Converting Vented Attic To Unvented

Converting an attic from vented to unvented can reduce utility costs while improving comfort indoor air quality and durability.

Converting vented attic to unvented.

Watch this if you ve not seen it. Convert a vented attic to an unvented attic and insulate using one of the methods described in the description tab or similar. If the insulation is only placed on the bottom of the roof deck between the rafters it must be air impermeable. From my research it looks like the best option is to make the attic a conditioned nonvented space.

Currently the attic is vented and has zero insulation anywhere. I ve been researching several methods to insulate my attic. I ve been warned that closed cell foam can lead to sheathing rot from either roof leak or vapors from the house. Should i use open cell or closed cell foam to insulate.

If installing insulation above the decking remove existing roof tiles or shingles and replace weather resistant barrier if needed. I m converting my attic into a non vented conditioned space. 5 dumb ways to build in the south. I m unsure of what to do and i m unsure of the most.

Unvented attics are not allowed by the building code yet in canada but are allowed in the international residential code in the us in section r806 which describes three different insulation strategies for unvented roofs. An alternate to spray foam insulation in an unvented attic is plenum trusses which allow you create a reverse bulkhead above the ceiling plane that is insulated. I m considering converting my vented attic into a non vented conditioned space. Asked by gary lichtenstein.

I live in maryland and own a house that has the hvac system in the attic. Close and seal all attic vents including roof deck and soffit vents. By using an air impermeable insulation like spray foam on the roof deck will stop any air movement.