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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

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Technology Solutions Case Study: Field Testing an Unvented Roof with Fibrous Insulation and Tiles

Case Study

Case study describing field testing of an unvented roof with fibrous insulation and tiles.

On top of the ice-and-water shield, the builder installed horizontal beams that were raised 6 inches off the deck to allow room for spray foam insulation.

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Retrofit an existing roof by installing rigid foam above the roof deck with a ventilation space between the rigid foam and the new roof sheathing plus new moisture and air control layers and cavity insulation in the roof rafters.

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Condensation Control in Attics and Roofs in Cold Weather

Guide

Guide describing causes of condensation in attics and roof assemblies during cold weather and ways to reduce this condensation.

Pre-Retrofit Assessment of Attics, Ceilings, and Roofs

Information Guide

Information guide describing things to consider in the attic, ceiling, or roof before attempting retrofits of items including HVAC, wiring, or structural systems.

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.

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Venting Vapor, BSI-088

Reference

Guide providing information on controlling attic ductwork sweating.

Hurricane Straps

Video

Video describing hurricane ties and how they make your home more ready for severe weather by strengthening structural connections.

Moisture Control for Residential Buildings

Reference

Report providing extensive guidance on controlling moisture in building envelopes through proper selection and installation on air, water, thermal, and vapor barriers.

Field Evaluation of Four Novel Roof Designs for Energy-Efficient Manufactured Homes

Reference

Report of a field evaluation of four novel roof designs to see how each design would reduce space-conditioned energy use so that the knowledge gained could be applied to the design of new manufactured homes.

Disaster-Resistant Roof Venting

Guide

Guide describing the installation of roof vents that are resistant to damage from high winds and entry of wind-borne rain, wildfire embers, or pests.