fact or myth: leave an air gap between insulation and...
网页2012年2月23日 · 87 posts · Joined 2011. #1 · Feb 23, 2012. A lot of people have been telling me that when installing insulation it is necessary to leave a bit of an air gap between your outer wall and your insulation in order to allow for air flow. How much of a gap has never really been specified, which is also confusing because I understood that bat ...
House wrap over insulating foam board or under?? - DIY Home …
网页2008年7月31日 · 3/8" foam board is useless as insulation. Minimum 1.5" foam is recommended for thermal break, in addition to required r13 in walls. If 3/8 is spacer only for windows and such, though expensive spacer. Then option 2. OSB is already large covers, so osb helps a lot with air sealing.
Can foil faced foamboard insulation be layered?
网页2009年10月10日 · It features a high-performance polyisocyanurate foam core with radiant barrier-quality aluminum foil facers on both sides (one side reinforced). 1. Avoid damage to the insulation due to moisture (some types of insulation, like cellulose, are …
concrete block wall insulation: attach furring + foam board to …
网页2022年12月9日 · Foam board joints are sealed with tape, gaps with canned foam. Furring can be either wood or steel channel. Foam board will be 3/4" thick foil faced R-5 polyisocyanurate. Depending on what's in the wall, furring will be either 1x2 or 2x4 laid flat. In addition, a couple of areas will have a fully framed 2x4 wall attached to the slab and …
Adding foam board insulation & plywood to underside of roof
网页2011年5月4日 · The plywood may block some venting- collecting condensation to grow mold, may not, hard to see without doing a smoke test. It seems to me the air would be forced against the roof rake, not picking up as much of the inside attic air, acting as a giant baffle. If you have a leaky (air) attic, air seal it first as this is more important than ...
Drywall over 1-1.5" rigid foam? - DIY Home Improvement Forum
网页2009年1月4日 · 2. For the stairway walls and ceiling, I ripped 3/8" ply into 2" strips and went over 1" and 1.5" foam. I kept the strips right over the studs/rafters because -- strips were flimsy (they needed support and wouldn't alone hold drywall); and, to keep my head clear on where romex traveled behind the foam.
Foam board insulation instead of fiberglass batts for stud bays?
网页2019年10月11日 · Plus 2" foam board in a 3-1/2" depth stud bay leaves 1-1/2" of air between the foam and the interior drywall, which helps boost overall R value a little bit (not sure how to quantify the R-value of the air space). Going with foam board is more expensive ($1.24/sqft vs $0.53/sqft) plus the cost of spray foam cans, but it's only one room, so not ...
Rigid Foam on floor - ok to walk on? - DIY Home Improvement …
网页2013年5月19日 · Ok, I see your point. I am not going to say my idea is the only right one, many ways to do the same thing. I would lay 2"x4" on the flat at 24" openings between the 2x4, use 1.5" rigid foam inbetween, and then 3/4" plywood subfloor on top. Then install any type of flooring I desired. Laying the foam down and then 2 layers of 1/2" plywood on top ...
Rigid Foam Insulation over existing wood siding
网页2010年3月5日 · 1. take out the existing wood sidings, and inspect/repair the sheathings. 2. build out the window openings with 2x4, this will give me a solid nailing base for the windows, 3. then install 1.5" rigid foam insulation, and bring the foam up to the new 2x4 nailers built in step2. 4. tape the edges/seams of the foam.
Doubling up of XPS foam panels | DIY Home Improvement Forum
网页2015年10月25日 · Caulk the wood joints first, before adding foam w. foam from can to air-seal from infiltration. For Zone 5 (Chicago) R-5/13 cavity FG gives safety to 36% Relative Humidity, R-7.5/13 gives 39% RH, R-10/13 is 44% RH …