Level 4 is the default smooth wall. Level 5 is the full-surface skim. The fight is almost never the coat count. It is critical light, sheen, dark paint, and a punch photo taken at an angle the superintendent did not stand in at noon. The document is GA-214 (Recommended Levels of Finish for Gypsum Board, … Read more
Width and length are a joint count, a lift decision, and a waste factor — not a brand preference. 48-inch (4-ft) is the default gypsum width in North America. 54-inch exists because two horizontals make 108 inches (9 ft) without a filler strip. Lengths in common mill runs are 8, 10, 12, 14, and 16 … Read more
The deck will move. Live load, concrete creep, camber coming out, a roof that ponds — the head of an interior partition is where that movement shows up. Slotted and deep-leg deflection track exist so the stud wall can stay plumb while the structure above goes up and down. Hard-screwing the gypsum to that head … Read more
Interior wallboard is a paint substrate. Exterior gypsum sheathing is a cladding substrate. Mixing those jobs is how a shop tapes DensGlass-class joints like a Level 4 corridor, or how a GC assumes the weather-resistive barrier started when the board went on. This page is for the drywall / wall-and-ceiling sub who hangs glass-mat or … Read more
Cavity batt in a steel stud is not the envelope. Steel is a thermal short. IECC and ASHRAE 90.1 name continuous insulation (ci) as insulating material continuous across structural members, uncompressed, with no thermal bridges other than fasteners and service openings — outboard, inboard, or integral to the opaque wall. That is the definition. It … Read more
The same mill will deliver interior drywall stud and exterior cold-formed steel to the same site. They are not the same bid. Interior light-gauge is the partition the commercial drywall sub already carries. Exterior CFS is backup, curtain wall, or load-bearing — wind, axial load, sheathing, a different ASTM family. Mixing them is how a … Read more
The screw on the gun is not “a drywall screw.” It is a thread, a point, and a standard. Fine thread into wood still bites; coarse thread into 25-ga steel walks or strips. That is how a hang fails before the taper opens a box. This page restates public class language from ASTM C1002 (self-piercing … Read more
On a commercial wall-and-ceiling bid the ceiling is often two trades wearing one company name. ACT (acoustical ceiling tile — grid and lay-in) is not a gypsum ceiling with a different finish. Gypsum is hang, tape, and a GA-214 level. Between them sits drywall-suspension: steel tees that take board, not tile. This page is takeoff … Read more
Cavity shaftwall and area-separation walls are why a commercial drywall sub owns 1-inch liner, J-runners, and a stud that is not a 3-5/8 drywall C. Both systems are erected from the accessible side. Both fail inspections when someone hangs leftover 5/8 Type X and calls it liner. This page is a field and takeoff sequence. … Read more
A drywall sub does not buy a “drywall kit.” The hang crew, the taper, and the metal-stud foreman each run a different cart, and the mix on a production house is not the mix on a commercial corridor. This is a field-and-shop briefing on the production tools those people actually order — stilts, panel lifts, … Read more