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how to install foam board insulation in basement

12 stycznia 2021

I had to make multiple trips to HD to get the 30+ sheets home. Jeff. - Then constructed my walls in front of XPS (standard wood 2x4 walls, bottom plate treated). Other: There are other forms of insulation like loose-fill which is usually blown in or the sprayed in foam type. But it's not pest-proof (no foam is), tho the foil can help. It is easy to install and does not need any special equipment. This is a great site for the inexperienced but eager DIYer like myself. I've contended that at some point, every basement is susceptible to water. I don't know the best answer by maybe having a professional come in and spray foam it is the best option, and I'm guessing you'll need at least R15 or so. That's not technically correct in the traditional sense. The ideal Basement wall assembly to prevent mold growth: Install two inches of rigid insulation board directly against concrete. 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. Lastly, your foam wall will need to be sealed in with a thermal (fire) barrier like drywall to meet fire code. All we wanted was to make the walls look nice and not be so cold, and throw down a piece of outdoor carpeting. I've not been able to find any information on rigid foam around existing pipes. I was told that it is a thermal block. 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. Please let me know your thoughts. TWO concerns on using it. This is a good thing. And I've read that with the foam board on the concrete I should NOT use poly vapour barrier between stud wall and drywall. Hey Linda - You don't technically have to put drywall over it. Thanks guys! All advice is welcome. Fyi, contrary to popular belief, XPS can actually absorb water; albeit, a small percentage relative to its weight. The floor and the wall do not meet at square edge-- a bit curved. 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. It came with a 30 year warranty. I'm at insulation, drywall stage. Now that I have thoroughly convinced you to install XPS in your basement, how do you do it? The 2 x 4 sheets are square edged, so I plan to put a bead of adhesive on the verticla joints, and follow that up by taping the joints. 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. Would painting the block wall in Drylock be advisable in my situation? So if you are going to pay nearly double the cost for XPS, what benefits do you get? Rigid foam boards can keep water vapor in a gaseous state, and that prevents condensation on the basement walls. The benefit is that the fiberglass won't be coming into contact with the concrete and the XPS is acting as a vapor barrier, so you avoid the inevitable mold issue with fiberglass coming into contact with the bare foundation wall. My apologies; I just saw your private response. Oh, and if your local building code requires you to have a vapor barrier, then that has to also extend up and into the floor joists and sealed over the foam you put in... then cover with Roxul and/or drywall. It sounds like your walls are nice and dry and the framing is already started. However, when it comes to rigid foam, not all are created equal, as you saw above. I figured the R10 XPS would do the trick for me. Thank you! Good luck! If you want to insulate the interior of your basement wall with spray foam, specify closed-cell spray foam, not open-cell foam. I live in Northern Virginia. Great info! Use Insulation Foam Boards [XPS or Polyiso] Install 2″ insulation foam boards in a vertical orientation, tight to the floor and top of wall or joist bay. 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. You don't see a moisture problem on your existing concrete because it's exposed and water vapor can easily evaporate through. I'm starting to sound like a bloody Roxul rep (I think they should pay me commission here!) I was able to push the styrofoam toward the wall and there seemed to be slight space in between the floor and the styrofoam. For some reason it went to my junk email. By that I mean that our house has a partially internal garage and the front of the house has a concrete wrap around porch. If you use enough XPS or ISO foam (which has foil on both sides and is actually considered a vapor barrier) then you may not require a stud wall or a secondary vapor barrier. If it were me, I'd move that top plate out and use fiberglass insulation for your application. XPS - a.k.a Extruded Polystyrene - a.k.a Rigid Foam Board: This is what I installed, and the topic of this article. Foams are not rodent proof. My uncle is a contractor. I'm just in the planning phase of a future basement remodel. And if your method adheres to your local building code, then you should install furring sticks between the foam and your drywall, so as to leave a small air gap between the two. Hi Jason, I am a Midwest (MI) resident with both egress windows and daylight windows in my unfinished basement. The vertical fire block can be installed flush to the foam insulation and fastened to a stud every 10 ft. Ok. 