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?