how to install foam board insulation in basement

Question is, will the XPS trap moisture between it and the batt? I would remove the 2x4s before installing the XPS. After that, thin furring strips are installed on top of the foam to provide a firm base for the drywall screws and drywall . Thanks Chris. - Jason. I have read conflicting approaches to this. If you live in a cold climate, then yes, I'd insulate all of the walls. My key concern is that the walls are uneven rubble stone that is not only uneven but also not square.. That is the walls push-out and I can't imagine being able to use adhesive to hold the insulation panels in place. Are we creating any hazards for fire, mold, etc.? Were there wood studs and were these placed against the concrete wall?? Sorry, good luck. Hi Laura - No, they do not have to be perfectly smooth - you should be good to go. Hi Chris, If I add some Fiberglass batts in the stud after I have followed all your introduction,should I need a poly-vapour barrier? Here at Concord Carpenter we strongly recommend using Closed Cell spray foam to insulate a below-grade basement wall. - Jason, Thanks you so much for the confirmation, I have found great things on the site already so I know I'll be visiting again!! Adam. Next, liberally apply an adhesive as suggested by the manufacturer. Do you know how XPS rigid foam boards perform in a crawlspace, where the home is pier and beam? And, again, depending on your climate zone you may need additional insulation between the studs. Conditioned basement space has a never-ending battle against moisture gain and heat loss. 5. Roxul has a higher R-value per inch, is water resistant, retains its insulative properties when it wet and will not sag, is fire-proof, termite-proof, pest-resistant, mold-proof, and provides excellent sound dampening. GPS is a newer product in North America, but it’s quickly becoming the “new standard in thermal insulation”. First we install two inches of rigid foam board insulation (closed cell). I have an older pier and beam home in Dallas, and am considering whether to insulate the exterior concrete perimeter underneath the house, but am concerned with moisture since it is not a true closed environment. Whether its actively accumulating on your floor (worst case) or the most minor of seepage through your foundation walls (best case), its only a matter of time. Seal the foam boards together with canned foam or a high quality building tape such as Dow Weathermate Construction tape or Dupont Tyvek tape. When this ignition barrier is supported on a stud wall, the cavities of this wall may be filled with supplemental insulation. Learn More, The graphite offers greater R-value than regular EPS at R-5 per nominal inch but in a thinner product. Also, in the case of an "aquatic event" in your basement, you can cut out and replace smaller sections of effected drywall instead of having to tear out larger areas in order to gut your insulation. The foam boards must be cut exactly to fit the area where it will be installed. DON'T use XPS foam panels in your situation = epic fail. Building code will require you to cover any EPS or XPS foam with a thermal (fire) barrier like drywall. 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. Any ideas? It's a little more expensive but I have explained several times throughout this thread it's benefits over fiberglass, so read them above. - Finally, cover with drywall. Poloyiso or XPS? Foams are not rodent proof. Secondly, when installed directly onto basement walls, foam provides a continuous layer of insulation without cracks and crevices. Obviously a good chunk of change. While rigid insulation application is mostly the same regardless of what type you use — expanded polystyrene (EPS), extruded polystyrene (XPS) or the latest advancement in rigid insulation, graphite polystyrene (GPS) — there are some notable differences. I built a 2x4 stud wall against all of the exterior walls. Insulation 101 Benefits Of Types And Installation Options . - I have already installed a backup sump pump with battery backup. I was told that the studs should not touch the rigid foam insulation, Yes, it should not touch. I want to maximize the insulation on the above grade wall. Frame an interior 2x4 stud wall at 24 inch centres, pressed tightly against the foam panels. Do I still need a vapor barrier before drywall? My uncle is a contractor. If you want help with or more information about the issues we blog about, then let’s talk. 2. Every 10 feet (or for a more simple installation, every 8 feet) you have a break in the XPS seams! I did not install the batting insulation however. You could also put up 1/4 plywood if you're trying to keep the cost and weight down. Floor Above Unconditioned Basement Or Vented Crawle Building America Solution Center. This was the option of choice in Jason's basement and I wouldn't discourage anyone from going this route. I recommend just going with the fiberglass bats at this point in your project. PloyISO also has a slightly higher R value. After re-grading and extending downspouts, we have not had any rain issues in basement. I would use an unfaced batt insulation under the entry way. Diy How To Install Basement Insulation. 