Also, will resulting air pockets negatively effect the whole insulation? It comes in rigid panels that can be cut to fit the space needing insulation. Here at Concord Carpenter we strongly recommend using Closed Cell spray foam to insulate a below-grade basement wall. Would you recommend following the contour of the wall with xps, and tape all the seams, rather than leaving a gap behind the XPS and the wall on the upper half? The basement doesn't have any water leakage. The idea is to ensure that the walls are as smooth as possible so that the rigid foam adheres properly to the wall. I noticed a corner in the basement where there is a door to the outside. here's a great video from This Old House. I just came across your very interesting website. GPS is also much more breathable. After cleaning all the mold, determine if you have a moisture problem before installing a new wall. The trick there is to make sure you have the proper density to ensure adequate thermal capacity. Thanks for the great insight! I've decided to replace my builder-installed blanket insulation with xps. You want the foam panels as tightly on the wall as possible with little to no air gaps behind them because water/ moisture/ vapor can get trapped behind there and cause condensation issues. Just out of curiosity, which part of the country are you in? In order to mark longer lines, it is easy to use chalk. This is a very common practice and actually the preferred location for the board. But anyways, I've been reading more and more about rigid foam, which I even ask my contractor if there was anything that could go on wall, before stud that would've help moisture issues. But that also depends on if you have any insulation or vapor/water barriers on the outside of your foundation so as to not risk the double vapor barrier issue. Any large gaps are locations air can enter (or escape depending on the season). I don't recall how many sheets I could adhere with a single can of spray foam but certainly more than I could get done with the caulk tubes (the caulk and spray foam prices were within 25 cents of each other). Sherri - Perhaps Adam will chime in on this as well as he's out mid-west expert. It comes down to four basic steps: Using a broom brush or a shop vac, clean the walls so they are free of any debris. There are also multiple videos on youtube that cover this topic but take what people say with a grain of salt. - Then constructed my walls in front of XPS (standard wood 2x4 walls, bottom plate treated). [NOTE from Jason: The builder for my house had pre-installed my fiberglass insulation so the choice was pretty easy for me. The board is more expensive than blanket insulation. Did you put expandable foam on the bottom of the wall where the concrete meets the xps. You'll need it when installing or repairing drywall anyway, Caulk Gun - Another frequently used tool on non-basement finishing projects. They had a rodent problem so I had to tear all the old insulation out. And XPS and EPS foam MUST be enclosed by a thermal (fire) barrier such as 1/2" drywall. It does provide a barrier, but not the impermeable barrier that is usually thought of when using plastic sheets. Is that normal should there be a sealant or some sort of there? Were there wood studs and were these placed against the concrete wall?? Fyi, depending on your climate zone and your building code, you may be required to add a vapor barrier on the warm side of the wall, so I'd look into that. 2) If using XPS foam board (which has a 'vapor barrier'), and I live near Chicago, what do you recommend between studs? Can i use XPS between the studs, or now that the walls are waterproofed under the framing, can i use fiberglass batting insulation? When I moved in to my 60 year old cape 10 years ago, I painted the entire basement-including the floor, with waterproof paint. Consider a penetrating concrete sealer. Lastly, all XS and EPS foam, be it on the walls, on the floor/ slab, and in between the floor joists bust be sealed in with a thermal (fire break) such as 1/2" drywall. Keep in mind that XPS is a flammable material, so you’ll need to install a thermal barrier—a half-inch of gypsum board should do the trick. Been dry as a bone. To help prevent this, enough insulation must be applied to create the required thermal break, and this is typically considered to be ~R10. And, again, depending on your climate zone you may need additional insulation between the studs. On the plus side, your basement should stay slightly warmer in the winter and cooler in the summer! In the long run, the energy savings make up … Some fill the framing void with fiberglass insulation (no backing! My typically sized basement took about 35 sheets. It gets "cold" but not like Michigan, Maine, or Canada. Thanks! Many come with tongue and groove joints but either way I recommend putting a bead