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Taped Insulating Sheathing Drainage Planes

Guide

Guide describing techniques for installing insulating sheathing as a continuous drainage plane on walls.

Upper wall insulation installation with butyl z-flashing

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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.

Trade-Friendly Retrofit Insulated Panels for Existing Buildings, Albany New York

Reference

Case study about a structural sheathing product composed of enhanced EPS rigid foam with OSB adhered on one side.

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

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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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Right – The flashing is properly installed to create a complete drainage system with continuous rigid insulation sheathing/siding

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This farmhouse was retrofit by removing the existing siding and adding taped insulated sheathing and battens before installing new siding

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Windows are installed as “outies” in this wall assembly using a self-adhered membrane water and air control layer with continuous exterior insulation

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Step 1. Apply roof underlayment over roof deck and up the sidewall over the rigid foam insulation

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This house design in the Hot-Humid climate uses a slab foundation, masonry walls, and an Exterior Insulation Finish System (EIFS) cladding.

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Step 5. Apply self-adhesive flashing over top edge of the wall flashing, diverter, and rigid foam insulation

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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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This drawing shows key head details for a window installation using a fluid-applied flashing on a wall with a mechanically attached water and air control layer and continuous insulation

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This drawing shows key jamb details for a window installation using a fluid-applied flashing on a wall with a mechanically attached water and air control layer and continuous insulation

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This drawing shows key sill details for a window installation using a fluid-applied flashing on a wall with a mechanically attached water and air control layer and continuous insulation

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This drawing shows key head details for an “outie” window installation using a fluid-applied flashing on a wall with a fluid-applied water and air control layer and continuous insulation

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This drawing shows key jamb details for an “outie” window installation using a fluid-applied flashing on a wall with a fluid-applied water and air control layer and continuous insulation

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This drawing shows key sill details for an “outie” window installation using a fluid-applied flashing on a wall with a fluid-applied water and air control layer and continuous insulation

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Right - Permeable rigid mineral wool insulation and appropriate water-management flashing details are integrated with new rigid foam siding to keep water away from the sill beam above the foundation wall

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Proper flashing around windows is especially important when the rigid foam serves as the drainage plane in the wall

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Mastic Home Exteriors Installation Guide

Reference

Siding installation guide for Ply Gem Siding Group products.

The retrofitted flat roof has PV panels and walking mats installed over the roofing membrane

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Concrete Slab over Polyethylene

Video

Video describing concrete slab over polyethylene barrier.

Flashing of Wall Penetrations in Existing Homes

Guide

Guide describing how to install flashing that is integrated with air and water control layers around piping, vents, and other wall penetrations as part of an exterior wall retrofit.

Install minimum 6" wide self-adhered 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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This exterior wall retrofit permits drying to the exterior of a sill plate installed on an untreated flat foundation wall

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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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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.