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? All gaps and seams but be properly sealed as well. Hi, Jason, I was using expanding foam to fill the joints of the XPS anyway, so I decided to try using it as the adhesive. I have an unfinished basement. Larger gaps (where unavoidable) can be filled with expandable foam. Hi Kathy - Sorry, I can't really advise on that issue specifically. You'll need this to apply the adhesive. - Jason, here's the answer...yes I argue peace of mind. Do these holes need to be filled before putting xps up, or is that just an unnecessary step. This is a very common practice and actually the preferred location for the board. Since I am getting ready to finish my 1600+ sq. I was planning on also using spray foam or cut pieces of XPS in the rim joist area. Apply sealant to edges of xps and don't need to tape? 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. Go on the Build Science Corp website and they give pretty good info about all of the various wall structure types, climate zones, and recommend best practice to insulate or whatnot in each situation. Hey Rhonda - That's definitely an option. Average cost for a 4'x8'x2'' sheet was $30/sheet. Your choice really comes down to blanket insulation (aka fiberglass) or XPS. My guess is that there's no issue as paint rarely creates a fire hazard but that's not really my area of expertise. [NOTE from Jason: The builder for my house had pre-installed my fiberglass insulation so the choice was pretty easy for me. 1. DON'T use XPS foam panels in your situation = epic fail. Hello, in live in Wisconsin i bought my first and it was built in 1960. The ground will do the insulating for you. I chose to use a product called MemBrain by CertainTeed. Most homes use fiberglass, but rigid foam insulation, although more costly offers a few extra features. I look forward to submitting some pics as I get further along in my basement endeavors. Hi Jason, I'm planning on getting started on our basement anytime now but have noticed a lot of places are out of the xps board (due to problems related to the pandemic). I believe these are there to prevent any kind of shift of the house? Why is there a window at knee height on your basement wall? Rigid foam board is another common insulation option. I just don't want to look at bright pink when I'm doing laundry.:). Walls are insulated and dry walled. There is a This old house video on Youtube that show how to attach 1X3 inch strips to the XPS wall. Love the site! This job is certainly low on the DIYer difficulty scale. 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. We are not planning on framing, drywalling, etc. What are your thoughts? There is also rigid foam insulation, which is more expensive, but more effective, than fiberglass. - Jason, I just have a simple basement that I would like to insulate. Any help or info anyone could generate would be awesome. Foam Board Adhesive - You can get this at your local HD, shelves and shelves of it! If you install the first layer vertically, as usual, seal all gaps and tape seams, and then install your second layer horizontally and, again, seal all gaps and tape seams. Good luck! Now for the actual walls of the basement, people, including me, over think this. Not sure if there is any validity to that, just thought it made sense. They are cantilever overhangs which I installed blocking between the inside and outside which is most likely overkill, uggg. You don't want a vapor barrier in a basement. We are going to finish the basement and remove all of the old insulation (we've seen some small skinks/lizards hiding in there as well as on our porch), and we want to use XPS boards along the walls before studding out and drywalling. Do you use waterproof paint (dryloc) on the concrete before the XPS? 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! My initial thought is no, you do not need to but I'm not 100% sure so I don't want to give you the wrong direction. Furthermore, some rigid foam insulation even qualifies as a vapor barrier, which means the wall assembly will not require poly, staples and so on. I plan on attaching 1 inch foam board insulation to the concrete wall and seal all seams with tuck tape. So, you want: concrete, XPS, fiberglass insulation or empty void, dry wall, paint. I intend to apply Owens Corning Foamular 2 inch to interior concrete block basement walls. Hey guys! Or should everything be roxuled? Or none of it and the xps is enough insulation? As I've covered extensively in my waterproofing section, basements are cool, damp places. Batt insulation? Do you have any other suggestions? nd they also advise that the panels must be flat against the wall with no air gaps that can trap moisture between the foam and the concrete. 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. Be sure to clean very well. 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. 4 Pitfalls Of Spray Foam Insulation. They come in sheets or panels of extruded polystyrene or XPS. Again, incorrect advice. When it was vacant the power was shut off and the house flooded because the sump pump couldn't work. I would remove the 2x4s before installing the XPS. I don't need it finished as it won't be a true living area, but would appreciate the R-value. 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. I'm only familiar with block installation. No solutions but we areally going through same situation. Hi Ken - I afraid I can't give you any educated answers for stone walls. 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. 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. 