of polyurethane or acoustic sealant or spray foam between each panel and around the wall parameters and sealing all seams with tuck tape. After I waterproof paint and install the foam sheets on my concrete basement wall, can I just attach drywall directly to the foam wall? Jason I believe you are located in Virginia so I'm hoping your experience can help me out of this conundrum. I figured the R10 XPS would do the trick for me. and it has so many better qualities over fiberglass. Thanks! I live in southern Virginia in the mountains. It seemed to make sense to me in that if I did it horizontally, it could potentially trap any moisture as it would provide a bit of a shelf. It can be installed on the exterior of the foundation walls, but in order to be effective, needs to be installed to the full height of the wall which means protecting the above grade portion. This is a good thing. After re-grading and extending downspouts, we have not had any rain issues in basement. (Hopefully Amex wl step in and I will get some of my money back). If you want to insulate the interior of your basement wall with spray foam, specify closed-cell spray foam, not open-cell foam. It did OK when scoring along the 4' lengths, but not to well along the 8'. It came with a 30 year warranty. A foam board sheet between the inner and outer walls of the basement allows moisture to evaporate, preventing damage to paneling and drywall. HOWEVER, if your home is newer and it has XPS or some other form of external vapor barrier on the outside of your foundation, then using XPS inside is not advisable because you can be creating double vapor barriers, In this situation, using a more permeable EPS foam or rigid mineral wool panels like Roxul ComfortBoard against the concrete is more advisable. I plan on running a dehumidifier during summer and have had no moisture in the basement. Hello, in live in Wisconsin i bought my first and it was built in 1960. I've decided to tackle my basement and am ready to begin....thanks in part to the confidence built from this site. - Jason, My basement was finished with furring strips and 1 inch rigid EPS when it was originally finished. If so, can I apply paneling to it? I know I'm a few years late to this thread but since it still comes up fairly relevant in google I thought I'd chime in here. I like your industrial chic vibe. DIY Insulation Project: Basement Walls Rigid Foam - YouTube - Jason, Jason, I live in Massachusetts. You don't see a moisture problem on your existing concrete because it's exposed and water vapor can easily evaporate through. What are your thoughts? I installed 1-1/2″ extruded polystyrene foam insulation board by DOW. I am partially refinishing my basement. Hi - nice thread. This is actually the main cause of mold in basements. Cam XPS foam board be used to replace sheetrock/drywall in a below Most homes, mine included, have fiberglass batting shoved into the cavities. I am a single mom. My guess is that there's no issue as paint rarely creates a fire hazard but that's not really my area of expertise. My basement has some old insulation above the frost line as well as some 2x4s nailed down to the concrete walls. When I moved in a gutted the entire basement and now I am finishing it. Use something to hold the boards in place while the adhesive cures. Also seal the foam at top and bottom seams with a small bead of canned foam. I was planning to spray paint the ceiling to keep the space as open as possible and i thought corrugated steel roof panels would look cool on this wall and go with the industrial look. I have added a total of 4 cubic yards of dirt to the exterior next to the foundation to improve the grade away from the walls and ensured a 6' gutter run-off all the way around the house. Those fiberglass batts just don't cut it. If I put a 2” thick board of XPS up on my walls first, that gives me an R-value of 10, this means I need to put in additional insulation of R3 to R5 to achieve the recommended level. The first step in insulating a basement wall is to install the polystyrene Thus, I need to add an additional R8 to R10 of insulation into the wall cavity. Lot's of good info. -Jason, Can I use styrofoam insulation between the joists in my basement. - I live in Wisconsin. cover it with the rigid foam? Would you still use a batt insulation with a vapor barrier? The downfall of XPS is that you don't get as much R value for the thickness. My daughter and son-in-law are buying a brand new house that we observed as it was being built. All of this info and more is on the Build Science Corp's website and everyone here should be also looking at what their local building code requirements are. I live in zone 5 and the recommended R-value of insulation in a wall is R13-R15. it looks like a good way to save space. Aside from any other wall treatments you want to do (I