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. I live in a brand new home (under 1 year). Very insightful, thank you Theodore. Certainly a bit higher on cost, but if your budget allows it, its provides an excellent insulating option and peace of mind. 1) Do you recommend sealing the XPS foam board where it meets the basement floor with caulk? Problem is, I don't know what insulation to use. Paint it with DryLok? I had all my framing lumber already in the basement so I just used that. We are planning a "themed" basement, that will look like an ancient temple or tomb, ala Indiana Jones. As stated in other posts, that is a problem for fiberglass insulation as it can promote the growth of mold. Hi, thanks for your informative website! - Jason, Jason, my basement's walls are also rough. I should add that there is some controversy about the video...specifically about nailing the tie rods further into the wall and potentially out the other side a bit. I read in one of your articles when putting up rigid fome to Install two inches of rigid insulation board directly against concrete. I hate to keep having to say this, but Jason is not correct. Living in the moderately warm climate of Virginia and not having any obvious moisture concerns and a limited budget I opted to just use what was there. There's lots of underlayment options but I've never heard of using rigid foam directly under laminate. I'm utterly confused and overwhelmed. Given its the lowest 2 feet, you probably don't even need to replace it unless you have a walkout basement. Any help or info anyone could generate would be awesome. Excellent summary and a very complete approach. I'm just in the planning phase of a future basement remodel. How easily can you see your insulation? 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? I intend to apply Owens Corning Foamular 2 inch to interior concrete block basement walls. The fiberglass insulation isn’t airtight so air will still get past it. I'd like to add insulation and figured batt insulation made the most sense since the walls are already framed, but wasn't sure if I need a vapor barrier or something else between the batts and the wall. The rim joist area seems to be the main area where the coldness comes through. According to the Building Science Corp, in colder climate zones you need a vapor barrier on the warm side of the wall and it's required by code. I framed in the traditional method as if you would install batting insulation. Don't you need to add drywall on top? Curious question: if you are covering foam board with a 2x4 stud wall filled with Roxul, then is a minimum 1/2" of sheet rock still required on face of stud wall or would a 3/8" sheetrock be permitted because of the use of Roxul inside the wall cavity? If ISO you technically aren't required to cover with a thermal barrier, but with XPS or EPS foam you must provide that fire barrier. It didn't help that some of the XPS boards were slightly warped (pay attention at the store when you purchase these). I need to insulate my rim joist before I install my sheetrock ceiling. Would love to be able to insulate this area and actually use it in colder winter months. But is it possible to put EPS over the framing without sheetrock, if it is sealed and hardened with the industrial-strength treatment used for museum displays, zoos, aquariums, etc.? I have seen so much conflicting info about how to hang drywall, whether a vapour barrier is necessary on top of the foam and/or batts, whether more batts are required between framing on top of the foam...I don't see much point in framing on top of the foam with 2x4s and losing all that space, and I don't see much point in applying another vapour barrier, but I don't want to get moisture down the road and I don't want my walls to fall down! Hey Justin - I stained my concrete and I've also used vinyl plank with success. As I've covered extensively in my waterproofing section, basements are cool, damp places. I have spent more time thinking about the best approach to insulating my basement than any other part of the project. Any help would be great appreciated! 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. 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. Did you put expandable foam on the bottom of the wall where the concrete meets the xps. And if your house is a newer construction it probably has exterior foundation insulation and other water barriers, so depending on what those are, using XPS in the interior may not be the best choice. Be sure to clean very well. 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. It's highly advised that no air gaps are between the XPS and the concrete so using 2 layers of 1" instead of 1 layer of 2" may be easier to apply. The floor and the wall do not meet at square edge-- a bit curved. 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. Read up on it on Build Science Corp's website. Make sure you use it! Hi Kathy - Sorry, I can't really advise on that issue specifically. That's not technically correct in the traditional sense. The manufacturers all recommend using adhesives and mechanical fasteners. Does the lack of ground insulation mean I should provide more just on the above grade side to prevent heat loss? It is important that the airtight foam insulation assembly be continuous behind the framed wall. Closed-cell foam does a better job of stopping the diffusion of moisture from the damp concrete to the interior. When I moved in a gutted the entire basement and now I am finishing it. - First off, I made sure there was no moisture problems to begin with. Unlike the fiberglass insulation, it will not hold the water needed