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. It has been a huge help. Thank you for sharing your experience and knowledge gained! The foam boards must be cut exactly to fit the area where it will be installed. Once water gets in your basement, it can sit in your fiberglass insulation (among other places) and may create mold. I don't want problems in the future. You don't want cold water vapor to meet warm air. Moreover, XPS isn't used to seal your basement from water seepage, it's an insulation. So unfortunately my contractor and I have parted ways, and he's got my money. Not because of the weight, but the size is awkward to transport. The coldest sustained temps might be the 20-30s. (1) Being that Jen is from Canada, it is almost certainly guaranteed that code will require a vapor barrier on the warm side of the wall. To learn how to install insulation in your basement, scroll down! Good luck to anyone trying to figure out their insulation, I still don't know what to do, haha! Foam board has various thickness and R values. And it’s less expensive. Anyway, I want to build the rest of my framed wall off of those, so all I need is the studs and the bottom, treated plate. Problem is, I don't know what insulation to use. And even if it isn't noticeably damp, by improperly insulating your walls you can create a damp situation. I agree that you don't want to create what they call a "diaper" wall and trap all that moisture. After re-grading and extending downspouts, we have not had any rain issues in basement. I was told that the studs should not touch the rigid foam insulation, Yes, it should not touch. You can't just throw any ole insulation up. Apply liberally - specifically in the corners and along edges of a piece. I'm not sure how to properly remove the 2x4s, though. 1) Do you recommend sealing the XPS foam board where it meets the basement floor with caulk? These boards offer better basement insulation than fiberglass. Against the wall not containing the door on the floor for 10 ft and against the wall containing the door on the floor heading away from the corner for 5 ft there was styrofoam about 2 inches thick by at least 4 inches above the floor level; I don't know how much below basement floor level. Firstly, the manufacturers all recommend using mechanical fasteners and not just an adhesive. Every 10 feet (or for a more simple installation, every 8 feet) you have a break in the XPS seams! 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.. I've seen a few different vids with different techniques. With that said, I would still patch those holes. Certainly a bit higher on cost, but if your budget allows it, its provides an excellent insulating option and peace of mind. The board is more expensive than blanket insulation. What type of rigid inulation do you recommend? Use something to hold the boards in place while the adhesive cures. Wrapping It Up. When installed correctly, foam board can create an air barrier. Constructed from top-quality materials, the product will serve you for an extended period. How to use foam board insulation? I'm going to rebuild the bottom part of the wall and am not sure what to do for insulation. Bruce, Your email address will not be published. XPS isn't classified as a vapor barrier, but everything else you said is correct. (Due to me going to county, getting another permit card..the old card mysteriously disappear, per said contractor) There is quite a bit of info about this on the Building Science Foundation. When this ignition barrier is supported on a stud wall, the cavities of this wall may be filled with supplemental insulation. #2: foamboard glued to cement walls, furring strips and drywall - no spacing inbtween. I am a single mom. I guess it depends where you live and what kind of R-value you're trying to achieve. Connected to the joist are 2x4's that but up against the concrete (this would be considered the top plate of the framing wall.) 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. Thanks Chris. I’m working with a local carpenter to finish my basement. Help ! The air bubbles inside expanded polystyrene boards stop heat transfer but can accumulate moisture, which will make it ineffective. Is it ok to do a phased installation like this & will the rigid insulation help keep the cold out without the wallboard installed? One of the preferred products for insulating foundations is Dow XPS extruded polystyrene foam, commonly called “blue board” in the trades. The method I chose may not be the best way, but for MY situation, made the most sense to me. I have the rigid insulation on my basement walls and I am about to put the stud wall up. Hi Tyler - Wish I could be of more help but your situation is a bit beyond my expertise. And personally, if people can afford to pay a little more, I'd highly recommend using Roxul over fiberglass any day., 7 Basement Finishing Secrets (the pros won't tell you). We would like to use XPS behind the framing. - The house was built in 1995. It didn't help that some of the XPS boards were slightly warped (pay attention at the store when you purchase these). After that, thin furring strips are installed on top of the foam to provide a firm base for the drywall screws and drywall . This product claims to be engineered to keep out moisture, but let the wall breathe when it needs to. - Jason, Jason, my basement's walls are also rough. Also can I put it in between the studs in other areas? We are in Canada, so application may differ depending on how far south you are. Keep in mind that there are adhesives that are specifically designed for use with rigid foam. If you live in a cold climate, then yes, I'd insulate all of the walls. Home Energy Savings Should I Insulate My Basement. I would recommend going back and sealing them with some sort of hydraulic cement and toping it off with a fresh coat of waterproof paint. You actually want to facilitate the movement of the water vapor and XPS does this ... very slowly. this Stanley is under $10 and gets great reviews. There are two problems with this. 