BASC Search

Right - Raised-heel trusses increase the roof height above the eaves allowing more space for insulation above exterior wall top plates; exterior wall sheathing extends up to keep wind from soffit vents from disrupting insulation.

Image

Right-Wall-insulating sheathing is extended up to roof rafters and sealed around the framing with spray foam

Image

Roof/Attic to Exterior Wall Air Control Upgrade

Guide

Guide describing how to retrofit an exterior wall and/or attic to provide continuous air sealing.

Above Deck Rigid Foam Insulation for Existing Roofs

Guide

Guide describing the installation of insulating sheathing above the roof deck on existing homes. This retrofit assembly is appropriate for homes with conditioned attics or where the retrofit is intended to create a conditioned attic.

To reduce the risk of condensation on the interior of the roof sheathing in cold weather, the ratio of exterior (above-deck) insulation must be increased as a percent of total attic insulation as outside temperature decreases

Image

Closed-cell foam is sprayed into roof cavities along the masonry parapet wall to form a continuous air barrier between the wall and the sheathing of the flat roof

Image

Water Managed Roof – Re-roofing and Adding Insulation Over a Sloped Roof

Guide

Guide describing how to re-roof an existing home with a sloped roof and add insulation above the roof deck.

Lateral Bracing in Gable End Walls

Guide

Guide describing how to brace gable end walls to resist wind pressures.

Flashing of Roof-Wall Intersections in Existing Homes

Guide

Guide describing how to install and properly integrate flashing at the intersection of the wall and roof on an existing home.

Closed-cell spray foam fills the roof joist cavities forming an air barrier between the masonry parapet wall and the roof sheathing

Image

Unvented roof assembly at rake retrofitted with a filler piece and taped top edge of existing house wrap or building paper to seal the top of wall-to-roof transition

Image

The builder installed 1.5 inches of soy-based spray foam on the outside of the walls over the OSB sheathing, then kept a ¾ inch gap between the foam and the brick veneer siding to allow moisture vapor from the bricks to dissipate.

Image

Building in Extreme Cold, BSI-031

Reference

Article describing the control layers (air, thermal, and vapor barriers) needed to build homes successfully in very cold locations.

Unvented roof assembly at eave retrofitted with rigid foam, spray foam, and taped top edge of existing house wrap or building paper

Image

Right - Raised-heel trusses increase the roof height above the eaves allowing more space for insulation above exterior wall top plates; exterior wall sheathing extends up to keep wind from soffit vents from disrupting insulation.

Right-Wall-insulating sheathing is extended up to roof rafters and sealed around the framing with spray foam

Roof/Attic to Exterior Wall Air Control Upgrade

Above Deck Rigid Foam Insulation for Existing Roofs

To reduce the risk of condensation on the interior of the roof sheathing in cold weather, the ratio of exterior (above-deck) insulation must be increased as a percent of total attic insulation as outside temperature decreases

Closed-cell foam is sprayed into roof cavities along the masonry parapet wall to form a continuous air barrier between the wall and the sheathing of the flat roof

Water Managed Roof – Re-roofing and Adding Insulation Over a Sloped Roof

Lateral Bracing in Gable End Walls

Flashing of Roof-Wall Intersections in Existing Homes

Closed-cell spray foam fills the roof joist cavities forming an air barrier between the masonry parapet wall and the roof sheathing

Unvented roof assembly at rake retrofitted with a filler piece and taped top edge of existing house wrap or building paper to seal the top of wall-to-roof transition

The builder installed 1.5 inches of soy-based spray foam on the outside of the walls over the OSB sheathing, then kept a ¾ inch gap between the foam and the brick veneer siding to allow moisture vapor from the bricks to dissipate.

Building in Extreme Cold, BSI-031

Unvented roof assembly at eave retrofitted with rigid foam, spray foam, and taped top edge of existing house wrap or building paper

Moisture Control for Residential Buildings

Low-Slope ("Flat") Roofs

Retrofit of Existing Roofs for Hurricane, High Wind, and Seismic Resistance

Framing of Gable Roof Overhangs

Roof Deck Sheathing and Sealing for Sloped Roofs

Asphalt Shingle Roofs

Metal Roofs