Drywall Finishing Plan
One figure covers all three coats. Do not multiply by the number of coats.
BFCBrilliance · bfcbrilliance.com/tools/joint-compound-calculator
The job
- Date
- Room
- Drywall area
- Sheet size
- SHEETS
- Coverage
- Waste %
- GALLONS
- Pail size
- PAILS
- Product
- Production date code
- Finish level
Manufacturer coverage (USG submittal sheets)
- Sheetrock All-Purpose (J1969)
- approx 10 gal / 1,000 sq ft
- Sheetrock Total (J1508)
- approx 10 gal / 1,000 sq ft
- Plus 3 Lightweight (J498A)
- approx 9.4 gal / 1,000 sq ft
- All-Purpose Midweight (J963)
- approx 9.4 gal / 1,000 sq ft
- Which is
- about 1 gal per 100 sq ft
- Per 4x8 sheet
- about 0.32 gal
- ⚠ That figure covers
- ALL THREE COATS — do not multiply
- ⚠ Beware the claim
- 30 gal/1,000 sq ft — wrong by 3x
- Quoted per
- sq ft of PANEL, not length of joint
- Level 5 skim coat
- MORE — priced separately (USG J2010)
- Setting-type (hot mud)
- sold DRY by weight — different sum
- Pack sizes
- 4.5 gal pail; 3.5 and 4.5 gal cartons
- Shelf life
- about 9 months from manufacture
- Standard
- ASTM C475
The three-coat sequence
- Screws set just below the surface, none tearing the paper
- Gaps over 1/4 in prefilled with SETTING compound first
- Coat 1 — bed the tape, squeezed down, no trapped air
- Corner bead fixed before any finishing coat
- Fully dry before the next coat — not just touch dry
- Coat 2 — feathered about 2 in past the first
- Coat 3 — feathered about 2 in past the second
- Fasteners and corners given three coats too
- Sanded lightly between coats, not aggressively
- Dust controlled — a wet sponge beats a sander indoors
- Primed before paint — bare compound and paper absorb differently
One figure, all three coats
Unlike paint, the manufacturer's coverage is for the whole finishing job — bedding, second coat, third coat, fasteners and corners. Multiplying by three is the commonest overbuy on this material.
Why this page cites a document number
Published coverage figures for joint compound disagree threefold — 1 gal per 100 sq ft against 30 gal per 1,000. The manufacturer's submittal sheets settle it at 9.4-10 gal per 1,000 sq ft, and 10 per 1,000 is exactly 1 per 100. Take the number off the pail you are buying.
Level 5 is not this number
Level 4 is the ordinary finish and what the coverage assumes. Level 5 skims the entire surface, not just the joints, and uses substantially more. USG points at a separate document for it rather than putting a figure on the pail — so price it separately.