Insulation On Roof Sheathing

Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency.

Insulation on roof sheathing.

Open or closed cell spray foam is applied to the underside of the roof sheathing and additional fiberglass or cellulose insulation is blown in as a cost saving method for meeting high insulation requirements and filling in the cavity space between the rafters to the ceiling deck. R panel is manufactured with a closed cell polyisocyanurate foam core bonded to fiberglass reinforced facers and designed for use over metal nailable and non nailable roof decks with a variety of membrane systems. Create a surface on which other materials can be placed to increase the stability of the home while providing increased insulation. Use a moisture meter to verify wood moisture content.

Zip system r sheathing is the simple all in one structural panel with built in exterior insulation. 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. While exterior sheathing is made from several types of materials the basic function remains the same. There are two main.

Thermax sheathing is a non structural rigid board insulation consisting of a glass fiber infused polyisocyanurate foam core laminated between 1 0 mil smooth reflective aluminum facers on both sides. Look for water stains on the roof sheathing or damp or moldy spots on attic joists and existing insulation as a clue to where leaks might be. Insulation with the baffles is easier to install. Box out light fixtures.

Featuring integrated moisture air and thermal protection zip system r sheathing completely reimagines traditional wall assemblies by streamlining exterior water air and thermal management. The old insulation could be removed. Any roof sheathing or framing that was exposed to water during construction must be allowed to dry thoroughly before installation of insulation e g. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow.

Baffles can be installed and the foam can be sprayed in. Water is insulation s enemy. It refers to boards or panels that line the walls floor and roof. To a moisture content of 12.

The exterior water management must be fully implemented and verified before roof cavity insulation is installed. In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood. I think the best time to have the job done right is when you are putting on a new roof this includes the sheathing. There are at least two good reasons why this approach makes more sense than installing the insulation under the roof sheathing.

Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. Insulated roof assemblies can be vented or unvented.