Insulation Over 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.

Insulation over roof sheathing.

The plywood was fastened through the rigid. There are three main types of insulating sheathing currently being used in the industry. Install rigid insulation board in multiple layers with joints offset vertically and. 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.

Featuring integrated moisture air and thermal protection zip system r sheathing completely reimagines traditional wall assemblies by streamlining exterior water air and thermal management. Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof. Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away.

This type of insulated roof assembly limits thermal bridging through rafters after installing several layers of rigid foam above the roof sheathing. 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. Insulation is applied in direct contact with the underside of the structural roof sheathing. Scope remove existing roofing and non adhered underlayment to expose roof sheathing.

Over roof insulation the gable overhang has been cut flush with the wall 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. For the same reason insulation shouldn t touch the roof s underside. Zip system r sheathing is the simple all in one structural panel with built in exterior insulation.

Expanded polystyrene eps extruded polystyrene xps and polyisocyanurate polyiso. Request a product sample where to buy contact a rep. If plywood or osb sealing the panel edges with acrylic tape over primer or a fluid applied membrane would be good options. If the sheathing is boards it s a good place for a self adhered membrane.