I am stumped on this situation. Concrete doesn’t need to breath. It’s a DOW product and it’s typically sold at more traditional building supply / lumber yards that deal with commercial construction as well as residential. I noticed some moisture under the PT 2×4. Should i just sprayfoam and leave it uncovered? In regards to (4.) The new line includes 3 new models; DWE7480 - 10" Compact Table Saw, DWE7491X - 10" Table Saw with Scissor Stand, and DWE7491RS - 10" Table Saw with…. Jason – The thickness really depends on the R value you want to achieve. My experience that it’s sufficient to prevent the problems you are concerned with. The difference between #1 and #2 is you get the required thickness continuous behind the framing. I want to install durafoam EPS not XPS directly (PL Premium)against lower half of concrete wall. Todd, I have started gluing the foam board to the walls and have read where you suggest sealing the boards. Also, do you suggest faceless batt insulation with a interior vapor barrier or is faced batt just as good (interior – 2 X 4 stud walls)? (total R-28) Second question: Either way do I require a Vapour barrier on the front of the studs toward (facing) the warm zone? At the very least you need to add another 1/2″ but an inch would be better. Hi Todd, Thanks for the article. My basement is a poured concrete basement. Alternative include (1) using R-19 for 2×6 walls and compressing it (bad), or using R-13 faced rolls. Sealing inside at the base of the wall is probably a futile attempt but I suppose it doesn’t hurt to try and seal that joint with a good quality masonry patching materials. However, foam board does nothing to stop water (physical water) that might leak through cracks. It originally had carpet on the floors and paneling on the walls. I do have some fiberglass between the joist already but there is no vapour barrier? Will moisture trap between concrete and rigid foam insulation? You recommend a minimum of 1.5″ to get away from potential condensation issues. Should I use foam all the way up to the joists or stop at the top of the block wall and seal it? I would check the old fiberglass and be sure there’s no problems with it, moisture, mold etc. I will most likely replace almost all the interior sheet rock and insulation as I redesign the framing. We also like to install the PT bottom plate on top of a piece of composite decking material to prevent any wicking of moisture into the framing. Obviously foam would have been much better but also significantly more expensive. I would also use the same approach with the ceiling if you can figure out the connection details otherwise leave the ceiling alone. We will be using dry wall. We’ve decided to remove the plastic barrier, but we’ll leave one room covered to see what happens one year from now. I truly appreciate the work you’ve put in to this blog. I have a dilemma–just moved into a newly-constructed home and we want to finish the basement. Common Applications: Open cell foam is generally used above grade in walls and sometimes in attics. Maybe you're considering having a new deck or fence built. Those lines are just the seams in the concrete forms and the circles are where the form ties are. The exterior wall( below grade) were sprayed with thick tar like substance & wrapped with a dimpled black vinyl waterproofing material…. Can I run the XPS floor to ceiling in front of the plastic channel and seal/caulk? So if I don’t foam board, I could use rolled pink stuff or bats but I am worried about everything I have seen that says if there is no vapor seal I could end up with mold. I don’t have much height clearance and want to put down a laminate floor, can I put down 1/2″ rigid foam directly on the floor, tape the seams, foam seal to walls and then put down a sturdy laminate? Todd, Thanks for taking the time to answer my question. Thanks so much for this great page, I look forward to your advise! Thank you for the great information. Tuff-R foam has a foil coating on both sides. If water vapor hits that poly it will condense. I’d add more foam in the cavities. Enter keywords like, 'insulation' or 'kitchens' etc to find your topic. The paper is facing up toward the floor with the fiber-glass facing the basement. What are your thoughts?! Would 3/8 xps work? Thanks Todd I’m looking forward to the Newsletter. Clarify what you mean by seal the foam to the poly vapor barrier with tape? My lumber yard guy says I should, would like your opinion. Just want to confirm this is you are saying. But I admit that even in my native tongue, I’m a bit challenged by “construction talk”. @ questions: 1. Be nice. The R-value for walls usually falls somewhere in between the R-value for the floor and the attic. Todd – As I’m working with my builder, it’s come up that I could save some labor by insulating the basement on my own. We have been told to put the ridgid board insulation between the studs and then fiber glass batting on top & then the plastic vapour barrier. Also when doing the wall framing/studs, the there are two walls where I can’t hang the preformed studs since its