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Build an interior wall

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Best checked by a general contractor. These are the general U.S. rules, and line numbers match a Sheet that uses them. A Sheet for a state or province can word a few lines differently (the frost depth, or Canada’s stair and insulation rules), and each wording needs its own sign-off. To see yours, set your state or province in Me → Settings → Where you work.
1
Non-load-bearing partition: single bottom plate + single top plate (IRC R602 allows a single top plate on non-bearing interior walls).
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2
Studs are cut to fit: height − 3″ of plates, bought as the next standard length (8′–16′) and cut several per board when short.
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3
Stud layout: one at each end plus one every 16″ on center.
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4
Each door: rough opening = door width + 2″ by 82½″ tall; 2 king + 2 jack studs. Header: a flat 2× when the top plate is within 24″ above it (IRC permits this in non-bearing walls for openings up to 8 ft); otherwise two 2×s on edge.
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5
Non-bearing 2×4 walls up to 14 ft tall (IRC Table R602.3(5)); fireblocking row when taller than 10 ft (IRC R302.11).
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6
+10% studs for warped or split boards.
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7
Drywall: net area (door openings removed) + 12% for cuts.
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8
Drywall screws: USG spacing — 16″ apart on walls with 16″ framing, 12″ with 24″ framing.
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9
Joint compound ≈ 10 gal per 1,000 sq ft and paper tape ≈ 370 ft per 1,000 sq ft (USG).
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10
Bottom plate on a concrete slab: pressure-treated (IRC decay protection).
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