Enter perimeter, height, gables, and openings siding squares, housewrap rolls, and trim update live.
Gable ends
Opening deductions
Siding material
Siding squares to order
14
SQUARES
Bill of materials+10% waste
Siding Fiber cement (HardiePlank 8.25″)
100 sq ft/square · −312 sq ft openings
Net 1,272 sq ft net · Waste +10%
Housewrap 9×100 ft rolls
6″ overlaps · 900 sq ft/roll
Net 1,272 sq ft · Waste +15%
Starter strips 10 ft
Full perimeter course
Net 160 lin ft · Waste —
Corner posts 10 ft pcs
Stacked to wall height
Net 4 outside corners · Waste —
Cost projection
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Total · $4,544.00
14 squares
Net cladding area = (perimeter × height) + gables (½ × base × peak) − openings: 15 sq ft per window, 120 per garage door, 21 per entry door.
Enter perimeter, height, gables, and openings siding squares, housewrap rolls, and trim update live.
Siding squares = ceiling(net × (1 + waste%) ÷ 100). Use 10% waste, 15% for complex multi-gable layouts.
Housewrap = ceiling(net × 1.15 ÷ 900) 9×100-ft rolls with 6-in overlaps. Starter strips = ceiling(perimeter ÷ 10) in 10-ft pieces.
Squares = net area × (1+waste) ÷ 100
Squares = ceiling(net area × (1 + waste%) ÷ 100). A 160 ft perimeter with 9 ft walls, 2 gables, and ~312 sq ft of openings nets 1,272 sq ft — 14 squares at 10% waste.
Net cladding area = (perimeter × height) + gables (½ × base × peak) − openings: 15 sq ft per window, 120 per garage door, 21 per entry door.
Rolls = ceiling(net area × 1.15 ÷ 900) in 9×100-ft rolls, allowing for 6-in overlaps. A 1,272 sq ft net wall needs 2 rolls.
10% covers cuts and starter waste on simple rectangles. Bump to 15% for multi-gable or highly cut-up elevations with lots of windows.
Starter strips = ceiling(perimeter ÷ 10) in 10-ft pieces — one full course around the base of every wall.
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