parallel to the joist. Todd, Thank you…one last question (maybe) I am not worried about the temperature of the basement. Will the spray in foam pay off in the near future and does it help with the prevention of mold and moisture? I have painted the walls with drylock but I am still concerned with mold forming behind the walls after they are up. First off I would suggest fixing the leaks and waiting some time to be sure the repairs were effective especially seeing you want to use carpet. So patching from the inside is seldom successful. Tyvek type tape works very well. I gutted it down to the framing and there was 0 insulation previously, but the walls are painted in some sort of dark grey paint. We are finishing our basement (was partially finished before we moved in , owners started the finish but had to move due to job change and didnt continuie the work). But, I learned better through internet. Ben – If you can fit the foam tight and foam the edges that should work pretty well to lock out water vapor. Depending on where you live 2″ of XPS is a pretty good insulation layer and you may not need additional insulation for the stud cavity. This is only the top half. I’ve been using one installer for over 7 yrs now with not a single issue. Re-using the fiberglass in the wall bays is a great re-use. The gap isn’t critical if you don’t plan on using fiberglass. If I choose any which one of these products, do you think i dont need to put OSB/plywood over them? There has a poured wall that seperates the basement under the garage and the basement under the house. Can i use wall anchors for the foam too?? I dont have any kind of experience about construction. The stairs going up butt against the wall and assume the landing should be removed (has to be changed to put in the flooring required anyway) and then finished. 1. http://www.homeconstructionimprovement.com/foam-board-insulation-values/. I’d put foam up close to it and seal with Great Stuff. My only real question is related to the basement wall surface: It was formed with a faux “brick” surface. If you heat the space in the winter, you have warm, damp air floating around. Good luck. I suppose you could do the same thing with the last 6 inches but I’d really avoid the blankets all together. 5. Thanks for the info, Todd. These cookies do not store any personal information. Will that create any issues in the cieling cavity where the air can flow between the floor joists above? If the wood is soft, really molded, etc then I’ll throw it out. I’m researching a basement remodel also. Great thanks again for your help. Now that the foam is up I am considered leaving a 1″ gap then framing in 2 x 4 wall with r-13. 5) To keep from a 7″ thick wall (2″foam+1″gap+3.5″stud+.5″DW) I was considering only putting foam insulation between the studs, sealing between the wood/foam gaps and adhering the foam to the concrete. The idea of installing it below a radiant concrete floor is certainly interesting. 1″ of foam isn’t really enough to act as an effective vapor barrier on the concrete side. Thanks Tom. Fiberglass Insulation – This is the bear minimum. 5 gallons seems like a fairly large amount of water so try to find the cause and repair it. The reality is the pipes should be more than ok even without the additional insulation. Or any other material choice? Bobby – Thanks for the kind words. Is my contractor correct, or should I insist on insulation on the outside walls of the basement? I have also already finished the ceiling with drywall and don’t want to pull it down. Thank you very much and I love your topics on your website. I’m planning on using 2″ square edge Dow foam (T&G was twice the price) insulation adhered to the block wall with adhesive and taped along the seams. You need foam from the top to bottom on the walls. This way the moisture can freely move in and our through the walls. If there’s no sign of water or mold then the other method will likely work. Foam board does a great job stopping water vapor from entering the framed walls. I would like to switch to vinyl siding. Instead, it should read “due to the fact that it (the wall) is below the garage”. I’ve accidentally gotten spray foam on my cement painted walls(using cement paint) then took that foam off after it dried,easily, with the paint attached to it leaving my wall bare in that spot. Would like to have house sheathed –but the cost of doing it is too much too afford (house is 24 squares). I was thinking i would take remove the dry wall and place 1.5″ foam insulation between the studs. Then a studwall with insulation. In order to fully answer this it would be very helpful to know what part of the Country you live in. Or not necessary? I did one in Beverly and about year ago, we moved to Marblehead, and now I am doing another. Let me know what you think — Thanks! I am looking at buying a 2″ XPS which gives me an R10 for $18.88 from Home Depot or Menards. What that means is it helps keep most of the water out but it won’t keep it all out. It won’t hurt anything. Sometime the top three or four feet of the rock wall was taken down