Lois B
11/3/2005
For other clients, my builder has been spraying Icynene insul. foam without providing any space for ventilation between the metal roof and the foam, which I believe is incorrect practice and will damage the roofing material (and possibly void the warranty). What is the proper application of a spray product on a single-story residence with a minimally sloping metal roof (1:12)? The roof vendor web site doesn't address this topic. Thanks.
Lois B
11/3/2005
I need to add some info, sorry. This is in Arizona (hot, dry climate) and in parts of the house that have no basement, the major systems are run through the ceilings.
Allan Reid
Dura-Loc Roofing Systems, Inc.
11/4/2005
The building code breaks the rtoof slope at 2:12 with anything over steep slope and reqyuiring ventilation. Under 2:12 it is low slope and they do allow non vented assemblies. Certainly though you should check with the manufacturer and ask for their product approval report which will indicate if this type of application has been tested and approved.
Allan Reid
Dura-Loc Roofing Systems, Inc.
11/4/2005
As to the climate, the sprayed in place acts as an air and moisture barrier. One needs to determine the upper temperature limit of the foam as it could break down with the heat and the off gasses could be trapped. From a insulation point of view, recent tests at USDE in Oakridge have shown 30% heat transfer reductions by vaving a ventilated air space however extra insulation would compensate.
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