Insulating Underside Of Roof Deck

This retrofit assembly is appropriate for homes with conditioned attics or where the retrofit is intended to create a conditioned attic.

Insulating underside of roof deck.

If you re insulating from scratch put the right vapor barrier in the right place. Our deck has been updated to a three season porch. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. Insulating the underside of deck.

For some building uses the ceiling might be absent. Low slope and steep slope unvented roof systems i e. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. Remove existing roofing and non adhered underlayment to expose roof sheathing.

Fiberglass insulation is installed between the rafters as shown schematically below. This type of system can also be found in low slope residential buildings in inner city areas. This construction approach was first used in the 1970s and it has been implemented much more widely since it was first included in the international code council s icc model building code in 2007 irc section 806 4. For the same reason insulation shouldn t touch the roof s underside.

It is about three feet off the ground and has mesh stapled to the underside to prevent bugs from making their way in. It will help you to eliminate problems that may come when the house becomes extremely cold in the winter and terribly hot in the summer. A wood deck roof system. In addition to installing the foam board on the underside of the roof deck you can attach it to the bottom edges of the rafters in the same manner you would hang drywall.

Insulation and air barrier are applied directly to the underside of the roof deck are common in applications where designers are seeking cost effective and energy efficient roof assemblies. Install insulating sheathing above the roof deck on existing homes.