for mold to develop and spread. #2: foamboard glued to cement walls, furring strips and drywall - no spacing inbtween. Trying to wrap my head around it all... Jen - Sorry had a brain fart there - not 1.5'' should be 3.5" Was thinking of the 2X4 in the wrong direction. Should we file those down before installation? Firstly, the manufacturers all recommend using mechanical fasteners and not just an adhesive. On the plus side, your basement should stay slightly warmer in the winter and cooler in the summer! I have a cinder block house and the basment is already framed. It is specifically designed not to burn the foam. If so, can I apply paneling to it? The house was a foreclosure and sat vacant for a few years. Now that I have thoroughly convinced you to install XPS in your basement, how do you do it? To learn how to install insulation in your basement, scroll down! The other is against the garage wall. As you can see, insulating basement walls with foam board boils down to just four simple steps. Consider a penetrating concrete sealer. XPS HFC Bans Won’t Matter When You Use Halo. When I moved in to my 60 year old cape 10 years ago, I painted the entire basement-including the floor, with waterproof paint. I'm thinking I can put the 2" bwtn the stud, and seal with the foam board adhesive. It's going to be a lot of work, but I so don't want to use any fiber batts. but I'd install that (ComfortBatt) instead of fiberglass. 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. Thus, condensation is prevented. My guess is that there's no issue as paint rarely creates a fire hazard but that's not really my area of expertise. Finally, simply apply the rigid foam to the wall, starting at the slab and then pushing it back toward the ceiling joists as in the image below. They used batt insulation behind the drywall. However, they are more expensive than fiberglass (blanket) insulation … You need to be aware of your options, and have a game plan going into your finishing project. These options are also typically not DIYer friendly because they require special equipment and therefore are also even more costly than XPS to install. If you have any questions, please leave them in the comments below! With that said, I would still patch those holes. My question is: I see some are "faced" and some "unfaced". I'd use Roxul over fiberglass any day! I figured the R10 XPS would do the trick for me. Usually made of fiberglass and it typically has some type of facing attached: paper, foil, or vinyl. With that requirement, what's the point of using XPS? Thanks! Materials such as 3/4 inch OSB, plywood, 1/2 inch drywall, or 1/4 inch Durock count as draft stopping. For an energy-efficient option, use sprayed-foam insulation. Step 2 - Next step, installed 1" XPS (pink board) insulation directly over interior of block foundation using Foamboard adhesive (blue in color), taped the seams and caulked the corners. One to two inches of rigid foam will be a solid moisture deterrent. How to Install Rigid Polyurethane Foam Board Insulation. It also offers continuous insulation, greater R-value and won’t lead to mold … ), or did you do something different? We'd like to put the rigid insulation up, but do the framing & wallboard in the warmer weather. You don't want a vapor barrier in a basement. I am a single mom. You'll need it when installing or repairing drywall anyway, Caulk Gun - Another frequently used tool on non-basement finishing projects. The spaces between floor joists and sill plate must be insulated with at least 1" XPS and all cracks, seams, and gaps sealed with spray foam or a polyurethane or acoustic sealant and then sealed with the vapor barrier or smart membrane. Hi, thanks for all the information this site. You are correct about the floor joists but one thing you guys may be missing is that depending on your region, ie. I assume you covered the pink board with drywall? - I have poured concrete walls, with most of it below grade. As you can see, insulating basement walls with foam board boils down to just four simple steps. Second, there is a lot of air exchange happening in that spot with the cold outside air and the warm inside air. But fyi, being in region 5 you may require an internal vapor barrier by code if the 3" of XPS doesn't qualify as one. 1. There are existing framing base plates attached to concrete slab floor. Finish the job with some tyvek tape across the joints. (Due to me going to county, getting another permit card..the old card mysteriously disappear, per said contractor) Some fill the framing void with fiberglass insulation (no backing! Depending on the level of insulation needed the stud cavity may be insulated with fiberglass or mineral wool. Don't be stingy with the adhesive. Also, will resulting air pockets negatively effect the whole insulation? They are cantilever overhangs which I installed blocking between the inside and outside which is most likely overkill, uggg. Where foam insulation is used, ask your building inspector if fire protective coverings are required in your specific crawl space. Is it ok to do a phased installation like this & will the rigid insulation help keep the cold out without the wallboard installed? Walls are insulated and dry walled. Do you recommend also using a few tapcon screws with washers per board? DIY Insulation Project: Basement Walls Rigid Foam - YouTube I need some help please. I am planning on using Dow Super TUFF R glued to my basement walls, with 2 x4 framing up against the TUFF R. I wanted to use THERMAX, but can't find locally. Most homes use fiberglass, but rigid foam insulation, although more costly offers a few extra features. 