Description
Johns Manville (JM) DuraFoam is a high-thermal rigid roof insulation
board composed of a closed cell polyisocyanurate foam core bonded
in the foaming process to DuraBoard™, an expanded perlite mineral
aggregate board.
The top surface of DuraFoam is sealed with a special polymerized
asphalt emulsion coating to allow for the direct application of
SBS or APP membranes utilizing heat-weld application techniques.
Use
DuraFoam is designed primarily for use as a roof insulation board in
new and recover applications over metal, nailable and non-nailable roof
decks in SBS and APP heat-weld applied membrane systems. It can
also be applied in BUR, modified bitumen and certain single ply roofing
systems using hot asphalt, cold adhesive, or mechanical fasteners.
JM supports NRCA Bulletin #9 in recommending that a cover board
of Fesco® Board or ½" (1.27 cm) Retro-Fit® Board be installed over
foam insulations in hot membrane systems.
