Mold prevention during construction: cover materials, keep dry, dry before close-in, replace wetted materials
BASC Guide — guides/mold-prevention-during-constructionDescription
Construction-phase mold prevention: keep framing materials covered before installation; do NOT install drywall over wet framing (moisture content ≤ 19%); do NOT install insulation over wet framing; ventilate aggressively during paint drying; replace any material that's been wet for > 48 hours. The single most common mold trigger is closing in a wall over wet framing — invisible until 6 months later.
Why this exists
Most production builders are time-pressured to close-in; architects can specify a moisture inspection at framing + before drywall, with a moisture-meter requirement (≤ 19% MC for framing, ≤ 12% for hardwood floors). The inspection takes 30 minutes and prevents a major retrofit.
Categories
Source
Solver enforcement
Browsable only — the solver does not currently enforce this directive (no spec-level data to check against). This entry exists so the architect personas can cite it in conversation and the user can read what the rule says.
Related directives
- Continuous load path from roof to foundation · HUD RSDG §2.4
- Residential structural reliability targets 1-in-100 to 1-in-1000 annual probability of failure · HUD RSDG §2.5
- Residential floor live load: 40 psf minimum (30 psf sleeping rooms) · HUD RSDG §3.4
- Wind load design uses ASCE 7 basic wind speed for the locality · HUD RSDG §3.6
- Ground snow load for Virginia: 25 psf eastern, up to 40 psf western mountains · HUD RSDG §3.7
Last reviewed 2026-05-15.