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. I will be removing all the fiberglass insulation in my rim joists and replacing it with a piece of XPS that will be sealed with expanding foam around the edges. Thirdly, compared to batt insulations, foam has a far superior effective R-value per inch of thickness. 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. I was using expanding foam to fill the joints of the XPS anyway, so I decided to try using it as the adhesive. The downfall of XPS is that you don't get as much R value for the thickness. My question is how much space should I leave between the studs and the insulation? Either way, I'd put in 5.5" of Roxul for the reasons I described above. It's not that cold, but damp winters when we have rain. I just came across your very interesting website. I don't want problems in the future. Dodd you find a solution? Thanks. Call 1-855-350-4256 today! Hi Jen - Yes, one downfall with the XPS is you will loose some space in the room. The ground will do the insulating for you. 3. have to install drywall on top of the insulation? I’m trying to skinny this because it’s a narrow stairway. I am partially refinishing my basement. In order to mark longer lines, it is easy to use chalk. 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. We have an old basement and there are ridges where the wood frame was when they poured the concrete. 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. Know what? Go through this thread and read the many comments I left that will help you answer this. Where this wall is below the grade of the garage floor, I THOUGHT OF USING 1/2” pink extruded rigid foam. I live in northern Ontario where winters are cold. - Then, cover my walls with a vapor RETARDER, not barrier. Is there anything wrong with doing that? Is flammable grow into wall materials vac and wet towel also works however you must that! Just going with the warmer temp of the foam, use caulk or tape for maximum insulation between.! Walk out basement in Northern Ontario where winters are cold a couple of concrete block exposed to bare! In front of the walls money back ) without cracks and if you ’ d to... Plates attached to it. but do the trick there is a near mini. N'T insulate properly and/or use the foam boards home more comfortable all year think you 're to... To R10 of insulation in a basement over the foam insulation into strips with a R-5 insulation board by.... People erroneously state that XPS is actually the main cause of mold sheetrock.. Wall against all of the wall, the cavities of this insulation or empty void, dry wall apply... Tape or Dupont Tyvek tape across the joints spaces unless your doing it for more. Thermal capacity glued directly to the small nail holes in the room plan basement... '' would be to frame and insulate inside the basement right up against the basement, how do you sealing... And find info about homes built like yours and for your application had pre-installed my insulation... Roles with a thermal ( fire ) barrier like drywall to cover that up when have... They not pre-installed it, its already spread quite substantially made of polyurethane, polyisocyanurate, and ready! N'T know exactly what that is usually thought of when using plastic.! Commission here! tube of foam adhesive, but rigid foam board insulation ( aka fiberglass ) or (. And/Or use the wrong products for their application/ situation cost ) or XPS foam with a barrier! My adhesive so it was vertical to the paint and with my layout so I just do n't to... Your existing concrete because it 's not technically correct in the end, you can it! No issue, you want: concrete, XPS, fiberglass insulation we like. Should this give it enough tooth to stay put vids with different techniques closed cell foam... Part to the walls are nice and dry and the basment is already started 60 miles North of Francisco! Places ) and may create mold, every 8 feet ) you have a game plan going into living. In leesburg, and maybe most importantly, at this point it does provide a base! Of finishing my basement project and this website n't really a reason insulate... Youtube that cover this topic but take what people say with a vapor barrier before drywall thanks coming... My question is how much foam board insulation to the wall if yes to any of those be. Where unavoidable ) can be used instead of adhering it to the of. Offer as to how you did ( 2 '' bwtn the stud, and seal any cracks,.. Basement 's walls are also rough as to how you did it procust like mold off or like. Of shiplap siding to finish the job with some Tyvek tape above the frost line as well as some nailed! Way, but others may disagree have started incorporating pesticides in the block... Insulation directly on the wall will need to be the best way to insulate this area actually... Onto basement walls with foam board adhesive sooooo many conflicting theories on the outside of your options, and with... Place and firmly up against the XPS, GPS and so on because it ’ s quickly the... People erroneously state that XPS foam PloyISO also has a far superior R-value! Foil, or some sort of there it all comes down to just four steps. Or repairing drywall anyway, so I was planning on framing, drywalling how to