Welcome to Roof Online!

Find reliable information on just about any roofing topic.

Put together by professional roof consultants, Roof Online is a website dedicated to providing (or locating) good, accurate, and thorough information about every kind of roof and all aspects of roofing.

The content of this site was produced by, selected, or vetted by qualified and credentialed roofing experts with roofing industry experience going back decades.

Our site is aimed mainly at property managers, homeowners, and commercial building owners, but we do put a healthy amount of effort into making it very useful to roofing contractors and our fellow roof consultants as well.

Roof Online is growing constantly, so please bear with us as we add information. And while you’re here, why not check out the Top Ten Roof Songs of all time? Or even the Ten Best Rooftop Movie Scenes, if you’ve got the time.

Popular Pages

EPDM Roofing: Facts and Guidelines

Life Expectancy of Roofing Materials

Modified Bitumen: Facts and Guidelines

Roof Pitch to Degrees  Degrees to Roof Pitch

Roof Scuppers: Facts and Guidelines

Weight of Dimensional Lumber

Weight of Plywood and OSB

All Roofing Topics

What are you looking for? Click on a category below to see our topic pages about the subject you’re interested in.

Primary Roofing Materials and Roof Systems

Pages that cover asphalt shingles, clay and concrete tile, metal roofing, EPDM, TPO, PVC, and much more!

Roof System Components and Accessories

Pages that cover insulation, coatings, drainage, pitch pans, and all the other parts of a roof system besides the primary roof covering.

Related Building Components

Pages that cover sheathing, chimneys, HVAC units, and other parts of the building that have an effect on the roof.

Roofing Codes, Regulations and Standards

Find information on building codes, energy codes, and roofing industry standards.

Roof Issues and Problems

Pages that address common roof problems. Wind issues, snow issues, asbestos, and other kinds of defects and damage.

Roof Management and Documentation

Planning, roof repairs and replacement, roof maintenance, roof cleaning…and all the paperwork that comes with taking care of a roof.

Roof Inspection, Surveying, and Measurement

Pages that cover inspecting roofs, roof surveys, roof condition reports. How to use satellite imagery (Google Earth) to find and measure roofs.

Roofing Contractor Information

Here’s where you can get started doing your research on roofing contractors.

Roofing Manufacturer Directory

A huge directory of companies that manufacture roofing products and related materials, as well as things like skylights and solar power products.

Roof Slope Tables, Calculations, and Formulas

Everything to do with roof pitch. Slope factors, hip and valley info, conversion charts.

Weights and Measures

Comprehensive tables showing the weights of various materials and other important metrics like thickness, thermal expansion, and R-value.

Roofing Reference and Education

A directory of all the roofing magazines you can find online, our list of recommended roofing reference books, historic roofing resources, roofing education providers.

General Roofing Categories

Pages on things like cool roofs, green roofs, flat roofs, etc. that aren’t specific to one kind of roofing material.