Green Building How To Build A Conditioned Attic

You can reduce dust buildup using an unvented attic versus a vented attic.

Green building how to build a conditioned attic. This has several advantages including less air transfer and what air does transfer is conditioned. An unvented attic assembly a k a. My name is matt risinger of risinger homes and welcome to my video blog on green building and building science topics. The irc has permitted unvented conditioned attics since 2006 with certain requirements.

My original plan was to build a conditioned attic and place 1 5 of foam xps board r7 5 installation on top of the roof deck and fill the old true 2x4 rafters and rafter walls with closed cell insulation and if able attach 3 of foam xps board r15 to the rafters in the attic. Unvented attics are built with insulation of the attic is placed at the roof level and the area inside the attic is a conditioned space. Check out our latest creation. 5 dumb ways to build in the south.

Code requirements vary across the country. Compact assembly or hot roof ventilated roof assembly you can insulate the rafter space provided that you leave a ventilation space between the top of the insulation typically fiberglass batts or blown cellulose and the underside of the roof sheathing section r806 1 ventilation required. During the 1990s the building science corporation received funding from the u s. One of them is what to do about the attic.

The roof deck in an unvented attic must be exceptionally airtight. The acceptance of unvented conditioned attics continues to grow among builders and building officials. Watch this if you ve not seen it. In warmer climates unvented attics can prevent the condensation that occurs on ductwork in some vented attic spaces.

That decision he writes has added a whole new level of complexity to his building process. Department of energy through the building america program to research conditioned attics in nevada and texas.