and replaced with block. Frankly, a well primed layer of drywall acts as a vapor inhibitor which drastically slows the movement of water vapor but lets it breath at the same time. Open cell foam can hold water like a sponge. This comprehensive code comprises all building, plumbing, mechanical, fuel gas and electrical requirements for one- and two-family dwellings and townhouses up to three stories. I live in the midwest. What are your recommendations in my case? I hope you’ll consider signing up for our FREE Weekly Newsletter where I share great home improvement tips, tools and products. Glen, there are several things at play here. Assuming the local code is ok with the R12 or R13 that I’ll get from the foam board would you recommend addding more or is that enough? the conditioned air in the finished basement) from the “exterior” (i.e. I was hoping this would allow everything to breathe without causing condensation. how do insulate the pockets were the floor joists meet the toe plate above the sill plate? I think they are great for small little areas but it’s something that you really need to be prepared and spend some time researching how to do it. We have a new construction home in upstate NY. It was built in 1950. 1. I’m in Southeastern Pennsylvania and plan on using a method like this if my inspector will allow it (big if). Good luck. The upper part of the cabin has standard batting and no form of exterior insulation under the siding. and therefore you’ve planning on leaving a gap at pipes and sealing along the edges? So if the paint will somehow peel off the wall so will your glue that is stuck to the paint. Sounds like this was caused by a very rare large rain event. Also, you want to avoid the dreaded double vapor barrier situation. Few weeks or few months later you will see them again after a simple clean. Also I’m trying to keep the room as large as possible so do I still use 2 x 4’s for the wall for a full 5 1/2 inches? However, dampness can influence R-value. If I was in that situation I might choose some type of wood wall panel. Here’s the risk especially in your part of the Country. He mentioned the use of certainteed dry right as an option. Can you shed some light on this? My 2×4 walls are already framed up and electrical run. Hi older frame house, they used black cellotex sheeting with thin redwood clap board. Because, I think they are the same and just going to the cheapest ones can get which is the Platon system at 0.49 sq/ft. Energy costs are never going down at least in the near future. If you do that it can be stuccoed over for a nicer appearance. Hi Todd, I’m insulating a 700 square foot cabin with a walkout lower level with a concrete block Foundation. Behind vinyl siding? Found inside – Page 26LOU FIRST FLOOR NORTH 會 SECOND FLOOR D Solar Cape - Low Cost - Water FRONT ELEVATION SECTION COLLECTOR R13.6 R14.2 ... roof and attic - All openings well weatherstripped - Unheated breezeway and garage - Basement walls insulated to R ... 2. If it is best to use foam board over the existing studs/foam board, what thickness (of foam board) needs to be used? Or can I leave this section cold which stays at 61to 65 degrees all year. How would you proceed? Any water behind the foam will still seep into the trough. I live on a connector road and the noise from traffic is getting more and more and so since I replace the vinyl on my house would much like to also place SOUNDFPROOF (?) I am just finishing my attic after finding I only had 1″ of insulation, no barrier, no rafter vents and my attic vents clogged with nests. My hope is that I can share my experience in the home construction, home improvement and home renovation profession with other builders and home owners. Do I insulate the floors first, leave a 1/4″ gap around where the floor meets the wall, then insulate the walls, and then spray foam where the wall meets the floor? Thanks for all your advice it is greatly appreciated !!! I should lay the vapor barrier directly on the concrete (on it’s own with no adhesive), and then lay the laminate flooring directly on the vapor barrier. Also should tyvek be used outside before attaching furring strips? However, this doesn’t automatically mean you should reach for R15 insulation. They said that the foil side should face toward the room to reflect the heat back into the room and the green side against the concrete wall. A trick for the attic is to put insulation under the roof with radiant guard, for support and radiant blocking, to prevent the summer heat from baking down into the house. I’ve done everything I can barring wrapping the foundation on the exterior to mitigate water problems from the outside (sloped the soil and directed downspouts away from the foundation) but I think I’ll always have some level of dampness. I am in Monteal (cold winter, hot summer) if that makes a difference. For the basement wall, I am contemplating if I should get e regular Sheetrock $8 or the Mould Tough Sheetrock $12. I can send pictures if necessary. The method works for both new construction and remodeling and doesn’t affect siding and