This makes perfect sense, but isn’t strictly necessary. October 4, 2016. I ended putting up 1/2" drywall directly over foam (blue XPS) in 2 ways: 1. It appears that the vapor barrier is on the drywall side. Now as far as your plan to use XPS - high density foam - on top of the studs before the drywall … Rigid foam insulation works like a blanket on your home. The typical challenge installing drywall over rigid foam is the length of screws needed to secure everything to underlying solid wood in the house frame. Wgoodrich. Adding a 2x4 stud wall is actually the easiest as it provides the extra space if more insulation is needed and room for all wires. Uncategorized; Leave a comment. Visit our subscription preferences page to subscribe to Industry News or manage your email subscriptions. Since most fire codes call for a minimum of half-hour fire rating over foam insulations, paneling would probably not provide a sufficient fire barrier over the foam insulating board. 2-1/2" or so should do you with one inch foam board. Under this section, "foam plastic is not required to comply with the requirements of Sections 2603.4 through 2603.7 when specifically approved based on tests such as FM 4880, UL 1040 or UL 1715 listed in Chapter 35. Install these panels over wall or ceiling cavities, including those filled with existing fiberglass batts, to boost the R-value and improve home comfort and efficiency. This is something that has taken me almost two and a half years to complete. For example, the framers would attach wider nailers in the corners, and we had to mark joist and stud locations on the foil facing before hanging the boards. The problem with that application has always been that the foam board needed to be covered with a “thermal barrier” or “flame spread barrier” like drywall in order to meet local fire codes. The drywall you are planning should be sufficient as long as all is covered. But … We also found that the nails used to tack the foam in place had to be set below the surface of the foam, or they might burst through the drywall’s paper facing when we screwed the drywall down tight. The dry wall guys said not to put anything on the 2 X 4 surfaces , they wanted to place the dry wall … 1-5/8" is standard for ceilings. Save time and space in your basement with Owens Corning FOAMULAR® INSULPINK® extruded polystyrene (XPS) insulation. SBC Magazine is publishing this story to raise awareness of information publicly available online and does not verify the accuracy of the author’s claims. In those days, most of the homes I worked on had a sprayed popcorn-texture ceiling, so fastener problems weren’t always obvious. The screws themselves remained tight, but we still had to fix the problem by recoating with joint compound, sanding, and repainting. New 1/2-inch drywall is usually called for [and in some installations, fire-rated drywall or thicker drywall may be required for local codes and for certain applications]. It can be installed on the exterior of the foundation walls, but in order to be effective, needs to be installed to the full height of the wall which means protecting the above grade portion. Copyright © 2020 Hanley Wood Media, Inc. Reply ↓ J September 27, 2016 at 1:01 pm. Treat the foam rather than the drywall as the air barrier, sealing all edges, seams, and penetrations. And I wouldn’t use foam thicker than one inch. The following article was produced and published by the source linked to above, who is solely responsible for its content. If you do install strapping over the foam, keep in mind that while the air space created by the furring will add to the assembly’s R-value, it also can create air pathways into the walls or ceiling. I plan on using the appropriate length screws for the drywall, to compensate for whatever foam board i go with. As I look to insulate my basement, I have several reasons why I'd prefer plywood to drywall as a covering. When my house was built I put in the wall insulation; I put the paper-facing of the fiberglass batts ( flanges) on the 2 X 4 wall studs. With the time and space saved, it’s worth its weight in…well, rigid foam. A few weeks ago, the heat of summer broke and I got up off my duff to begin working on the house once again. I … Learn more and access 2016-2017 archives here. For example, the framers would attach wider nailers in the corners, and we had to mark joist and stud locations on the foil … We had to do several things differently to make that approach work. If it’s internal then there are a number of different possibilities. Best practice for basement wall insulation [best insulating and vapor barrier system] is closed-cell foam, the second-best is using foam board, especially if you’re trying to save money. The 15 minute thermal barrier can be achieved by covering with 1-1/2″ mineral fiber or ½” drywall glued to the foam board. If the rigid foam … On some smooth-finished ceilings, we’d occasionally see slight dimples around some of the screws, which I believe was caused by the foam expanding slightly as the attic heated up (the same thing never happened on walls). Q: Is it okay to install drywall directly over rigid foam? I’d also use extruded polystyrene instead of polyiso, because it seems denser and less likely to dimple. Originally published by: Journal of Light Construction — October 12, 2012. Assuming the foam was properly fastened, this would require fewer drywall screws and might minimize the possibility of dimpling. 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