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New GBA Details for ‘Juliet’ Balconies

If you’re planning a second-floor balcony, use these details to avoid thermal bridging and moisture entry problems

Posted on Apr 16 2013 by GBA Team's library of construction details continues to expand. The latest two additions are details for second-floor balconies.

Many second-floor balconies — especially those created by cantilevering floor joists — leak heat and admit water. To avoid problems with air leakage, thermal bridgingHeat flow that occurs across more conductive components in an otherwise well-insulated material, resulting in disproportionately significant heat loss. For example, steel studs in an insulated wall dramatically reduce the overall energy performance of the wall, because of thermal bridging through the steel. , and moisture entry, use one of the following details:

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The new details for second-floor balconies, like most details on the GBA website, are available only to GBA Pro members.

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