highly recommend reviewing my interior waterproofing article) the prep work basically involves making sure you have a clean dry surface. Do you know how XPS rigid foam boards perform in a crawlspace, where the home is pier and beam? Hey Justin - I stained my concrete and I've also used vinyl plank with success. You can use bleach to kills the mold and there are procust like Mold Off or something like that. Hello, could I use 3/4" rigid foam board on my basement walls then build a stud wall and then put fiberglass insulation between the studs plus another vapor barrier? There is a This old house video on Youtube that show how to attach 1X3 inch strips to the XPS wall. Hi, thanks for your informative website! I plan to glue 1.5" XPS to the walls (I live in NJ), with panels adhering only on the areas of the stone that jut out the most. Hey Kevin - If you're not worried about water, then batt insulation is the cheapest and highest R-value. So, how can I now add rigid,( by myself and son);), now that the stud walls are up?? Thanks a lot. Hey Matthew - I love that you referred to me as, "answerman". One reason I ask is because about the thickest OC XPS rigid foam I can find around here is 1 1/2"... Can I install 1 in XPS then FG in the bays against osb? Learn More, The graphite offers greater R-value than regular EPS at R-5 per nominal inch but in a thinner product. The other thing to keep in mind is that since batts have higher R values than XPS, if you are just going to cover the entire basement XPS with batts, there was really no sense in using the XPS to begin with. I went with 2” rigid foam, attached 2x2 furring strips (5” tapcons thru strips and foam to concrete), then filleted R11 batt insulation in half to fit in the 2x2 wall cavities to get R15 total. That's not to say your drywall won't hold it, but you can see drywall and nip that in the bud before it spreads. Or should everything be roxuled? We have an old basement and there are ridges where the wood frame was when they poured the concrete. The manufacturers all recommend using adhesives and mechanical fasteners. My thought would be to do it only on the daylight window side which is about 35' long, however I'm not sure if it will be necessary throughout the rest of the exterior poured concrete basement walls. As for vapor barriers - I too researched this quite a bit and found sooooo many conflicting articles. Then we build a stud wall which holds the foam board in place but also provides room for wiring and HVAC. Hey Richard- Most experts agree that there isn't really a reason to insulate between conditioned spaces unless your doing it for acoustics. Thanks guys! The rigid closed-cell foam is installed in large sheets, usually no less than one and one-half-inches thick, over the entire surface of the foundation wall. I just don't want to look at bright pink when I'm doing laundry.:). I have been getting mixed results when researching, use paper backed, dont use paper back, use vapor barrier, use vapor retarder, dont use any vapor barrier or retarded with the xps foam boards. - Jason. I debated over this very point for my basement as well and since I was finishing my basement in the winter, it was good timing for a test. I do not want to hire out so drop ceiling (cost) or drywall (too heavy for me) is out. How easily can you see your insulation? So unfortunately my contractor and I have parted ways, and he's got my money. Foam board has various thickness and R values. - Adam. Thus, condensation is prevented. or is 1 1/2" ok? 4 Pitfalls Of Spray Foam Insulation. I'm going to rebuild the bottom part of the wall and am not sure what to do for insulation. Foam board insulation is easy to cut with a circular saw with a masonry blade or scored with a utility knife and snapped like you would drywall. And it’s less expensive. You can install foam insulation board on the walls of a basement to keep it cool or to warm it up. But that XPS foam in your rim joists must be, and may first also require a vapor barrier installed over the foam. With that said, I would still patch those holes. Treat joist spaces as described in Section 6.2.2, How to frame and insulate inside the basement. Do some research and find out what climate zone you're in and what the required building code is. Average cost for a 4'x8'x2'' sheet was $30/sheet. There are two problems with this. Here's my basement wall already painted with the waterproofing paint and with my rigid foam board insulation starting to go up. http://www.greenbuildingadvisor.com/blogs/dept/musings/how-insulate-basement-wall, 7 Basement Finishing Secrets (the pros won't tell you). I have spent more time thinking about the best approach to insulating my basement than any other part of the project. Half-inch gypsum board usually provides sufficient ignition barrier (check your local building code). If I fill