Roofing Reference Materials
Charts, tables, code requirements, and technical specifications every roofer and homeowner needs. Bookmark these pages for quick access during your project.
Charts & Tables
Roof Pitch Multiplier Chart
Complete reference table of pitch multipliers from flat (0/12) to extreme (24/12). Use these multipliers to convert footprint area to actual roof area based on your pitch.
View referenceShingle Coverage Chart by Brand
How many square feet does a bundle cover? Reference chart for GAF, Owens Corning, CertainTeed, Tamko, and IKO shingles with bundles per square for each product line.
View referenceRoofing Square Conversion Tables
Quick conversion between square feet, roofing squares, bundles, and rolls. Includes underlayment, ice & water shield, and starter strip quantities.
View referenceRoofing Material Weight Chart
Dead load weights for all roofing materials in pounds per square foot and per roofing square. Essential for structural load calculations.
View referenceInstallation
Roofing Nail Patterns & Spacing Guide
Nail placement diagrams for shingles, underlayment, and flashing. Includes standard and high-wind zone patterns per manufacturer specifications.
View referenceUnderlayment Selection Guide
Felt vs. synthetic underlayment comparison. Coverage rates, overlap requirements, and when ice and water shield is required by code.
View referenceFlashing Types & Applications
Step flashing, counter flashing, valley flashing, drip edge, and pipe boot specifications. Material options, dimensions, and installation best practices.
View referenceBuilding Codes
Wind Zone Map & Requirements
US wind zone classifications with required shingle ratings, nail patterns, and supplementary fastening requirements for each zone.
View referenceSnow Load Requirements by State
Ground snow load values (psf) by state and region. Structural requirements for roof framing, ice dam protection zones, and minimum slope requirements.
View referenceVentilation Requirements (NFA Calculator Reference)
Net Free Area requirements by attic size. 1/150 and 1/300 rule explained, balanced intake/exhaust ratios, and vent product NFA ratings.
View referenceEducation
Roofing Terminology Glossary
Comprehensive A-Z glossary of roofing terms. From "apron flashing" to "zinc strip," every term a homeowner or contractor needs to know.
View referenceCommon Roof Shapes & Styles
Visual guide to gable, hip, mansard, gambrel, flat, shed, butterfly, and other roof styles. Characteristics, cost implications, and material compatibility.
View referenceNeed to Run the Numbers?
Use our free calculators alongside these reference materials to plan your roofing project with confidence.
Browse All Calculators