Welcome to the Roof Online Knowledge Center

Find accurate & reliable information on just about any roofing topic.

Put together by professional roof consultants, Roof Online’s roofing knowledge center is a website dedicated to helping people find accurate and trustworthy information about roofs and roofing.

Our goal is to share our firsthand roofing knowledge and expertise, providing you with honest insights and true information so you don’t make mistakes or get taken advantage of when it comes to your roof.

The articles, information, pictures, and links to other websites that you will find on roofonline.com were produced, selected, reviewed, approved, and/or edited by qualified and credentialed roofing experts with roofing industry experience going back decades.

We also have a Roofing Forum where you can asked specific roofing questions, as well as a new Contractor Directory.

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.

Our roofing knowledge center 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.

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, or just search the website.

You can also see a full list of all pages on the website here.

Roof Systems and Primary Roofing Materials

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 components, pitch pans, and all the other parts of a roof system besides the primary roof covering.

Roofing Codes, Regulations, and Standards

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

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.