Green Building How To Build A Conditioned Attic

The loss of energy efficiency means some designers choose to move the ductwork into the conditioned areas of the home and leave the attics unvented.

Green building how to build a conditioned attic.

This has several advantages including less air transfer and what air does transfer is conditioned. Watch this if you ve not seen it. You can reduce dust buildup using an unvented attic versus a vented attic. In warmer climates unvented attics can prevent the condensation that occurs on ductwork in some vented attic spaces.

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. The acceptance of unvented conditioned attics continues to grow among builders and building officials. Department of energy through the building america program to research conditioned attics in nevada and texas. 5 dumb ways to build in the south.

An unvented attic assembly a k a. During the 1990s the building science corporation received funding from the u s. After experimenting with cellulose insulated roof assemblies and fiberglass insulated roof assemblies lstiburek began promoting conditioned attics. The roof deck in an unvented attic must be exceptionally airtight.

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. Check out our latest creation. That decision he writes has added a whole new level of complexity to his building process. 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.

Code requirements vary across the country. One of them is what to do about the attic.