Which way should the foil facing on polyiso rigid foam face?
2017年12月16日 · As Dana explained, the foil facing on rigid foam has the effect of raising the R-value of an adjacent air space if there is an adjacent air space. It doesn't matter which side of the air space (or the foam board) is the "hot" side for this to work. R-value is R-value -- …
Video: How to Install Rigid Foam Insulation Outside a House
2010年1月6日 · 1. Use bug screens and flashing below the foam. Many builders protect foam sheathing from insects by wrapping the bottom edge with strips of window screen. We take a belt-and-suspenders approach to air-sealing by backing up the screen with a sheet-metal drip edge.
Can I add foam insulation to the inside of a wall instead of exterior ...
Chris, If you strap over the foam, then electrical boxes can be moved out to the strapping. The strapping, holding the foam board tight to the studs, allows blowing dense-pack cellulose through holes cut in the foam which are then sealed with the cutout plugs and canned foam or foil tape if the foam is foil-faced.
Tips for Cutting Rigid Foam Insulation - GreenBuildingAdvisor
2015年7月6日 · The foam for the roof valley was cut with a bevel for a tight fit and as a bonus this also resulted in offset seams (however, I did have to first handcut the full sheet using a fine tooth saw). I designed the corners of the house to use 2x4's that float on a channel in the foam and screw through to the inner frame and so the foam corner had to ...
Rigid Foam Insulation - GreenBuildingAdvisor
2010年2月1日 · Key differences are R-value per inch, water resistance, compressive strength, permeability to water vapor, facings, and of course, cost. All foam insulation products are petroleum-derived. Rigid foam sheets are sold in several thicknesses; most lumberyards carry insulation ranging from 1/2 in. to 2 in. thick.
Rigid foam attached to underside of rafters: Good idea?
2012年9月19日 · At 600 board feet you can get the spray foam cost down to about $1.20/board-foot, compared to $3.35/bf-ft in the 12 b.f. FrothPaks, or $5+ for 1-part foam cans. Spraying o.c. foam on the underside of the roof deck would provide a more reliable air seal, but has long term issues related to roof rot since the unvented roof deck would get a lot of ...
Spray Foam insulation and foam board - GreenBuildingAdvisor
2021年11月7日 · For walls, provided your rigid sheet is thick enough for condensation control in your climate, you can use either closed cell or open cell foam afterwards. Unless you need an air gap between the insulation and sheathing, the simplest is skip the rigid foam and fill the whole cavity with open cell foam.
Installing Rigid Foam Above a Concrete Slab
2019年1月11日 · I used spray foam to fill gaps between the floor foam and the concrete wall. My first layer of 7/16" OSB butts to the vent material. My first layer of wall foam (2-in. EPS Type 1 - 1 lb/ft³ so maybe I have Type 2?) sets on the 1/2-in. vent material. The second layer of wall foam sets on the first layer of 7 /16" OSB.
Rigid foam over existing drywall? - GreenBuildingAdvisor
2017年7月28日 · I'm planning on converting half my garage to living space, and I would like to add three inches of rigid foam insulation and another layer of drywall over the existing drywall. The walls are 2x4 on 16" centers with fiberglass batt insulation, plywood sheathing (or possibly OSB), house wrap, and vinyl cladding.
Fastening Rigid Foam: Glue vs. Fasteners - GreenBuildingAdvisor
2017年10月31日 · We used a foam gun and the appropriate glue (some glues dissolve the foam). You wouldn't be able to use cap nails in cement, and I would think that tap con or other screws is considerable overkill and a lot of extra trouble. We waited a short time for glue to be starting to dry, making it tacky enough to hold the foam sheet up without much effort.