Exterior Roof Insulation Details

I like the existing cedar and don t want to cover it up.

Exterior roof insulation details.

Not only do we withstand hail damage but our roof boards maintain their bond to the roof membrane lowering the likelihood of a catastrophic roof failure. The roof consist of sheathing and shingles on the exterior and the cedar planks on the interior. There are lots of different ways to insulate this type of roof but one of the best methods calls for the installation of rigid foam insulation above the roof sheathing. Insulated roof assemblies can be vented or unvented.

The screws must be long enough to penetrate an adequate depth into the roof framing. There are at least two good reasons why this approach makes more sense than installing the insulation under the roof sheathing. It makes a lot of sense if the rafter cavities are already insulated and it is most affordable when the roof needs replacement. An unvented roof cladding substrate e g.

Exceptional dimensional stability and rated for extreme hail rockwool stone wool insulation roof boards have meet both the fm severe hail and the ul 2218a standard for impact resistance. Plywood or osb roof sheathing can be installed over exterior insulation layers using long exterior grade screws.