Existing is a fourteen year old roof with 2 of closed cell roofing foam with an acrylic elastomeric coating.
Vaulted roof insulation detail.
In the knee wall area the insulation is in the floor and on the back of the knee wall.
Insulating a vaulted ceiling is similar to insulating exterior walls with.
As it expands the foam seeks out the gaps cracks and crevices and fills them in.
Below is 1x decking and 2x4 rafters.
Flat roof cathedral ceiling we re going to give it a try.
The insulation is not affected by water.
There are several options for installing insulation in a vaulted 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.
Nail 1 furring along every rafter side against the roof deck.
Our plan is to put rigid board up between the 2x4 s caulk the edges and then hang sheetrock.
Fiberglass insulation comes in lightweight batts and rolls precut to widths that match standard stud and rafter spacing.