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Roofing

Roofing calculators for area, pitch, shingle materials, ventilation, snow load, and underlayment

Calculators & Instant Answers

Interactive tools and pre-calculated results for common scenarios

Calculate roof surface area accounting for pitch and determine total square footage

Estimate asphalt shingles, underlayment, and accessories needed for roofing projects

Calculate required attic ventilation area based on International Residential Code

Determine design snow loads for roofs based on location and roof characteristics

Calculate roofing underlayment material requirements including felt and synthetic products