How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manufactured and modular homes
What is the average life expectancy of a built-up roof?
Friday, June 5, 2020
How long does a built-up roof last?
You can expect a 4-ply built-up roof to last from 17 to 25 years, with an average of 20 years. Built-up roofs have between 3 and 5 layers of roofing paper, called “plies,” mopped with hot asphalt between each ply. More plies means a longer life, and a rule-of-thumb is 5 years for each ply.
Here’s a bar graph comparing built-up roof life expectancy of other types of roof coverings.
Go to our blog post What is the average lifespan of the parts of a house? for rating of other house components. To understand the basis, potential use, and limitations of lifespan ratings, see How accurate are the average life expectancy ratings of home components? Are they actually useful?
• • • • • • • • • • • • • • • • • • • • •
Field Guide for Home Inspectors, a quick reference for finding the age of 154 brands of HVAC systems, water heaters, and electrical panels, plus 210 code standards for site-built and manufactured homes, and the life expectancy rating of 195 home components. Available at amazon.com for $19.95.
• • • • • • • • • • • • • • • • • • • • • •
Here’s links to a collection of some of our other blog posts about “FLAT ROOFS (LOW SLOPE)":
NOTE: These life expectancies are based on data provided by InterNACHI, NAHB, FannieMae, and our own professional experience. Because of the numerous variables that can affect a lifespan, they should be used as rough guidelines only, and not relied upon as a warranty or guarantee of future performance.
of Blog Posts
Top 5 results given instantly.
Click on magnifying glass
for all search results.
Buying a home in North/Central Florida? for a team inspection by two FL-licensed contractors and inspectors. Over 8,500 inspections completed in 20+ years. In a hurry? We will get it done for you.