Why a 6/12 pitch adds 12% area — and exactly how many bundles, panels and rolls your roof needs.
Roofing squares, shingle bundles, felt and nails from the house footprint and pitch.
Pitch ↔ angle ↔ rafter length from span and rise.
Rib panels, total coverage and screws for a metal roof from eave length and slope length.
Siding squares and cartons for exterior walls, netting out doors, windows and gables.
Depth and bags of blown-in cellulose to reach a target R-value over what's already there.
4×8 sheets for subfloor, sheathing or roof decking from area, with the standard 10% cut waste.
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