Which way should the foil facing on polyiso rigid foam face?
网页2017年12月16日 — I was thinking of not sealing the perimeter prior to installing the rigid foam to give any moisture entering the cavity an avenue to escape. Although no moisture should really be entering the cavity from the inside and to the best of my knowledge, polyiso is vapor-impermeable (not sure about the 1 part foam but I think it is vapor-permeable).
Foil faced insulation on basement walls? - GreenBuildingAdvisor
网页2022年8月22日 — I’m in climate zone 7. A previous owner had insulated the concrete basement walls with 1.5″ of foam with thin wood paneling attached directly on top. In some areas there was fiberglass insulation in a 3.5″ cavity directly against the concrete. Totally inadequate and not up to code. The basement is relatively dry and it rarely gets very ...
Using Rigid Foam As a Water-Resistive Barrier
网页2010年9月3日 — There’s no simple answer to the question. It is possible to use foam sheathing as a water-resistive barrier (WRB). However, those who choose this route should know: Some brands of foam have been approved for use as a WRB, while others have not. Even if you choose a code-approved foam, you can run afoul of your local building inspector if …
Should I use two layers of 1 inch or one layer of 2 inch rigid foam ...
网页2012年11月20日 — Locally we have available foil-faced on both sides. My understanding is to have only the exterior side foil faced. If using two layers of 1 inch, then should the board against the stud be unfaced? I've read the articles on rigid board insulation on the exterior and concerns of condensation. I live in a warmer part of zone 5B at 3,400 ft. elevation.
Rigid Foam Insulation - GreenBuildingAdvisor
网页2010年2月1日 — Building scientists Joseph Lstiburek and Peter Baker have reported that adding 1 in. of R-5 insulation to a 2×6 wall insulated with fiberglass batts increases the effective R-value of the wall from 14.4 to 19.4—a 35% gain with only a 15% increase in wall thickness. Adding 2 in. of foam raises the R-value from …
Foil-faced rigid insulation under floor joists
网页2019年1月22日 — After reading Building Science Corporation document BSI-009: “New Light in Crawlspaces”, I have a couple of questions about using foil faced rigid insulation (isocyanurate) attached to the bottom of floor joists. My question assumes a vented crawlspace, 12in floor joists, R30 Rockwool batt floor cavity insulation with …
Walls With Interior Rigid Foam - GreenBuildingAdvisor
网页2015年3月27日 — In the 1980s, most cold-climate builders were taught that walls needed an interior vapor retarder, and needed to be able to dry to the exterior. When a few pioneers started installing exterior rigid foam, some people thought the practice was risky. “Rigid foam is a vapor retarder, so it belongs on the interior,” some old-time builders opined.
Rigid foam, vapor barriers, and moisture issue avoidance
网页2017年1月10日 — 1. Under your slab, you want a continuous horizontal layer of rigid foam. Above the rigid foam, you want a layer of polyethylene. Then concrete. 2. On your stem wall, the rigid insulation can either go on the interior side of the concrete wall, or on the exterior side of the concrete wall. The information in this article applies to crawl spaces ...
Combining Exterior Rigid Foam With Fluffy Insulation
网页2016年2月26日 — Image Credit: Fine Homebuilding. It’s becoming increasingly common for builders to install one or more layers of rigid foam on the exterior side of wall sheathing and roof sheathing. Typically, these walls and roofs also include some type of air-permeable insulation (fiberglass, cellulose, or mineral wool) between the studs or rafters.
Attaching Foil-Faced Polyiso to the Inside of a Finished Wall
网页2014年11月17日 — One way to improve the situation is to install horizontal or vertical furring strips, 16 inches o.c., between the rigid foam and the drywall. If the rigid foam is foil-faced, this air space will have an R-value of R-2 or R-3. The furring strips are not necessary, however. I have installed drywall over 2-inch rigid foam without furring strips.