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Install all layers of the drainage plane to overlap, not underlap, to direct bulk water down and out of the wall.

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Measure Guideline: Deep Energy Enclosure Retrofit (DEER) for Zero Energy House (ZERH) Flat Roofs

Reference

This Measure Guideline provides design and construction information for a deep energy enclosure retrofit solution of a flat roof assembly.

Application of Spray Foam Insulation Under Plywood and Oriented Strand Board Roof Sheathing, BA-1312

Reference

Report covering moisture and leakage issues associated with spray foam insulation application to the underside of roof sheathing.

Water Management of Non-Insulating and Insulating Sheathings - Final Report

Reference

Report summarizing current research, summarizes issues that have been experienced with current best practices, and recommends ways in which the best practices can be improved for water managing sheathings.

Rigid foam insulating sheathing installed over an existing garage ceiling with retrofits to air seal exterior wall before adding exterior wall insulating sheathing

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Unvented roof assembly at eave retrofitted with rigid foam, spray foam, and a fully adhered membrane seal at the top of wall-to-roof transition

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Lower wall insulation installation

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Taped vertical joint of lower wall insulation

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Upper wall insulation installation

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Sloped roof with cavity spray foam insulation, strapping, and gypsum board thermal barrier

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Install minimum 6" wide self-adhered butyl Z-flashing

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Upper wall insulation installation with butyl z-flashing

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Flat roof with cavity spray foam plus loose-fill insulation and gypsum board thermal barrier.

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Water management detail for a solar panel rack mounting block installed in rigid foam that was installed over an existing roof

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Clean taping areas and install 3" tape on vertical joint of upper insulation overlapping the horizontal joint

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Sloped roof with cavity spray foam insulation sprayed on underside of roof deck and covered with sprayed-on thermal or ignition barrier coating.

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Tape horizontal joint with minimum 3" wide tape placing tape offset high on the joint, adhearing to the upper sheet without wrinkles

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Terminate 4" tape with 2" wide tape placing tape offset high on the joint, 2/3 of the tape should be adhered to the sheet of insulation

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Tape the joint between the top insulation sheet and the Z-flashing with 2" wide tape to improve air tightness

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