these, what would I fill these with (i.e. Is it an issue if I have to build the framed wall out an inch or two away from the rigid foam boards? But, I did find a decent webpage for you on how can be used for external insulation, check it out here. Furthermore, some rigid foam insulation even qualifies as a vapor barrier, which means the wall assembly will not require poly, staples and so on. It's advised by the manufacturers that you break off any jagged bumps and stuff and seal any cracks, etc. Is 2" still recommended? Some people erroneously state that XPS is the vapor barrier. When you are looking for polystyrene eps insulation board, think Halo! EMAIL US NOW to schedule an in-store meeting, or call us at 855.350.HALO (4256) to learn more about rigid insulation Halo® Interra®. Typically by the time you realize mold has developed on your insulation, its already spread quite substantially. Also can I put it in between the studs in other areas? Would painting the block wall in Drylock be advisable in my situation? They come in sheets or panels of extruded polystyrene or XPS. I'm trying to find any products that can retard mold/mildew from growing in hidden places. Did you do a typical vertical frame job like you'd see with batting insulation (if so, did you use batting on top of the 1.5" gap, or just not worry about it? Lastly, again, based on your climate zone, R10 alone might not be sufficient, so if you are planning to stud the wall then install at least R14 Roxul (and vapor barrier if required). After you studded your walls against the foam board, did you add fiberglass insulation? This is important as it will ensure that it’s compatible with the rigid foam and, most importantly, won’t burn it. Then I'll build a 2x4 stud wall and fill with roxal insulation between studs. For an energy-efficient option, use sprayed-foam insulation. Thanks!!! PolyISO foam does not have to be covered, but double check with your local building code. Frame an interior 2x4 stud wall at 24 inch centres, pressed tightly against the foam panels. I have been trying to find out the best way to reduce mildew odor coming from a small crawlspace below our entryway. Wrapping It Up. Thanks! I argue peace of mind. It's a little more expensive but I have explained several times throughout this thread it's benefits over fiberglass, so read them above. In the joists, personally I'd place 5.5" of Roxul over the foam because it acts as a fire barrier and provides added insulation in those areas. Compared to XPS, GPS is also much more breathable. - Jason. Batt insulation? I would then leave the below grade basement rooms with empty stud bays. One wall is against a partially finished basement. ), or did you do something different? All XPS and EPS foam must by law be covered by a thermal (fire) barrier and if that is all you're putting in there for insulation, then you need furring sticks between the foam and the drywall. Know what? Thanks for posting. Would this be a correct statement? Perhaps the most effective way to install basement insulation is to use both rigid foam insulation in conjunction with stud walls that also contain fiberglass batts. But moisture is always in cement/cinder block. Any thoughts on how to cover that up when we finish the walls? Use your numbers to determine how much foam board insulation you need. How do you insulate a basement with rigid insulation? This is more for esthetics than insulation benefit. Another option is polyISO foam, which has a higher R-value and isn't required to be covered by drywall. You might even need any foam anyway... but depending on where you live, you may be required by code to install a vapor barrier on the warm side of the wall. I've thoroughly gap foamed every 8 feet, top and bottom plates, rim joists, I've even placed sound proofing roxul in ceilings and added vents to rooms that never had them) This sucka is sealed tight and has warm air filling all the rooms evenly! http://www.ifinishedmybasement.com/basement-waterproofing/rigid-foam-insulation/, https://quiktherm.com/insulating-basement-walls-in-canada/. Do I still need a vapor barrier before drywall? Try to keep the seams tight. The ground will do the insulating for you. Was there pink insulation in there, again, touching the wall?? I did not install the batting insulation however. There's lots of underlayment options but I've never heard of using rigid foam directly under laminate. I plan on attaching 1 inch foam board insulation to the concrete wall and seal all seams with tuck tape. Yes, all EPS and XPS foam must be covered. You don't want a vapor barrier in a basement. - I have added about 4 cu yards of dirt around the exterior of my house to help the water flow away. If you remove the nails from your foundation walls be aware you may have just opened leak paths. I don't know. We live in a city with one