Which side up on installation of Fesco Foam Insulation?
Home Improvement Asked by Bill Horvath on October 28, 2020
I’ve got a stack of Manville Fesco Foam insulation boards salvaged from a commercial installation that I’m repurposing for the inside of my garage roof. I’m planning on machining them to fit around the joists in order to preserve some headroom without sacrificing too much performance in terms of LTTR.
Since I didn’t salvage them myself, I didn’t see how they were installed. So the questions are:
- Which side faces the interior of the building – The black side or the perlite?
- Can I use screws or nails with washers to attach them to the joists, or would that sacrifice too much performance? I.e., should I use something like construction adhesive?
One Answer
The J-M Fesco data sheet shows the black TopLoc layer on top, with a glass reinforced facer on the opposite side.
The data sheet I saw didn't give many installation details, but I doubt a few fasteners with large washers would have a large impact on your thermal performance as long as they only cover a small percentage of the total surface area. Focus more on getting tight connections between the sheets and eliminating air leaks.
Answered by Eric Simpson on October 28, 2020
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