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Examples of many common ceiling penetrations that will be difficult to insulate and air seal in this cathedral ceiling.

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All holes through the top plates should be sealed with canned spray foam to prevent conditioned air from leaking into the attic.

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The polyethylene ceiling vapor barrier is sealed to form an air barrier around the exhaust fan in this very cold climate location (≥ CZ 6).

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Roof Eaves Sealed with Self-Adhering Membrane in Cold Climates

Guide

Guide describing how to apply self-adhered asphaltic membranes at eaves in cold climates to help guard against ice dams.

Construct Roofs and Attics for Ice Dam Prevention

Guide

Guide describing how ice dams form and how roofs can be constructed to prevent them.

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.

Attic Eave Minimum Insulation

Guide

Guide providing guidance on insulating attic eaves in new and existing single-family homes and multifamily buildings.

De-Icing Ice Dams, BSI-097

Reference

Article describing the importance of air sealing, insulation, and roof ventilation in reducing the likelihood of ice dam formation on roofs in cold snowy climates.

Managing Snow Loads on Roofs and Decks

Guide

Guide describing how to construct homes and decks to manage heavy snow loads in winter weather.