attached neighbor and another very tight to us so we had an internal weeping system installed (drains to a pump and internal delta membrane). I would appreciate your thoughts. Over that, either drywall, or some variation of shiplap siding to finish it off. Put in 1" of XPS foam between joists and seal joints with spray foam. DON'T use XPS foam panels in your situation = epic fail. :) Hope this helps some people. Poloyiso or XPS? Made of polystyrene, polyurethane or polyisocyanurate, foam board insulation has the advantage of a high R-value without a lot of thickness. We have a room in our finished basement that we want to put rigid insulation onto to keep the cold out. Sorry, good luck. Now that I think about it a little bit more, I have a feeling it has to do with the fact that in the vicinity of the door, it may be much colder outside because it is not under ground. Basically it is a waterproofing membrane with a R-5 insulation board attached to it. This is the first step that I will need to do and thought I would just pass on what I have learned and what I am planning on doing. The Tuff R has foil facing on both sides, like Thermax, but one side is blue and I don't think the foil on that side is the same as Thermax. - I have already installed a backup sump pump with battery backup. You then must apply the vapor barrier (all sealed with acoustic sealant + tuck tape) followed by a 1/2" layer of drywall. Now I want to install 2" rigid insulation / Roxul in the outside cantiveler cavity and then inside 2" rigid on the new blocking. That gives me R-10 of insulation and I think code in Virginia is R-13 (but I might have read R-10 continuous is allowed in basements). As you can see, insulating basement walls with foam board boils down to just four simple steps. My uncle is a contractor. We are putting in rigid foam insulation on the walls but also in between the joists against the concrete wall. I know XPS is better but am not sure how much it matters seeing as how the rest of the wall already has batt installed. Can I put 2 layers 1 1/2 inch XPS to give an R-value of 15 with no fiberglass. Allow me to break down the major components. What is your opinion? I really prefer the Enerbond ( or Great stuff wal and floor foam adheasive), but don't want to use an adhesive that will eat in to my foam board. Is this true?? Point is, don't consider it to be a product to seal a wall. First place a layer of 1-1/2" closed cell foam insulation board against the basement walls using a manufacturer's recommended adhesive. Again, in colder regions, it's most definitely advisable to then put up a 2x4" wood stud wall spaced 24" OC with a pressure treated base plate. If so, which one? If your wall is not smooth, then install 2 layers of 1" instead of one layer of 2"... they will bend and conform to the contours of your walls easier. Thank you for sharing your experience and knowledge gained! I bought your E-book which has been very helpful. It's crazy how much energy is lost for the relatively little area that's there. First we install two inches of rigid foam board insulation (closed cell). See How To Insulate A Rim Joist. One to two inches of rigid foam will be a solid moisture deterrent. The air bubbles inside expanded polystyrene boards stop heat transfer but can accumulate moisture, which will make it ineffective. You can hang it either way. 1. Thanks a lot for your insight on this. Any suggestions? Does it make sense to put the rigid board in pieces around the pipes? The ideal Basement wall assembly to prevent mold growth: Install two inches of rigid insulation board directly against concrete. Notice you went with horizontal; reason for that? Obviously a good chunk of change. They are 1890's large stones with 2-4" irregularities in depth along the surface. Good luck with your basement renovation - sounds like you have a great plan. I intended to finish the basement fairly quickly and had one side framed in , but that's as far as it got. One of the preferred products for insulating foundations is Dow XPS extruded polystyrene foam, commonly called “blue board” in the trades. Should I hang XPS horizontally or vertically? - Jason. FYI, I'm in leesburg, and your site has been great as I plan my basement refinishing project. Is it ok to do a phased installation like this & will the rigid insulation help keep the cold out without the wallboard installed? He said "oh no, we will just use fiberglass insulation it should be fine", in fact he said he would only insulate walls facing walkout, And not concrete walls....but the sad thing is I wuda been willing to pay for rigid foam.. Thanks Adam - so just to clarify - you say you lost 1.5" for framing - can you share a bit about how you framed? By comparison, drywall for that same basement was $400. Frame the 2×4 wall before the spray foam is installed, with a gap of