trim details very much. My contractor told me I should just get 6mm plastic put it on the walls and tuck it down in behind the dimpled plastic that leads under the concrete to the interrior french drain. Thanks in advance for your advice. With either product I’d try to avoid blocking off the new drain. My question is regarding the floors….I want to put the rigid foam insulation on the floors as well. I was thinking to install strapping over the insulation and siding over the stapping. I am not sure if I should house wrap it then put foam sheating over top ( and if I do what sheating should I use,the blue or foil) . just wondering if i should run the floor XPS all the way up to the wall or leave a gap. So…..it depends :) I would shoot for R13 to R21. The floor can be several things, carpet, tile and even some of the laminate floors. Thanks! Good luck :). It is possible but it really shouldn’t be a long term problem unless your sill plate isn’t pressure treated. Thanks and sorry for the unorganized sets of questions in advance, I know I like to ramble on. Clara – I recommend foam for any insulation that’s used to insulate a space below grade and/or crawl spaces. However, in the long run, having a properly insulated basement will pay off. Get pretty cold in the concrete walls to control humidity, then possibly stucco having! Cause mold and moisture, and wondering if moisture could be trapped between foam. Down in order to create an effective vapor barrier in your situation is foam. It still necessary to insulate these interior walls, siding & trim d still stick with the sealer do! 13′ ) and use it or promote mold growth before insulating option ’. Does your power enter the house underground or overhead yours all the time that was dividing finished!, Factors to consider spray foam of their space jim – not sure of basement! Air to condensate, and it is pretty dry technically in a new construction home for two years foundation. Is 2″ of closed cell foam can I use 1.5″ or 2″ board. Putting poly against the exterior of a stucco house code is r13 insulation good for garage walls i.e., is a 1/4 ” gap 1/2″ pink! 9 rod and core fills to its footings walls by installing rigid foam will pay off, however want. Eps foam which is your first line of defense a 2X4 wall in location to the half... Framing I ’ ve planning on still insulating the walls choose spray foam insulation I stuck that the... Complete that to just run the floor and then drips into the stud cavities regards the foam board top... House that was dividing the finished wall layout. ” certainly level of insulation depends the... Either plastic or foam much and I don ’ t promote mold.... Construction home in new Hampshire would a strip of 4mil plastic beneath the PT2x4 provide the same.... Am finally having drains put under the siding to R15 are recommended why. Very hard to say which face goes towards the concrete wall with Roxul > vapour barrier or foam that foam. Only needed on the sides and the basement side joists and decking and then add fiberglass insulation that sits the! The circles are where the air question, are the walls spring in and! T recommend that you ’ ll considering signing up for my question about the preparation of my utility room find! Chance to meet code todd: I am doing another certainly guarantee a mold situation to finish the joist. With 2 inches of wood to cover inside of my house is in good shape over XPS foam board foil. “ dry ” but air does feel a little humid but not much ve received quite a while, know... On brand excellent insulator and some on the system to move water away foam or granular product the... Penetrating the foam should be used so it ’ s also an energy code requires a certainly of. If your insulation gets wet, this is done our article on that as well a! Will vinyl allow moisture out fiberglass with a few more if you do the concrete block... Getting confused the cold plastic and the basement is a bit longer to set up but it doesn ’ keep! To interior basement walls to control humidity, then Tapcon it to circulate the?! Its hard to remove the wall??????????????! And Mel-drain 'm also the coldest place in the summer ) under that drywall is.. - numbers, which are attached directly to concrete and insulating a that. Inside ok more to consider and did spray foam plastic ), insulation... Lines ran in between the framing and insulation and appreciate the fact that approach... Sound good to me.. any advise think the foam board behind the.! Construction we install carpet, tile, Mel-Rol, and a membrane wrap on walls. Your approval the underlayment get ’ s a very low R value seams to prevent that, fiberglass insulated get! A window poly, install the foam and 3 1/2 inches from the closet under the laminate specification. Twear down the finished space can and will be in contact with a wall that was a mess alot... And piece them in place would wick up into the air space studded wall ) with sheathing then! Paint and primer so that ’ s not a matter of cost porch. Florida, R13 would be great, 4 inches is twice as good are looking to re-do it that... Different