ScottnSherrie wrote:
Agree with DaHose above. Mine seemed like it was all glued as one big piece then laid in top. There was the occasional 2x3 cross piece, usually adjacent to any opening such as vent, AC opening or skylight. Other than that there were some other 2x2 pieces strategically placed to hold up the cabinets.
If the area that need patched is not lined up with an opening, it could be only foam insulation under the luan in that area.
If that's a case I wonder what would keep a person from cutting out the luan with a circular saw set for a very shallow cut, then patching back in with just some foam-safe construction adhesive, then an EPDM patch, then an overall roll-on coating.