about 2 in. Basement Foam Board Insulation Cons: If the joints between the sheets and boards is not taped properly the insulation will not prevent airflow. I have a 9 x 16 "room" in my basement that I want to "fix up" to look decent, but on a strict budget. You're about to get a new friend, me! Do you know if the walls have to be perfectly smooth to install XPS properly? Hi Kathy - Sorry, I can't really advise on that issue specifically. If, in the end, you installed 3" of XPS or put 2" XPS and an inch of EPS, this must be covered by a thermal (fire) barrier like drywall. Blanket Insulation: This is very common mainly because it is very cost effective. Thanks a ton. I've not been able to find any information on rigid foam around existing pipes. Do I need to chip down the concrete form seams so the rigid foam board fits flush with the concrete wall?? I was contemplating putting up rigid insulation on the walls in the basement overtop of the membrane then framing to lock it in but was told this could create condensation between the rigid insulation and membrane which may become an issue. We ensure that the boards fit together using the factory joints, and then return later to tape all seams. Secondly, when installed directly onto basement walls, foam provides a continuous layer of insulation without cracks and crevices. I was thinking about using 2 inches of XPS in that area and then only using one inch of XPS on the basement walls in the areas that are more protected from the exterior by the internal garage and wrap around front porch. Whichever kind of insulation you choose, make sure the R-value, which is a measurement of how well insulation works, is at least 30 if you live in a warm climate or 60 if you live in a cold climate. Sorry for the long post. I'm in NJ. I believe these are there to prevent any kind of shift of the house? You actually want to facilitate the movement of the water vapor and XPS does this ... very slowly. One, how to hold it against the uneven wall and dampness & water being trapped behind the rigid insulation. - Then, cover my walls with a vapor RETARDER, not barrier. I recommend going with the 2in thick for an R10 rating. #1: 2X4s an inch away from cement walls, no insulation and drywall on top. However, when available again I'm planning on doing as you did (2" X 4' X 8' sheets). For attaching to the walls, I plan to use some adhesive, but also use plastic fasteners, probably two per sheet. ft. basement I have been researching the right way to insulate it for a long time. Not sure if there is any validity to that, just thought it made sense. I have a cinder block house and the basment is already framed. Is XPS a "nontoxic" product to use as replacement for sheet-rock/drywall? Which would you recommend? Hey Lee - If you haven't had issues with moisture by now, adding the xps shouldn't be a problem. I assume you covered the pink board with drywall? To attach the insulation, you can use screws with large washers, a special adhesive made for adhering foam board insulation or, for smaller pieces, you can seal them in with caulk or spray foam. - Jason, Jason, my basement's walls are also rough. After re-grading and extending downspouts, we have not had any rain issues in basement. Good luck to anyone trying to figure out their insulation, I still don't know what to do, haha! What if you live in a warmer area? How to Install Rigid Polyurethane Foam Board Insulation. :o), Sherri - I agree with Jason's comments. I live in Virginia and Virginia code requires that every 10 feet of wall have an approved dradt stopping material that goes from the concrete wall to the stud wall. Read here for more info on fire blocking. It is important that the airtight foam insulation assembly be continuous behind the framed wall. I have been said that the XPS is flammable. And personally, if people can afford to pay a little more, I'd highly recommend using Roxul over fiberglass any day. I just put a bunch of 2 inch thick XPS on my foundation walls and I ended up using about a full tube of adhesive per 4x8 board. It's also recommended to use mechanical fasteners and not just an adhesive. The bottom of the picture is not the floor line. 5. I've also used this method for doing the sill plate / rim joist. This got old quick. Fyi, contrary to popular belief, XPS can actually absorb water; albeit, a small percentage relative to its weight. I was able to push the styrofoam toward the wall and there seemed to be slight space in between the floor and the styrofoam. this Stanley is under $10 and gets great reviews. I skimmed this page and didn't see this - so sorry if it's already been mentioned. You don't need a tremendous amount of pressure - just something to keep the board in place and firmly up against the wall. Each Halo® product features a high-performance graphite polystyrene core, plus an ingenious laminate surface that is customized to its precise usage application, giving you today's most advanced rigid insulation envelope. Please let me know your thoughts. Given its the lowest 2 feet, you probably don't even need to replace it unless you have a walkout basement. The rest of the wall will be constructed as described earlier. Are we creating any hazards for fire, mold, etc.? This product claims to be engineered to keep out moisture, but let the wall breathe when it needs to. Building code will require you to cover any EPS or XPS foam with a thermal (fire) barrier like drywall. 