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Only spray polyurethane foam can be used for this application as batt insulation will end up sagging and blown insulation simply can t adhere to the roof decking.
Spray foam insulation on roof decking. Spray foam is a material that is essentially manufactured when applied at the building site. The movement of air into indirect conditioning of an unvented attic is a slow gradual process that will not be noticeable by occupants and typically will not put any strain on the hvac system. It rots roofs people have told me. This is a great question.
This illustration shows a sloped roof with cavity spray foam insulation sprayed on the underside of the roof deck and covered with sprayed on thermal or ignition barrier coating. The insulation extends down the roofline to the rim joists and soffit areas as well as on gable wall ends. The code allows for insulation directly to the underside of the structural roof sheathing providing the unvented attic is contained completely within the. Radiant barrier sheathing is inexpensive and reflects thermal radiation to keep attic spaces cool.
This should not be a concern when applying foam to the underside of a roof deck. Gaco is a best in class provider of silicone roof coating systems waterproofing and insulation solutions for commercial and residential buildings. A number of factors should be taken into consideration when choosing between these two especially the climate zone that you re building in. I have not heard of any evidence to support your theory.
Both open cell and closed cell spray foam insulation adhears extremely well to the underside of roof decks and the rafters surrounding them when installed correctly. Take measurements before the installation of the air impermeable insulation to help ensure that the roof deck is dry enough to be covered with spray foam insulation. Moving the air control layer and thermal control layer to the underside of the roof deck has significant advantages in cases where the hvac system is located in the attic. Murmurs and hearsay about open cell spray foam insulation have been gaining traction for a while.
When installing attic insulation a case can be made for both radiant barrier sheathing with typical types of insulation as well as spray foam insulation.
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