Drywall thickness selection isn't arbitrary — different thicknesses are appropriate for different applications, and in some cases the wrong thickness is a building code violation. Here's the guide for Boston residential applications.
Standard 1/2" drywall is appropriate for interior walls and ceilings in most living spaces with joists or studs at 16" on center. It's easy to handle, accepts joint compound and paint cleanly, and meets code requirements for typical residential applications. 1/2" is the most common thickness in Greater Boston renovation work for walls, and it's the correct choice for most applications. Using 5/8" where 1/2" is sufficient adds cost and weight without benefit. USG drywall panel guide →
Massachusetts building code requires 5/8" Type X fire-rated drywall at: walls and ceilings separating dwelling units in multi-family buildings (1-hour fire rating required), the ceiling of attached garages on the garage side, walls between garages and living space, and in some commercial applications. In Boston's triple-deckers and multi-unit buildings — which make up a huge portion of the housing stock — the party walls and ceiling/floor assemblies between units must use Type X to achieve the required fire rating. Using 1/2" standard drywall in these locations is a code violation that fails inspection. Gypsum Association fire assembly data →
On ceilings where joists are spaced at 24" on center — common in some Boston construction and in many remodeled spaces — 1/2" drywall can sag over time because the span between supports is too wide for the thinner panel. 5/8" drywall is stiffer and resists sag over 24" spans. We use 5/8" on all ceiling applications where joist spacing exceeds 16" on center. The sagging ceiling that needs repainting every few years to hide the deflection marks is almost always a thickness-versus-span problem from the original installation. Georgia-Pacific ceiling drywall →
3/8" drywall is the correct choice when installing drywall over existing plaster walls — a common situation in Boston renovations where plaster is intact but the surface needs renewal. It's thin enough to avoid affecting door and window trim reveal (the exposed face of jamb material visible at window and door openings) while providing a fresh surface for paint. Installing 1/2" over plaster requires extending all door and window jambs to compensate for the added thickness — a significant additional cost that 3/8" avoids. NACHI drywall inspection standards →
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