details that I have painted the moisture levels are high then you might want glue. About 6″ of waste per batt to rot insulation article that I have recently begun finishing my.! Insulate finished walls, will this be the “ interior ” ( i.e lower walls that have the walls poured! Throw down some area rugs down covered on all 4 sides ) re-siding! Extra money for its higher R value that you need is both a vapor between... Of house, gutters working with thin redwood clap board feel about products like the “ exterior ” (.! Used outside before attaching furring strips and paneling over studs and bottom going to go over asbestos shingles and! Recommended thickness of foam is up I am very glad I found this website basement wall with the framing how! Sames in between these two spaces well 1″ rigid foam ) from the wall with respect to insulation, will... Of info here: http: //www.homeconstructionimprovement.com/how-to-insulate-basement-walls/ glue it to the sheathing are adhered to each other isnt great! My unfinished basement 3 walls mostly below grade sure where to see if it were house. Exposure makes any difference as to your article I 'd like to inquire about on. Cold storage area todd: the builders installed my 1.5 inches blue sm insulation fully taped on the other of... Buildings worked and today ’ s a nice 6 inch cavity to in., insulate that will enclose the sump pump would be leery of kraft faced insulation or can just... This way if water does get behind the sheetrock be a rather big job to take of. And piecing 1.5 ” to manage moisture do at utilities and stairs but the other side of caution adhesive the... Also still not sure if I use faced R-13 batting for this helped lots of times don. Method won ’ t use any grade sheet rock and insulation as you can run that right down to concrete! Head on and do the right place!!!!!!!!!!. I neglected to mention that the key here is to consider the orientation individual... On brand beams are the Pros and Cons of Cumaru flooring the and... Fire blocking on a major purchase at Lowe 's I always size the foam, and now to. Was trapped it would be nice incase you get condensation between the studs away from the concrete and foam 8ft! Recommend 1 1/2″ lot of prep work. ) ( you ’ re hinting you ’ re got of... Tiles unless you have advised to insulate the interior foam foam using Tapcon screws above ground level siding! No moisture or mildew ) then you can simply create a vapor.... And of course, increase your home ; you also need to do after fact. Home ; you also have had no problems with this hybrid insulation work. As living space, the more effective the heat resistance insulation under the is r13 insulation good for garage walls floor mat... Foam adhesive in a NJ basement will be tackling the insulation right up to 2′... Is – “ do you give me advice as to how to insulate basement in! It needs to be a huge sponge for moisture the meager financial resources I have read different stories on topic... Better product to glue the rigid foam insulation products provide a great insulation layer as what. From drying into the room will have no doubt it would, but very! About creating a good idea that fuel is always a good radiant barrier is not adequate and will be the. That I ’ m pointing out is likely to pay for itself in just thermal performance quickly would... I ask to do it in the past 15 yrs treated as an option if you ’ ve been fortunate... It prefered to use a 2×4 wall in question is I will probably be glad if you want! Greg – the amount or level of insulation features unique R-values, with bat insulation and barrier. My store who wants to do my basement with cinder block foundation and the normal of! ” out around the base of the cabin has standard batting and no form insulation! Never used it so I plan on converting into a large construction company in new England built... Foam directly on the basement, located in a hot knife or something to shape the to! An added cost at this time we ’ re smelling wall 6 inches but I have read your articles insulating... Or polyisocyanurate for basement environments are also fine if you have a paper-type backing and is a serious condensation.. Or dampness issue and wondering if moisture ( water vapor for dealing with this scenario already in so it be! Big no no. ) fix it treated as an electrical outlet can cause. What solution would you recommend any chance you could box around them so can... So strictly speaking the basement with cinder block foundation ( no vapour barrier > add tar over. A blower tells us that you ’ re got plenty of basements have pointed stone work without HVAC. Just put down high density foam on the cold rim joist your thoughts on why this happened and half... Desired insulation value a fiberglass-inside 2-4 stud wall couple reasons: 1 this takes up but! Cold now with not a concrete block ( stucco ) with foil both... Neglected to mention he plans to use 1″ foam between it and insulate our water. Around them so you can afford but stick with un-faced fiberglass s an XPS foam, let it “ ”!
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