Indoor airPLUS

Technical Guidance to the Indoor airPLUS Construction Specifications

1. Moisture Control

Please see "How to Use This Guidance".

Sections 1.1 - 1.4

Water-Managed Site and Foundation

Sections 1.5 - 1.6

Water-Managed Wall Assemblies

Sections 1.7 - 1.10

Water-Managed Roof Assemblies

Sections 1.11 - 1.13

Interior Water Management

Sections 1.7 - 1.10: Water-Managed Roof Assemblies

1.9 Install Self-Sealing Bituminous Membrane

Install self-sealing bituminous membrane or the equivalent at all valleys and roof decking penetrations for durability at potential failure points.

Exception: Dry climates, as shown in IECC Figure 301.1.

Detailed Illustrations

Click on the image for a full-page version
Membrane protection of roof valley (Option 1)	Metal coil stock flashing formed at valley	Workers installing "peel and stick" membrane-material in roof valley Source: Building Science Corporation, Westford, MA
Step 1 of 4 - Plumbing vent stack - "peel and stick" membrane	Step 2 of 4 - Shingles placed over membrane and felt	Step 3 of 4 - Flashing cap placed over pipe and integrated with shingles
Step 4 of 4 - Shingle courses covering upper half of pipe flashing cap

Why

Please refer to the Construction Specifications 1.9 Install self-sealing bituminous membranes..."

Eaves, valleys, and penetrations are more vulnerable to wear and water damage from rain and ice than are other portions of sloped roofs. Failure in the roof system results in water leaking into the home. Water stains may signal leaks, but many times the leak can go unnoticed while mold grows on insulation and other building materials. The self-sealing bituminous membrane adds a significant layer of protection to the roof system at these locations. Follow the manufacturer's recommendations.

How

Self-sealing membranes (sometimes referred to as "peel-and-stick membranes") are installed first to the roof sheathing. Then other roofing products, such as building papers, are integrated.

Refer to the Map of Climate Zones to determine "Dry Climates," and consult code officials when local climate conditions might dictate the need for protection from ice dams.

Top of page