Drywall Hanging in Miami

Standard board, Type X fire-rated, moisture- and mold-resistant, impact-resistant and abuse-resistant are different products with different jobs. A wet area gets moisture-resistant board. A corridor in a building that will take carts and furniture gets impact-resistant. A rated assembly gets the specific Type X the listing was tested with, in the number of layers the listing specifies.

Substituting down is invisible on the day and matters enormously later — at an inspection, at a mould claim, or the first time somebody puts a hand truck through a wall.

Ceilings before walls, so the wall board supports the ceiling edge. Joints staggered rather than stacked. Fasteners set to the right depth — driven too deep they tear the paper and lose their hold, not deep enough and they telegraph through the finish. Board run perpendicular to framing where the assembly calls for it.

None of this is exotic. It is the ordinary craft of the trade, and it is the reason two walls built from identical materials can look completely different under a lamp.

South Florida humidity is hard on ceilings. Half-inch board on twenty-four-inch centres will sag over time in this climate, particularly with insulation loaded on top of it. Ceiling board is either 5/8 inch, or half-inch sag-resistant product rated for the span, or the framing gets tightened up.

It is a cheap decision at framing stage and an expensive one to revisit, because revisiting it means the ceiling comes down.