What Type and Thickness of Drywall Should Be Used in Boston Homes?

Standard Drywall: Where It's Appropriate

Standard 1/2" drywall is appropriate for interior walls and ceilings in most living spaces — bedrooms, living rooms, hallways, and above-grade finished basements. It's easy to work with, accepts joint compound and paint cleanly, and meets code requirements for typical residential applications. 3/8" drywall works for re-skimming over existing plaster walls — thin enough not to affect door and window trim reveal. USG drywall product guide →

5/8" Type X: Fire-Rated Applications in Boston Multi-Family

Massachusetts building code requires 5/8" Type X fire-rated drywall in specific locations in multi-family buildings and attached garages. In Boston's triple-deckers and multi-unit buildings, wall and ceiling assemblies separating units must achieve a 1-hour fire rating — typically requiring 5/8" Type X on both sides. The ceiling of an attached garage requires 5/8" Type X on the garage side. Using 1/2" standard drywall in these locations is a code violation that fails inspection. Gypsum Association fire assembly data →

Moisture-Resistant Drywall: What It Is and Isn't

Moisture-resistant drywall (greenboard, purple board) is appropriate for bathroom walls outside direct water contact — vanity walls, toilet compartments, areas that see humidity but not direct splash. It is not appropriate as a tile backer in showers or tub surrounds. Tile installation standards specifically prohibit standard moisture-resistant drywall in wet areas. Cement board or bonded waterproof membrane panels are required at direct-water-contact locations. This distinction matters enormously — greenboard behind shower tile is a failure we find regularly during Boston bathroom remodels. Georgia-Pacific drywall products →

Sound-Reducing Drywall for Boston Multi-Family

Boston's dense multi-family housing creates significant sound transmission issues between units. QuietRock and similar products use a constrained-layer damping core that reduces sound transmission significantly over standard drywall. For Boston condo conversions and apartment renovations where sound isolation matters, these products combined with resilient channel mounting and acoustic insulation can achieve STC 50–55 — a meaningful improvement over the STC 30–35 of typical single-layer drywall. QuietRock sound-reducing drywall →

Ceiling Thickness in Boston Homes

Standard 1/2" drywall on ceilings with joists 24" on center can sag over time, particularly if the space above is humid. 5/8" drywall on ceilings is stiffer and sags less — we use it on all ceilings with joist spacing over 16" on center. On older Boston homes being re-drywalled over furring strips, the span calculation is even more critical. Getting the right product in the right location is the difference between a ceiling that stays flat for 20 years and one that needs repainting to hide sag marks within five. NACHI drywall inspection standards →