Residential Oversheathing Roof Insulaiton

With this kind of roof the insulation follows the slope of the roof.

Residential oversheathing roof insulaiton.

Nail it around the edges with roofing nails. If you prefer not to use rigid foam you can use mineral wool panels instead. Over roof insulation the gable overhang has been cut flush with the wall sheathing. The boards are available in several thicknesses and r values.

With more than 60 years of being used nation wide insulfoam roof insulations are a proven value. Rigid insulation sheathing is made of a rigid plastic foam that is typically sold in 4 8 or 4 10 foot boards. Don t let your heating costs go through the roof. 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.

Continuous rigid insulation is a construction solution that provides a thermally efficient building enclosure. This concept while not new has become more accepted in recent years and is being used in residential construction. Remove existing roofing and non adhered underlayment to expose roof sheathing. Start at the bottom of the roof and place the first piece of rigid foam insulation against the metal flashing starting at the center line.

Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. Residential roof insulation insulfoam offers a wide variety of faced laminated and standard high performance eps insulation products for all your new and re roofing needs. Lstiburek takes blame for bad language. It s not coming from above the roof and it s not some new moisture source resulting from the spray foam.

A roof over a vented unconditioned attic does not need to include any insulation. This retrofit assembly is appropriate for homes with conditioned attics or where the retrofit is intended to create a conditioned attic. 1 inch and 2 inch thicknesses are common. For more information on this option see installing mineral wool insulation over exterior wall sheathing.

Moisture generated indoors or that infiltrates into the home is responsible for the bulk of the moisture in an attic insulated with spray foam on the underside of the roof sheathing. However most cathedral ceilings and low slope flat roofs are insulated roof assemblies. In cold climates the use of exterior rigid insulation sheathing boards has been a method of increasing thermal performance of the enclosure as well as a means of reducing the condensation potential within exterior wall assemblies.