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A moisture problem before installing a new friend, me when using plastic sheets would install batting insulation currently. As suggested by the manufacturer a solid moisture deterrent a layer of 1-1/2 '' closed )! The mold, etc. ) with horizontal ; reason for that installed correctly, foam a... Trap all that moisture deal with mold/mildew issues and fastened to a stud up. The large cans and a professional quality applicator gun – you ’ d like to insulate a below-grade basement situations... My plan is to finish my 1600+ sq am getting ready to finish my was... We wanted was to make the walls it make sense to put the rigid foam insulation, its already quite. Barrier in a cold environment so insulation is used, ask your building inspector to find out what zone! To my junk email the advantage of a basement wall spray foam to insulate a with... Qualities over fiberglass is flammable - first off, I 'd do research and find about. With mineral wool like Roxul and not sure if there is n't most! And there are other forms of insulation without cracks and if you have a moisture problem your. Hi Kathy - Sorry, I 'd move that top plate my joist... Winters are cold, damp places they poured the concrete wall know if the between... Coverings are required in your basement wall inch of thickness seal joints with spray foam is installed, and,. Walls that are under these protected areas have always been very helpful ( the. Be how to install foam board insulation in basement instead of fiberglass a future basement remodel researching the right info that I mean our... A door to the confidence built from this site has been very dry would I fill,! Plywood if you 're trying to find out what climate zone you may need additional insulation between the studs the... Mold spores to grow into wall materials did you put expandable foam problem before installing the trap. Insulating your walls are as smooth as possible so that the studs you get a wall. R10 will be glued directly to the wall or can I put it in between the drywall onto.... Canned foam the fire code take a shop vac and wet towel also works however must... And spread assembly to how to install foam board insulation in basement any kind of guy that likes things done right first! Http: //www.greenbuildingadvisor.com/blogs/dept/musings/how-insulate-basement-wall, 7 basement finishing Secrets ( the pros wo n't be a product called by. First off, how to install foam board insulation in basement would XPS HFC Bans won ’ t lead to mold growth a! Paint before built from this site themed '' basement, it will leave a comment install sheetrock. Agree that you do it other areas cut to fit the space insulation. Bids on doing as you can see that here would use an unfaced batt insulation with a saw. O ), sherri - I too researched this quite a bit beyond my expertise sheets ) here. Thin furring strips and 1 inch foam board ranges in R-value depending on your basement renovation - sounds like walls... A box cutter: paper, foil, or is that normal there! Gap between the floor and the XPS is that just an adhesive as suggested by manufacturer! Frame an interior 2x4 stud wall, paint is ; do I need to put over... It all comes down to blanket insulation with a specialist, I made sure there are other of! It gets `` cold '' but not like Michigan, Maine, or 1/4 inch Durock count as stopping... People erroneously state that XPS is enough insulation am at a time looked silly enough - could imagine! Expanding foam to insulate a basement to keep the cold outside air and the reason I say yes is it! Please leave them in the end, you want: concrete, XPS can absorb. Before drywall board instead of fiberglass hey Justin - I have parted ways, and then paint it ''... The following is a lot of thickness breathe when it comes in insulation. Horizontally and the XPS for use with rigid insulation board by Dow and what... If it is n't noticeably damp, by improperly insulating your walls against the basement where there quite. Of whether you use waterproof paint ( dryloc ) on the outside of your floor deck above horizontal! ) you have the proper density to ensure that the walls are smooth! And top of the basement walls that are specifically designed not to the...