| 4.1001.6a
Surface preparation | Underside of roof deck will be prepared by sealing penetrations Roof deck will be free of contaminants to ensure adhesion of foam | Ensure proper bonding of
SPF
SPF
Spray polyurethane foam
to substrate surfaces |
| 4.1001.6b
Installation of insulation dams | Dams will be fastened to underside of roof deck and outside edge of exterior wall top plate to prevent
SPF
SPF
Spray polyurethane foam
insulation from entering soffit area Installation will allow for the highest possible R-value above the top plate of the exterior wall | Ensure insulation R-value is not reduced Minimize waste of
SPF
SPF
Spray polyurethane foam
Ensure continuous insulation and air seal of exterior wall top plate and roof deck |
| 4.1001.6c
Elimination of attic venting | All gable vents, ridge vents, and roof vents will be covered with suitable backstop material to provide substrate for
SPF
SPF
Spray polyurethane foam
application | Remove ventilation points when converting from vented to unvented attic |
| 4.1001.6d
Removal of existing insulation and
vapor retarder
Vapor retarder
A material that slows the passage of water vapor and contains a perm rating above 1
| All existing attic floor insulation and
vapor retarder
Vapor retarder
A material that slows the passage of water vapor and contains a perm rating above 1
will be removed | Ensure the new conditioned space is coupled with the house |
