you foundation bare and.

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