The spray foam can also serve as the thermal and vapor control layers in both new and retrofit construction.
Spray insulation roof deck.
Air permeable insulation applied to the underside of the roof deck with minimum r 10 rigid insulation above the roof deck.
When the choice is made to insulate along the underside of the roof deck spray foams have advantages over other insulation types because of the ability of spray foams to effectively air seal complex assemblies.
Yeah you probably still breathed some of it but not as much as you will now with spray foam on the roof deck.
Air permeable insulation applied to the under side of minimum r 10 air impermeable insula tion spray foam or rigid board which is applied directly to the underside of the roof deck.
Your indoor air quality may get worse.
Install insulating sheathing above the roof deck on existing homes.
The installation steps are as follows.
All spray foam insulation radiant barrier and other components of the roof deck must be installed in accordance with manufacturer s installation instructions.
Spray foam insulation applied on the underside of the roof deck in cold climate commercial buildings allows for a significant reduction in condensation potential particularly compared to interior air permeable batt systems.
Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls.
Inspect the existing roof shingles or roofing membrane for any deficiencies.
Lstiburek takes blame for bad language.
Insulate an attic in an existing home by installing spray foam open cell or closed cell on the underside of the roof deck.
You may have odor problems.
By encapsulating the attic and leaving the old insulation up there that filth is in your conditioned space.
The last requirement is the installation of your shingles must be performed in strict accordance with the owens corning installation instructions.
The later is used in new construction as the interior board serves as an inner wall.
Rigid foam board is just above the roof deck or an exterior insulation option.
This measure will convert a vented attic to a nonvented attic.
This retrofit assembly is appropriate for homes with conditioned attics or where the retrofit is intended to create a conditioned attic.
It s not coming from above the roof and it s not some new moisture source resulting from the spray foam.
Remove existing roofing and non adhered underlayment to expose roof sheathing.
This construction approach was first used in the 1970s and it has been implemented much more widely since it was first included in the international code council s icc model building code in 2007 irc section 806 4.
Moisture generated indoors or that infiltrates into the home is responsible for the bulk of the moisture in an attic insulated with spray foam on the underside of the roof sheathing.