Drywall & Stud Takeoff for a 20×20 Room (8ft Ceiling)
Deterministic bill of materials for framing and sheetrocking a 20ft × 20ft × 8ft enclosure (20×20 ft Room (2-Car Attached Garage, Workshop, or Large Bonus Room)). Calculated with 1 standard door and 1 window deduction, plus a 10% lumber and drywall cutting allowance per Gypsum Association guidelines.
or 24 sheets of 4×12
or 64 studs @ 24" O.C.
4.5-gal bucket + 2 roll tape
~3.9 lbs (1-1/4" Bugle Coarse)
Architectural Bill of Materials (Takeoff Summary)
Detailed quantities including 10% scrap/waste allowance for a 20ft × 20ft × 8ft space.
| Material Assembly | Standard Spec | Net Takeoff Qty | Code / Installation Notes |
|---|---|---|---|
| Drywall Panels (Standard 4×8) | 1/2" Gypsum Sheetrock (32 sq ft/sheet) | 35 sheets | Includes 10% cutting waste allowance |
| Drywall Panels (Long 4×12) | 1/2" Gypsum Sheetrock (48 sq ft/sheet) | 24 sheets | Recommended to minimize butt joints |
| Framing Studs (16" O.C.) | 2×4 × 8ft Kiln-Dried Lumber | 86 studs | Field + 4 California corners + door/window trimmers |
| Top & Bottom Plates | 2×4 Lumber (12ft lengths) | 20 boards | IRC Section R602.3 — Double top plate with 24" offset lap joints |
| Joint Compound Ready-Mix | All-Purpose Mud (4.5-Gallon Bucket) | 3 bucket(s) | Covers taping, block, and skim coat (Level 4) |
| Drywall Joint Tape | Cross-Fibered Paper Tape (250 ft Roll) | 2 roll(s) | Embedded in bedding coat |
| Fastener Screws | 1-1/4" Coarse Thread Bugle Head | 1176 pcs | 12" O.C. on ceilings, 16" O.C. on sidewalls (Type W screws) |
Complete framing rough-in, board hanging, and 3-coat taping to Level 4 smooth finish.
Wholesale lumber, 1/2" drywall boards, fasteners, and finishing compounds (US National Average).
Optimized for clean 2-day turnaround without scaffolding or specialized drywall lifts.
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Frequently Asked Questions: 20ft × 20ft × 8ft Drywall Takeoff
How many sheets of drywall do I need for a 20x20 room with 8ft ceilings?
For a 20×20 ft room with 8 ft ceilings (walls and ceiling), you will need approximately 35 standard 4×8 drywall sheets (or 24 extended 4×12 sheets). This estimate includes standard door/window deductions and a 10% cutting waste factor recommended by the Gypsum Association (GA-216).
How many 2x4 studs are required to frame a 20x20 room?
Framing a 20×20 room with 8ft wall height requires approximately 86 pieces of 2×4 studs at standard 16 inches On-Center (O.C.). This accounts for field studs, 3-stud corner assemblies, door/window king and jack trimmers, plus a 10% lumber cull factor per IRC Section R602.
How much joint compound and tape is needed to tape and mud a 20x20 room?
Taping and finishing a 20×20 ft room with 8 ft ceilings (walls and ceiling) to a standard Level 4 finish requires approximately 3 bucket(s) of 4.5-gallon ready-mix joint compound and 1 to 2 rolls (250 ft) of paper joint tape. You will also need approximately 1176 drywall screws (~4 lbs of 1-1/4" coarse-thread screws).
Should drywall be installed horizontally or vertically in a 20x20 room?
For 8ft or 9ft ceilings, horizontal installation is strongly recommended because it reduces continuous vertical butt joints by up to 25%, resulting in a significantly flatter wall plane and faster finishing. For commercial metal stud walls or high ceilings over 10ft, vertical installation may be required by local commercial fire codes.