Indoor Air Package Pilot Specification - April 4, 2005

1. Moisture Control Required Measures References Water Managed Roofs

1.1Provide Minimum No. 30 roof felt under layment or equivalent.

1.2 In IECC 2004 Climate Zones 5 and higher, provide self sealing water protection membrane ice flashing over the sheathing at the eave extending 2 feet inside the exterior wall plane.

1.3 Provide metal drip edge at all exposed roof decking.

1.4 Provide self-sealing bituminous membrane at all eaves, valleys and penetrations except in climates with less than 20 inches annual rainfall.

1.5 Provide Insulated wind baffle or other air barrier to block wind washing at all attic eave bays in roof assemblies with soffit vents.

1.6 Provide step flashing at all intersections of roof and walls with the exception of continuous flashing at metal and rubber membrane roofs. Metal “kick-out” flashing shall be provided at the end of roof/wall intersections to direct water away from wall. Drainage plane above shall be directed water flow onto and not behind flashing. Intersection wall siding shall terminate a minimum of 2 inches above roof. HUD/NAHB specs for gutters and downspouts

1.7 Direct roof water from house with either:

Guttering and downspouts shall empty to lateral piping that deposit(s) water on finish grade a minimum of 5 ft. from foundation, or in limited spaces, deposit to underground catchment system that carries water 10 ft. from foundation.

In dry climates with less that 20 inches annual rainfall as shown in EEBA Builder Guides, provide minimum 18” roof overhangs that deposit water to grade sloped away from home.

References

Copper Development Assn. Design Handbook, Sec. 4

Moisture Control Handbook
IRC

EBBA Builder Guide
Moisture Control Handbook

EEBA Builder Guide
EEBA Water management Guide

IRC code 801.c
EEBA Builder Guides

HUD/NAHB specs for gutters and downspouts
Moisture Control Handbook
IRC