My question is about the concrete slab floor. Is there anyway to get some sheathing on the back of that 2×4 wall so when you spray it the air gap will stay? Good point! – Assuming the cover goes on the outside, I’m thinking you could install 3 inches of foil faced polyiso insulation in the “box”. If so which one would be the best type (eps, xps or the foil facing?. We run two dehumidifiers constantly, which uses alot of electricity. For foil faced polyiso i suggest you get a good quality foil tape (used for duct work…..but NOT duct tape). I am wondering what your opinion is on the following. I wouldn’t special order anything. Could MGO board or drywall be glued directly to the foam board? #3) **** Do you recommend roll style insulation in addition to the panels (assuming I can use panels at all?) Anna – Are you doing this in an unfinished attic? 5. Sue – Typically on metal buildings the roof insulation in done during construction with one or two approaches. I’d install at least 1″ of the polyiso, tape the seams, then install vertical strapping to create an airspace, then the siding. If that’s the case you should consult with a structural engineer before moving forward with your project…enough of that…. I live in Indiana and we have a large difference in temp seasonally. Eric – What you are describing is a “hot” roof (unvented). The meeting of the ceiling & wall is curved, so that has to be taken into account. Would it be better to use xps against the wall and use the eps (rather than fiberglass) for insulating between the studs? You could also check with the manufacturer. Another quick question about siding selection. Any suggestions? Kim – Foam board insulation can be used anywhere fiberglass can be used. I was thinking of adding 1/2″ polyiso foam covered with dry wall to the interior of the two ezposed walls. Thanks for your help and suggestions. Also can I double or triple stack sheets to get added R Value? We initially planned on using fiberglass batts to insulate it and maybe some blown in for the attic space. Doesn’t know how to go about engineering it without sheathing. I’d NEVER use polystyrene in a basement as it’s an open cell foam product. Rich – I suggested the foil faced as a bit of safety insurance. Corky, 1. Ventilation is essential to a properly functioning attic. You seem to have the best understanding of a confusing topic. In theory it should work. todd I live in upstate ny I am putting a 2nd floor on my house 2×6 walls can I use foam board along with 6in faced fiberglass to get higher R value and is it better to install foam board on the interior or exterior or both and what kind of foam board do i use. Three inches of polyiso may be a little overkill compared to three inches of blue/pink board. I only have 2×8 ceiling joists and was wondering if I could put either foil faced polyiso or blue board poly directly against my roof sheathing underside, then spray foam and seal all of the gaps? I guess I would lead towards applying the foam on the outside of the house. If the polyiso is foil faced does that protect it against moisture and act as a vapor barrier. Also, I turn the heat off in the condo when I leave for work and back on in the evening. Thank you very much for your help! Will the foil act as a vapor barrier or will i need something additional? Chris – Foam will work well there as well. My question to you is what would you recommend for us to do? These are great comments. 2a. The answers vary depending on whom you ask. Recently purchased a 4 level, approx 3000 sq ft home with a sandstone exterior in upstate NY. Stan – Frankly I’d blow in cellulose between the T&G and the ceiling below it. 4. It is mandatory to procure user consent prior to running these cookies on your website. Typical foundation around here is 8″ minimum concrete wall. It is somewhat insulated from the outside since there is a slab on grade installed at the top of the wall. Please advise. Spring is the perfect time to plan these projects…, New DEWALT Job Site Table Saws Models DWE7480, DWE7490X, and DWE7491RS DEWALT recently introduced a new line of portable table saws that include significant updates and features. So the Tyvek plus the tape sealed foam would not inhibit the wall’s ability to breathe. I think it’s far more important to seal the seems (most often specified this way by architects) to prevent water from getting from the outside to the inside. I’m insulating the attic on my 1910 craftsman in Seattle. Ryan – Trapped moisture behind the polyiso isn’t of concern in my opinion. the framed walls have a paperfaced R 19.the basement is unfinished and has no drywall.The slab was poured over 2″ foamboard and plastic on top as a vapor barrier. Cooling in Summer won’t be such an issue. Over the foam. But experience suggests otherwise! Possibly could be a negative pressure issue? We are currently building a new home in Indiana. I understand that it will certainly help with the temperature control in the rooms and I know it is recommended for that point alone but, is it against building codes to not install it as well prior to drywalling? Type your search KEYWORDS In the Box Above. We have a 400 sq ft sunken by 4 inches -section designed for the theater that Im concerned about especially with moisture since immediately upon digging-there was water pooling but eventually desipated but occasionally is there anywhere from 2-4 inches. We also use third-party cookies that help us analyze and understand how you use this website. I’m thinking that it might not be necessary to do the north side or the northeast gable due to the small amount of sun exposure they get and the fact that none of this will be air tight. My concern(s) are that I do not want to add furring strips for solid siding attachment, as I want to secure the siding directly through the rigid foam. Do I put wood extension under the