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
- 1.7 Direct Roof Water Away from House
- 1.8 Fully Flash Roof-Wall Intersections
- 1.9 Install Self-Sealing Bituminous Membrane
- 1.10 Install Self-Sealing Bituminous Membrane in Cold Climates
- BEST PRACTICE: Roofing Underlayment Upgrade
- BEST PRACTICE: Roof Drip-edge
- BEST PRACTICE: Wind Baffles - Attic Insulation
Sections 1.11 - 1.13
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.
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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.
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.