Insulation Over Roof Sheathing

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Insulation over roof sheathing.

Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof. Install rigid insulation board in multiple layers with joints offset vertically and. If the sheathing is boards it s a good place for a self adhered membrane. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away.

The plywood was fastened through the rigid. Expanded polystyrene eps extruded polystyrene xps and polyisocyanurate polyiso. Xps insulation foamular insulating sheathing is xps insulation is used as sheathing over all exterior walls in wood or metal framing construction to create an effective insulating envelope over the entire structure. For the same reason insulation shouldn t touch the roof s underside.

Insulation is applied in direct contact with the underside of the structural roof sheathing. It spans the rafters to support the roofing and in the case of panel sheathing such as plywood or osb it acts as a diaphragm with the walls to resist horizontal loads. Zip system r sheathing is the simple all in one structural panel with built in exterior insulation. There are three main types of insulating sheathing currently being used in the industry.

This type of insulated roof assembly limits thermal bridging through rafters after installing several layers of rigid foam above the roof sheathing. Scope remove existing roofing and non adhered underlayment to expose roof sheathing. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. In addition to the air permeable insulation installed directly below the structural sheathing rigid board or sheet insulation is installed directly above the structural roof sheathing.

Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing. Also note that a new fully adhered membrane is installed on the original roof deck replacing the one installed 17 years ago is folded down to catch the top edge of the wall water control layer. Foamular family of products brochure pdf v 1588677951000 7 13 mb. A roof over a vented unconditioned attic does not need to include any insulation.