window mounting flange to make them even with the insulation or run the insulation under the flange or over the flange? My bedroom is on the north east corner of the house and I have about 20 cold spots on the ceiling along north and east walls with water. I am planning to insulate the walls of my Illinois basement with the 2″ XPS. Appreciate your answer. You’ve got to address why the levels are so high (identify sources of humidity, showers, dish washing, cooking, improper vented appliances, etc) and deal with it. In some situations the bottom of slab is an inch or so below the top of footing, in that situation the insulation would stop at the edge of footing. However, special care should be used when insulating…, Get 10% of with a Lowes Coupon NOTE: Home Construction & Improvement is not affiliated with Lowe's. The company I work for bought a large commercial building. I have a feeling it’s not bad at all. Obviously if you do things will be even better down there but it’s not mandatory. There is not even any plywood under the exterior sheathing / cladding / siding. It’s not like open cell I’ve used in other applications. I have gained confidence after watching some of your work/guidance. We’ve built several homes in the last two years that use less than 50% of the energy that previous homes use. They clearly weren’t eating it (there must have been something much tastier in that wall), but they certainly chewed it. I’m trying to avoid ripping out the plaster and lathe. 3. Jeremy – I haven’t used one of the kits and I hear they only work well for small areas like a rim joist. There is an air gap, then lathe and plaster. That will also help to reduce your energy bills. No vapor barrier. Hello, I am about to insulate my 4000 sq ft ceiling with 3/4 inch tyvek foam which comes in sheets of 4×8. Please feel free to contact me if you have any questions, suggestions or you'd like to inquire about advertising on this site. Generally very moist most of the year. Does anyone manufacture thicker sheets of extruded polystyrene? So if the thickened slab is a foot below grade, and you have 2 inches of foam under it, you’ll likely defeat the frost. XPS is a closed cell foam board and a far superior choice for this application. Seeing that you’ve gutted the space you have lots of options. 2×6 construction and have the building weather tight but framing exposed inside. To get the width that I need. If I put extension jam under the window flange, how do I seal it properly? I had to frame out my basement walls 8″ away from the concrete walls on all sides since the house has alot of conduit and pipes. Installing a dropped ceiling is relatively simple, because you first install a lightweight grid of aluminum and then lay the ceiling tiles or panels on top of it. I see no need for a vapor barrier Kraft paper. If building inspector requires the faced would that be an issue with double vapor barrier. You get the advantage of the thermal mass inside, to moderate temperature changes, and it doesn’t cost you any more. Installing foam over the drywall would be bad. Tom – It’s such a toss up. We will use a good diameter rubber tube seal between the boxes and the exterior walls. Not sure I understand your other question. Is there something I’m missing? It seems like a no-brainer but do you think I can find it? The Foil is a blocking on the faces only but a silicone coat may not be UV blocking at all. I plan to put 2″ XPS under the entire slab, but I’m debating whether to put an additional 1/2″ foil faced polyiso board on top of that. When attaching the DOW product to the wall, it isn’t perfectly flat. Foil will not burn, but it does heat up. But since I was not familiar with concrete sealers, I wanted to learn more about it. The rafters are 2X4 spaced 24″ apart. As far as adhering the insulation, do you just use construction adhesive to install the foam boards, and if so, how do you hold them tight to the foundation wall? 3. He said he doesn’t know how to flash them with foam. Is the polyiso strong enough to support the weight of someone walking on it, if there is a some kind of covering? I have personally seen attic condensation on EPS that produced visible water flow and serious problems. It would be a huge fire hazard and frankly 1/2″ of foam isn’t going to do much of anything. You want the insulation to be as close to the outside as possible. I think if you’re using batt insulation, with a vapor barrier, I’d probably NOT tape the foam. I am looking to use this XPS as a thermal break between the concrete floor in my basement and the subfloor. I read you comment about BIBS and wondered if this can be blown into the wall cavities? 2 inches of foam on a roof isn’t nearly enough in my opinion. I think I would need 2 or 3 4×8 panels to finish it. Anything you do will be better than it currently is :) Good luck. Is this too much insulation, and could it end up causing problems in the future? I’ll look at the strapping. Thaen there would be a problem of how to secure the second layer of drywall through the foamboard. There are more and more folks spraying a thin layer of foam inside the cavity followed by fiberglass. I hope you’ll consider signing up for my FREE Weekly Newsletter so you can keep getting great Home Improvement Tips. If you’re looking to do all the work yourself then you’ve got a couple options. I have read that a fire barrier needs to be added such as drywall. I have already cut 1″ polystyrene sheathing to fit in between the 2×6 joist for ceiling. Concrete typically doesn’t get really that hot either. I live in Montreal. However, your system will probably work fine. Then i would add a layer of 6mil poly and then sandwich this with another layer of 1″ rigid. what’s the thickest individual sheet / board insulation? There are many tapes on the market now that stick very well..just be sure it’s not duct tape! 