KNOWLEDGE BASE & STANDARDS
Roofing Guides, References & Educational Resources
Authoritative, code-compliant roofing guides, measurement instructions, material comparisons, and national cost benchmarks written for homeowners, builders, and estimators.
Roof Pitch & Geometry Guides
Roof Pitch Explained
Complete guide to rise/run ratios (X/12), degrees, slope multipliers, and code material requirements.
Roof Pitch Chart
Full reference conversion chart mapping 1/12 to 24/12 pitch ratios to degrees, slope grade %, and multipliers.
How to Calculate Roof Pitch
3 safe and simple methods to measure roof pitch from the attic, ladder, or roof surface.
Average & Standard Roof Pitch
Learn typical residential roof pitch ranges (4/12 to 8/12) by home architectural style and climate.
Minimum Roof Pitch
Comprehensive guide to minimum slope requirements for shingles, metal, tile, and membrane.
Roof Pitch Multiplier
Learn how slope factors convert flat footprints into true sloped square footage.
Minimum Pitch for Metal Roof
Building code standards for standing seam, snap-lock, and corrugated metal roof slopes.
3/12 Roof Pitch Reference
14.04-degree slope specifications, 1.031 multiplier, and low-slope double underlayment rules.
4/12 Roof Pitch Reference
18.43-degree slope specifications, 1.054 multiplier, and shingle installation rules.
5/12 Roof Pitch Reference
22.62-degree slope specifications, 1.083 multiplier, and walkable residential framing rules.
6/12 Roof Pitch Reference
26.57-degree slope specifications, 1.118 multiplier, and standard residential framing rules.
7/12 Roof Pitch Reference
30.26-degree slope specifications, 1.158 multiplier, and transitional pitch framing rules.
8/12 Roof Pitch Reference
33.69-degree slope specifications, 1.202 multiplier, and steep slope OSHA safety rules.
12/12 Roof Pitch Reference
45.00-degree diagonal specifications, 1.414 multiplier, and steep slope safety rules.
Shed Roof Pitch Guide
Mono-pitch lean-to slope selection, rise tables for 8ft to 16ft spans, and material rules.
Single-Slope Shed Roof
How to build a single-slope shed roof: framing sequence, rafter lengths, and layout.
Roof Measurements & Estimating
How to Measure a Roof
Master measurement guide: calculate square footage for gables, hips, sheds, and flats.
Roofing Square Explained
What is a roofing square (100 sq ft), why contractors use it, and how to convert square feet to squares.
How to Calculate Roof Square Footage
Step-by-step formulas to calculate sloped square footage using footprint, overhangs, and multipliers.
How to Measure a Roof for Shingles
Safe ground and plan-based measurement techniques to calculate squares, waste, and bundles.
Asphalt Shingles, Installation & Maintenance
How to Shingle a Roof
Step-by-step installation guide: deck preparation, underlayment, starter strips, and ridge caps.
How to Replace Roof Shingles
Step-by-step repair guide: break seals, extract nails, and install replacement shingles safely.
How to Clean Roof Shingles
ARMA-approved methods to safely remove moss, black algae streaks, and lichen without granule damage.
Architectural Shingles Guide
Buying guide: compare top brands (GAF, Owens Corning, CertainTeed), costs, and wind ratings.
Architectural vs. 3-Tab Shingles
Compare architectural vs 3-tab shingles: pricing, 25-yr vs 15-yr lifespans, and 130 mph wind ratings.
Types of Roof Shingles
Compare 3-tab, architectural laminate, luxury designer, wood shake, and composite slate shingles.
Roof Shingle Colors
Popular color palettes, siding/brick coordination, and Cool Roof Rating Council energy ratings.
Roofing Nail Size for Shingles
Fastener standards (11-12 gauge, 1-1/4″ to 1-1/2″ lengths), deck penetration, and high-wind 6-nail patterns.
How Many Shingles in a Bundle?
Piece counts for 3-tab (26 pcs) vs. architectural (21 pcs) vs. luxury shingles (16 pcs).
Bundles of Shingles in a Square
Standard 3 bundles per square rules, coverage specifications, and luxury shingle exceptions.
Dimensional Shingles Guide
Features, multi-layer construction, 130 mph wind ratings, costs, and 3-tab comparison.
3-Tab Shingles Guide
Economy 3-tab strip shingles: costs, durability, pros, cons, and appropriate use cases.
Fiberglass Shingles Guide
Mat composition, Class A fire ratings, and comparison to legacy organic-mat shingles.
How Long Does a Shingle Roof Last?
Realistic lifespans by shingle tier, attic ventilation impact, and warranty distinctions.
Roofing Costs & Pricing Benchmarks
Roof Replacement Cost
2026 national cost benchmarks: prices by square foot, roofing square, and home size.
Roof Repair Cost
Typical prices for pipe boots, chimney flashing, valley leaks, shingle patches, and repair vs replace rules.
Roofing Cost per Square Foot
Unit economics $/sq ft for shingles ($3.50–$7.50), metal ($5–$17), and flat membrane ($6–$11).
Asphalt Shingle Roof Cost
Compare installed prices for 3-tab, dimensional, and luxury shingles by home size.
Flat Roof Replacement Cost
Installed cost ranges for TPO, EPDM, PVC, and modified bitumen flat membranes.
Roofing Cost per Square
Material vs. labor breakdown per 100 sq ft square across all major roofing systems.
Roofing Labor Cost per Square
Contractor labor rates, steep pitch surcharges, tear-off costs, and multi-story factors.
Metal Roofing Guides & Comparisons
Metal Roofing Pillar Guide
Comprehensive overview of metal roof types, costs, lifespans, and slope requirements.
Metal Roofing Panels
Broad panel pillar: standing seam, corrugated, R-panel, steel gauges (24 vs 26-ga), and coatings.
Corrugated Metal Roofing
Installed costs ($5-$9/sq ft), wave profiles, exposed fastener maintenance, and standing seam comparison.
Galvanized Metal Roofing
G90 zinc coating vs. Galvalume steel, corrosion mechanics, lifespans, and coastal limitations.
Aluminum Roofing
Superior marine corrosion resistance, 0.032″ vs 0.040″ thickness, installed costs, and steel comparison.
Metal Shingles
Stone-coated steel tiles/shakes: costs ($9-$15/sq ft), 50-year lifespans, and Class 4 hail ratings.
Metal Roof Panel Width
Nominal overall width vs net coverage (36″, 16″, 12″), overlap loss, and ordering formulas.
Metal Roof Cost
Installed pricing for standing seam vs. corrugated metal panels by square foot and home size.
Standing Seam Metal Roof Cost
Snap-lock vs. mechanical lock pricing, steel gauges (24-ga vs 26-ga), and 50-year ROI.
Metal Roof vs. Shingles
Definitive head-to-head comparison: upfront costs, 50-year lifecycle ROI, durability, and noise.
Can You Install Metal Over Shingles?
Building codes, synthetic slip-sheets, furring strips, and when tear-off is mandatory.
Metal Roofing Colors
Popular color palettes, Solar Reflectance Index (SRI) cool roof ratings, and PVDF paint systems.