ATLANTA — New construction that incorporates building science best practices for moisture management can significantly reduce the risk of mold growth over the life of the building — but many builders still use construction practices that create conditions favorable to mold development.
The most important factor in mold prevention in new construction is controlling moisture during the construction process itself. Framing lumber and other wood-based materials that get wet during construction and are enclosed before drying can develop mold growth within days, creating a hidden mold problem in a brand-new building.
Building science best practices for moisture management in new construction include using moisture-resistant materials in high-humidity areas, designing continuous air barriers to prevent moisture-laden air from entering wall cavities, sizing HVAC systems correctly to ensure adequate dehumidification, and installing vapor retarders appropriate to the climate zone.
The International Building Code and the International Residential Code include moisture management requirements that have been strengthened in recent editions, reflecting the growing understanding of the relationship between building science and indoor air quality. Builders who comply with the latest code editions are building more mold-resistant structures.
Homebuyers should ask builders about their moisture management practices and request documentation of any moisture testing performed during construction. Several states require builders to provide a warranty covering mold resulting from construction defects, and buyers should understand the scope and duration of this warranty before closing.
