Build a Better Home: Moisture-Resistant Wall Construction

Preventing moisture from getting trapped inside the building envelope is key to constructing long-lasting homes that stay dry and comfortable. Walls are an integral part of this weather-resistive system. Designing and constructing wall details correctly, particularly around window and door openings, can prevent harmful moisture build-up whether the moisture originates from outside or inside the building. 

This publication is designed for: architects, designers, builders, homeowners, contractors

This publication outlines the two primary sources of moisture in wood wall construction—water leaks and vapor-laden air that penetrates the wall to produce condensation—and methods to prevent its accumulation. 

Key sections include:

• Avoiding moisture accumulation in walls

• How water leaks into wood wall construction

• Preventing leaks with flashing

• Water-resistive barriers

• Caulking as a waterproofing component

• Installing rain screen walls

Published by APA — The Engineered Wood Association.