Roof Decking With Insulation

There are at least two good reasons why this approach makes more sense than installing the insulation under the roof sheathing.

Roof decking with insulation.

And vented or unvented attics that are insulated above the roof deck with rigid foam. 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. It typically has 3 variations. The later is used in new construction as the interior board serves as an inner wall.

High efficiency attic insulation helps provide added thermal protection lessens wasted energy and increases enhanced comfort and quiet. The dew point is typically within the insulation layer lowering condensation risks. In this case the rigid foam can be thinner than when it s used alone. Venting the roof is essential for preventing damage to the roof decking and shingles from hot air that can build up beneath an unvented roof.

Rigid foam on roof sheathing with air permeable insulation between the rafters. For standard steel deck construction this approach has many advantages such as. The solution is not to ignore the insulation but to add one component. Insulated decking for flat roofs comprising a fibre free polyisocyanurate pir insulation core faced with tough exterior grade plywood used as pre insulated foil backed thermal insulating decking for flat roofs.

The movement of air into indirect conditioning of an unvented attic is a slow gradual process that will not be noticeable by occupants and typically will not put any strain on the hvac system. It is ready to fix and finish using basic tools and traditional roofing techniques. Code specifies the minimum r value of the rigid foam layer. Rigid foam also can be installed above the roof sheathing in tandem with air permeable insulation between the rafters.

If there is a leak the air flow ventilation will help dry out the moisture. Ecotherm eco deck insulated decking board combining a fibre free pir insulation core and osb or plywood facings ecotherm designed eco deck insulated decking boards as a tough thermal roof decking for flat roofs. A gap of at least 1 2 inch is necessary at the back of. For most of us in the low slope roofing industry it s considered to be absolutely standard to have insulation placed above the roof deck.

But spray foam insulation used at the underside of the roof deck would need to be covered by a thermal barrier and intumescent coatings are commonly used. T his ventilation offers another benefit. Rigid foam board is just above the roof deck or an exterior insulation option. Insulated roof assemblies can be vented or unvented.

By leaving an air space between the insulation and the sheathing we can have air flow over the framing.