Planning a roof replacement or new siding in Massachusetts? Use our thorough materials calculator to estimate shingles, underlayment, ice-and-water shield, siding squares, trim, gutters, soffits, and fascia—and learn how contractors calculate every layer.
Click the diagram to view all roof and exterior wall components full-size, then enter your home's approximate dimensions below.
Enter your building's ground footprint (plus overhangs). Pitch automatically adjusts flat footprint area to true sloped roof area.
Enter your home's total exterior wall perimeter and height, plus gable triangles and window/door openings.
Understanding the math helps you compare contractor proposals fairly and spot when essential Massachusetts weatherproofing layers are missing from a low-ball bid.
One roofing square = 100 sq ft (usually 3 bundles of architectural shingles). Multiply ground footprint by the pitch factor (e.g., ×1.118 for 6/12), add 10–20% cut waste, and include ice-and-water shield along eaves and valleys as required for New England freeze-thaw protection.
Multiply perimeter × wall height, add each gable triangle (0.5 × width × peak height), and subtract windows (~15 sq ft) and doors (~21 sq ft). Divide by 100 for siding squares, then add 10–15% for angled gable cuts and starter/corner waste.
Roofing and siding replacements are the ideal time to inspect rotted fascia boards, blocked soffit vents, and sagging gutters. Addressing them together saves scaffolding and labor costs while keeping water away from your foundation.
Our family-owned Massachusetts crew verifies every measurement on-site and gives you a clear, itemized proposal.
