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The “down” and “out” approach to flashing – metal flashing directs water down and out of building assemblies

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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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Installing Windows with Foam Sheathing on a Wood-Frame Wall

Reference

Report with guidance for installing windows with foam sheathing on wood-frame walls.

Plan view of duct or pipe penetration through exterior wall showing flashing and air sealing details

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Section view of duct or pipe penetration through exterior wall showing flashing and air sealing details

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Plan view of electric box installation in exterior wall showing flashing and air sealing details

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Section view of electric box installation in exterior wall showing flashing and air sealing details

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Existing wall-to-lower roof transition retrofitted with a new strip of fully adhered air control transition membrane, new step flashing, new roof underlayment, and new cladding

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Existing wall-to-lower roof transition with a new strip of fully adhered air control transition membrane, new step flashing, new roof underlayment, and new cladding – view from eave

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Existing wall-to-lower roof with attic transition with a new strip of fully adhered air control transition membrane, new step flashing, new roof underlayment, and new cladding – view from eave

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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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Right – Two-thirds of acrylic tape is offset above the joint and over and above the fasteners

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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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Measure Guideline: Guidance on Taped Insulating Sheathing Drainage Planes

Reference

Measure Guideline research report providing simple, long term, and durable solutions when using tapes and flashing membranes in conjunction with the exterior face of rigid polymeric foam sheathing to create the drainage plane of a wall system.

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

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Rigid foam insulation can serve as the drainage plane when all seams are taped. Furring strips provide an air gap behind the cladding.

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Right – two-thirds of the blue butyl flashing tape is above the sheathing seam; the top edge of the butyl flashing tape is covered with clear sheathing tape that is also offset so two-thirds is above the top edge of the butyl flashing.

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Chimneys Connected to Roof Structure

Guide

Guide providing information about flashing around a chimney to protect the intersection of the roof and chimney walls from water intrusion and anchoring of a chimney to prevent collapse in high winds.

Flashing of Penetrations in Existing Roofs

Guide

Guide describing how to provide a continuous water control layer across the roof assembly by sealing all penetrations for pipes, vents, etc. in existing roofs.