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Lumber for a 30x30 two-story house

outside walls

~240’ of 2x6 studs 16” o.c. ~= 180 studs ~= $900
~360’ of 2x6 plates ~= 45 studs ~= $225

inside walls

~120’ of 2x4 studs 16” o.c. ~= 90 studs ~= $350
~120’ of 2x4 plates ~= 15 studs ~= $60

platform framing

24x2 of 2 16’x2”x12” joists [96 16’x2”x12” joists][Note: I-beams would usually be used]
+
4 16’x2”x12” platform ends ~= $3000

subtotal ~$4500

plywood

roof x 30’x30’ ~= 1000 sq. ft. ~= $1,100

floors ~1800 sq. ft. $42 4’x8’x3/4” sheet ~= $2,400

sheathing ~1920 sq. ft. ~= $2,000 [Note: Oriented Strand Board would normally be used]

truss wood

16(1+30/2 24” o.c.) x 70’ ~= 140 2x4 studs ~= $560

wood for house ~= $11,000 total