Residential Oversheathing Roof Insulaiton

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.

Residential oversheathing roof insulaiton.

This retrofit assembly is appropriate for homes with conditioned attics or where the retrofit is intended to create a conditioned attic. It s not coming from above the roof and it s not some new moisture source resulting from the spray foam. With this kind of roof the insulation follows the slope of the roof. For more information on this option see installing mineral wool insulation over exterior wall sheathing.

If you prefer not to use rigid foam you can use mineral wool panels instead. 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. Rigid insulation sheathing is made of a rigid plastic foam that is typically sold in 4 8 or 4 10 foot boards. Remove existing roofing and non adhered underlayment to expose roof sheathing.

With more than 60 years of being used nation wide insulfoam roof insulations are a proven value. 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. This concept while not new has become more accepted in recent years and is being used in residential construction. 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.

However most cathedral ceilings and low slope flat roofs are insulated roof assemblies. 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. Over roof insulation the gable overhang has been cut flush with the wall sheathing. A roof over a vented unconditioned attic does not need to include any insulation.

Insulated roof assemblies can be vented or unvented. Continuous rigid insulation is a construction solution that provides a thermally efficient building enclosure. Nail it around the edges with roofing nails. The boards are available in several thicknesses and r values.

Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. Install insulating sheathing above the roof deck on existing homes. Don t let your heating costs go through the roof.