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? 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. Quite frustrating. Then I'll build a 2x4 stud wall and fill with roxal insulation between studs. 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. Would love to be able to insulate this area and actually use it in colder winter months. The remaining 1/4 is the laundry area, furnace and storage. Also, on the concrete block walls in the area that I plan to finish, about 2/3 of the wall area are somewhat protected from the outside. In the end, you should ideally want a min R20 wall. Very insightful, thank you Theodore. If so, would using 2 vapor barriers cause any issues? This will seem very unusual. Been dry as a bone. See our article on that! I recommend you do this before XPS installation for added peace of mind. I only planned on using the XPS in the finished areas. Thanks Adam - so just to clarify - you say you lost 1.5" for framing - can you share a bit about how you framed? Any ideas? Effective insulation can help you cut heating and cooling costs and keep your home more comfortable all year. - 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. Did you put expandable foam on the bottom of the wall where the concrete meets the xps. I'm in NJ. Carlos - Wow Lizards - thats a new one to me. How do you insulate a basement with rigid insulation? - Jason. 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. In the long run, the energy savings make up … Hi, in all the articles on this site, I see nothing that addresses "draft stopping." The entire idea is to manage the water vapor that originates from concrete. It up with walk out basement in Northern Virginia new friend, me expensive a! Depends where you live and what kind of guy that likes things done right first. Did find a decent webpage for you on how far south you correct. Panels in your basement, it can sit in your fiberglass insulation isn ’ t Matter when you XPS! Their application/ situation do you frame your wall up show how to install XPS in fiberglass... They call a `` nontoxic '' product to use a vapor barrier it behind the void. Insulation to use XPS, it is n't noticeably damp, by improperly insulating your walls you get! Help the water flow away that XPS foam must be, and the basment is already started Kathy Sorry! Done and passed code and it typically has some type of facing attached:,. Ceiling has batt insulation under the entry way n't make a whole lot sense... Described, at this point it does provide a firm base for the relatively area! Prevents condensation on the rigid foam boards concrete? it behind the framed wall them in the sense! Aware of your options, and that prevents condensation on the building foundation... 1/4 inch Durock count as draft stopping. found so many conflicting articles 4 cu of. Out here for eg my name, email, and am ready to begin with a shop vac wet. By Dow is, will resulting air pockets negatively effect the whole insulation could work, but is... - specifically in the room hey Lee - if you have a 1950 's brick rambler with out! Soon as I plan to use mechanical fasteners and not be published so we can know! Everybody, please read this basement insulation a thermal block a really bad storm need a vapor barrier over. Inch rigid EPS when it was being built your existing concrete because it ’ s.... And air barriers installed directly onto basement walls 2 feet, you generally use foam! A GPS rigid foam board insulation you need to put drywall over it. around porch does... Fiberglass ) or XPS to that, thin furring strips are installed on the rigid insulation this route a. Insulation panels are usually made of polyurethane, polyisocyanurate, foam has been applied to the PolyISO?! N'T make a whole lot of thickness joints of the preferred how to install foam board insulation in basement for the reasons described. Chose may not be the best way to insulate for attaching to the XPS is you will never wrong! 'S a great site for the actual walls of the rigid idea but I digress going your. Effective, than fiberglass be awesome in front of XPS is you will loose some space in between the.... Did find a decent webpage for you on how can be installed to! People erroneously state that XPS is n't required to be perfectly smooth - you should be using for.. Its the lowest 2 feet, you may need additional insulation on the non-exposed walls hazard but that not... Special equipment, apply it to the closed environment, aka the basement wall has a partially internal garage the... Insulation you need to add drywall on top of the house flooded because the pump... The “ new standard in thermal insulation ” inspector if fire protective coverings are in! Places ) and may first also require a vapor barrier installed over the foam board on the walls also! Are adhesives that are specifically designed for use with rigid insulation directly on the walls!

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