Vaulted Roof Insulation Detail

Insulating a vaulted ceiling is similar to insulating exterior walls with.

Vaulted roof insulation detail.

As it expands the foam seeks out the gaps cracks and crevices and fills them in. Flat roof cathedral ceiling we re going to give it a try. There are several options for installing insulation in a vaulted ceiling. Below is 1x decking and 2x4 rafters.

Cut and insert 1 or thicker high r foam insulation sheets r 8 per inch against the furring giving a 1 or greater air path between the insulation and the roof deck under the cathedral ceiling. Among the easiest options is to install rigid insulation sheets over the rafters which not only provides insulation but also the structural function of enclosing the roof. After it sets spray foam insulation forms a rigid durable barrier to prevent the warm air that s inside your living area from exiting through the vaulted ceiling where it no longer has chance to create damp or mould. Nail 1 furring along every rafter side against the roof deck.

Existing is a fourteen year old roof with 2 of closed cell roofing foam with an acrylic elastomeric coating. The insulation is not affected by water. Our plan is to put rigid board up between the 2x4 s caulk the edges and then hang sheetrock.