Sheet Goods Take-Off
Count by layout, check both directions, then check the structural direction overrules neither of them.
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The job
- Project
- Date
- Material and thickness
- Sheet size
- Area length
- Area width
- SHEETS (as laid)
- Sheets (turned)
- Price per sheet
- Total
One row per area — record BOTH orientations
| Area | Length | Width | Sheets (as laid) | Sheets (turned) | Direction required? |
|---|---|---|---|---|---|
The arithmetic
- Sheets by layout
- ceil(length / sheet length) x ceil(width / sheet width)
- Turned
- ceil(length / sheet WIDTH) x ceil(width / sheet LENGTH)
- By area (comparison)
- area x (1 + waste) / sheet area, rounded up
- Standard sheet
- 4 x 8 ft = 32 sq ft
- ⚠ 16 x 12 area
- 6 sheets one way, 8 the other, 7 by area
- Expansion gap
- about 1/8 in between sheets — not in the count
Before ordering
- Both orientations counted and compared
- Structural direction checked — long edge across joists or rafters
- Joints staggered between rows, brickwork style, not aligned
- Expansion gap planned, even though it changes no count
- Thickness confirmed against the span and the load
- Grade chosen — exterior, interior, or a rated sheathing
- One spare sheet considered for the one that gets damaged
- Vehicle checked — a 4x8 sheet does not fit in most cars
- Two people arranged; sheets are heavy and awkward alone
Area is a check, layout is a count
Dividing by 32 assumes every offcut finds a home. Covering a plane surface, most of them do not — a 2 ft strip from one row is no use in the next if that row needs a full sheet. Use the area figure to sanity-check the layout figure, and buy against the layout.
The cheap direction is not always allowed
Turning the sheets can save two on a small job, and on a subfloor or roof it is frequently not your decision — the long edge runs across the joists so each sheet spans several, and the joints stagger between rows. Work out the cheap answer, then find out whether the structure permits it.