3. Thanks Norman. Mind me asking “why” or what application this will be used for? A dehumidifier can remove lots of water from the atmosphere of your basement to dry it out, and running a dehumidifier in your basement is probably a good investment. Do I use EPS? – Will the box be installed on the outside or inside of the building? If I lived in Alaska I’d spend every dollar I could on insulation versus other nice to have things like nice countertops, etc. Would I need a dehumidifier? I posted earlier in May above. Obviously there are times when it’s no practical. If yes to both this approach will work well. We are building a 24×38 detached garage in Illinois and trying to determine the best insulation option for our use and budget. Hi Todd- I’m building new construction in the fall and was wondering what your thoughts were on an ICF basement vs concrete block. Thanks Mel. But opting out of some of these cookies may affect your browsing experience. All of the joints in the foam should be sealed well. 3. I am building a new house and putting radiant heat in the concrete slab, which will be the finished floor. Is Polyiso the best way to go here or is there a better solution to insulate the roof? You didn’t comment on whether Tyvek would be needed over the insulation under the new siding. In a perfect world I would simply add 4″ of polyiso, seal it up and be done with it, but there are complications. THere will be some kind of insullation inside the studs. The channel makes for a VERY good sound deadening detail. Both have the same R value and the same compressive strength. I use XPS on the basement walls because it works great in direct contact with the concrete. Unfortunately, I never get to see the costs. How about the ceiling above this room. He never did answer the question I asked. Todd, I am insulating my Seattle basement . Also, who sells the material at a reasonable price? This is probably the best approach and it will surely seal things up, stop vapor and air infiltration and likely be the quickest. Good luck. So, the cold block wall can transfer that cool temperature through the foam. I have installed metal studs 16″ OC and the basement is moist not wet. I figured that I would add 3″ on top of the roof and 3″ below as the ISO is rated at 19.9 for the 3″ thickness. Not so much on retrofit repair that I saw (or understood…). Hi, I am building a new house up in Maine and currently the inside is unfinished. Todd, I have a below grade,uninsulated,mostly dry, basement in N.H. that I would like to insulate. If not damaged, can we still use the original foam and will there be any problem arise to consider. I have three questions (1) can I use Polystyrene / Polyisocyanurate Insulated sheathing (1/2 inch or 1 inch) to on block (2) have French drain & sump-pump, it gets busy when rains, any special suggestions (3) do I have to put framing and insulation, and drywall??? Ryan – You have two main issues. Add to that the foam board being a vapor barrier, and the breathing of the existing walls to the exterior is impaired. 2a. Yes, the foil is moisture-resistant, but according to Dow, none of their rigid insulation is a barrier for water vapor. There don't seem to be any ready solutions. Thanks, I have been enjoying reading your answers. Your humidity is so high that as soon as it hits a cold surface it condenses into water. Our climate is not as harsh as Canada and I obviously am trying to be cost effective. A savings of $2400/year would pay for about $48,000 greater expense in construction. Do you have any suggestions or comments? The 3/4″ will certainly help “seal” up drafts. Remember that water leaks at foundation can be under quite a bit of pressure, almost like plugging a dam from the air side….not possible. Hello, I will be insulating my basement concrete wall. The house I worked on has plaster walls, Kraft-faced R-ll insulation, shiplap exterior sheathing, and 3 layers of tar paper. Would this be a bad idea? Clear, concise and direct – exactly what I could not get locally. It really should be covered by a siding product. I am afraid moisture will be trapped between the OSB and the foam board. Sounds like they found it was a good material to nest in. One follow up. The exterior walls are currently double plank with 1 inch E.P.S. I do not recommend having fiberglass in contact with concrete or block. Installing exterior insulation is MUCH better than interior because it’s continuous. But just to clarify, does the 2 inch XPS go on top of the footers as well as the gravel or does it go on top of the gravel but level with the top of the visible footer? Yes, it is extra protection but it also controls the smell of bare concrete and the dust. Your proposed insulation would be 5.5 inches of cellulose at 3.5 per inch + 2 inches of polyiso at 7 for a total of R33. Where the walls were rebuilt, the walls have 1/2″ OSB that was covered in Tyvek. foil facing up? Keep it clean. Next we created a 3 inch perimeter along the eaves and gable ends with 2 layers of 2×4’s. Preferably R49 or above. I’m presently insulationg my basement with 2″ foil-faced polyisocyanurate glued directly to the blocks. Thanks for the great blog. (I hope this make sense). Would it offer a vapor retardant? I am wanting to re-insulate a vertical wall which exists between a finished ‘attic’ and an unfinished attic. It also helps create a far better air barrier. Basements in all Townhomes, Refrigerator & Freezer, Plush Carpeting $1,015 2br - 865ft 2 - (19400 South Glen Boulevard, Trenton, MI) pic hide this posting restore restore this posting What would you do if it was your place and you were looking forward to that extreme of cold? The trailer is smaller than I wanted, so the loss of even a few inches is critical. I’m in central Indiana with a very dry poured wall basement.
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