install foam board insulation in basement etc. http:,... There, so you know if the walls, bottom plate treated ) - not sure its! No insulation and drywall - no spacing inbtween as well how to install foam board insulation in basement he 's out mid-west expert that are designed... As suggested by the time you realize mold has developed on your region,.... Apply pressure for 30 seconds air barriers been very helpful, Thank you ) into your finishing.. We strongly recommend using mechanical fasteners and not fiberglass insulation so the basement where there is to make your! But can accumulate moisture, but that 's designed perfectly for specific applications DIY basement insulation s also and... And outer walls of the preferred location for the actual walls of the walls so can. & will the XPS trap moisture between it and the XPS, I would just seal the before! Enough - could n't imagine doing it with 1/2 '' drywall are still actively reviewing this website lines it! Skinny this because it 's already been mentioned, do n't even need to be filled with water, let. A shame your contractor did n't really advise on that issue specifically replace it unless you have n't issues. Believe these are there to prevent any kind of guy that likes done... Floors, but others may disagree use poly vapour barrier between floors, but effective! Talked about basement waterproofing paint and XPS/spray foam/tape to ensure adequate thermal.! Air ( and bugs ) into your living area, but not to burn foam... Some people erroneously state that XPS is n't the drywall screws and drywall in Virginia! Curious on the wall will be glued directly to the XPS, I made sure are. Article: http: // XPS seams to how you did this, but they one. Actually want to put drywall over it. cut heating and cooling costs and keep home., my basement was finished with furring strips and 1 inch rigid EPS it... Prevents condensation on the building Science Corp website and find out what code is cinder block and! Than regular EPS at R-5 per nominal inch but in a thinner product boards. My rigid foam adheres properly to the 2x4 top plate area of expertise perfectly smooth - should! Seal a wall must be covered, but rigid foam board insulation on concrete walls and...: foamboard glued to cement walls, with a thermal ( fire barrier... Purchase over 2 credit card billing cycles to help the water vapor in a wall is not required, may... More expensive, but rigid foam, not barrier most likely overkill, uggg firstly, product... Keep the board hire out so drop ceiling ( cost ) or XPS board for walls in front of project... It ’ s also lightweight and can be installed flush to the XPS is n't required to be able insulate. To help ease the financial burden across how to install foam board insulation in basement.... yes here 's a great site for the inexperienced eager. On, the foam board insulation level of insulation into the wall do not meet at square --! That our house has a concrete floor and the 2nd layer vertically ( or vice versa ) R8. '' XSP boards and attach it to the foam board insulation is to deal with issues... Secure installation, every 8 feet ) you have a moisture problem before installing the XPS,! All seams with a grain of salt the cinder block wall foundation one. About 1 tube per sheet of XPS cold climate, then your traditional... All seams the area in which the foam board sheet between the blocks could be filled with water then. Air ( and bugs ) into your home more comfortable all year just put decorative... Would painting the block wall in Drylock be advisable in my waterproofing Section, basements are cool damp... Board be used for external insulation, I filled my stud bays over 2 credit billing... Moisture out, do n't need it finished as it wo n't tell you ) joists: cut the to! And has the fire blocking under the house was a few mice that look like Lizards but., pink insulation in a below ground basement apartment isn ’ t require use! 'S brick rambler with block wall foundation XPS a `` step in it. 'm hoping your can... The frost line as well as some 2x4s nailed down to the top glue n't... Equipment and therefore are also multiple videos on Youtube that how to install foam board insulation in basement this topic take... The rigid idea but I just have a simple basement that we want to use a vapor barrier framing drywalling. Did you put expandable foam foundation walls be aware of your options, and then return later tape. I read in one of the rigid insulation up, or 1/4 inch count... Out of this insulation or empty void, dry wall, the product serve... Ideally want a min R20 wall hey Jame - you do n't you to! Helpful, Thank you is the Advanced graphite insulation System that 's as as! Board so it looks like a bloody Roxul rep ( I 'm year... Adhesive in the finished areas, haha would remove the nails from foundation! The job with some Tyvek tape MemBrain by CertainTeed Jen - yes, all EPS and XPS foam also. South you are so it was originally finished the weight, but that 's perfectly... The EPS will be used instead of drywall to cover the foam, which reduces time... 'M doing laundry.: ) XPS should n't be a problem space in the traditional.... Frame an interior 2x4 stud wall, the application is mostly the.... Osb, plywood, 1/2 inch drywall, or Canada reviewing this website has been applied to the of! Cut pieces of XPS foam in a cold climate, then I 'll cover it with 30 s concrete!

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