May 2007

Tile enters the environmental arena | Technical Elements

Technical Elements not ratednot ratednot ratednot ratednot rated

Tile enters the environmental arena

by Tom Bollnow
Be the first to comment

Long considered one of the more durable and sustainable steep-slope roof covering materials, clay and concrete roof tile products have been becoming more energy-efficient and environmentally friendly. The development of lightweight and cool-colored tiles has resulted in increased availability of tile roof systems on existing structures and the use of tile roof systems to achieve energy-saving goals.

Lightweight tile

To be classified as lightweight, tile roof covering material must weigh less than 6 pounds per square foot (psf) at oven-dry weight. A key factor in the design and performance of lightweight tile roof systems is a tile's water absorption property. Water absorption can increase a tile system's weight after a rainfall and possibly affect a building's structural integrity. For example, a tile product that weighs 5 psf at oven-dry weight and has a 10 percent water absorption rate by weight will weigh 6.05 psf when wet.

A lightweight tile load of less than 6 psf allows tile to be used as a roof system replacement on existing structures often without requiring a structural load analysis per local building departments. However, lightweight tile may sacrifice strength and low water absorption properties to achieve the required light oven-dry weight; therefore, the use of lightweight tile is not recommended for all geographical areas. Locations where lightweight tiles generally are not recommended include regions of freeze-thaw cycling, moderate to heavy...

To read the article in its entirety, please log in or register (registration is free).

Log in or register for FREE access to this article and other Professional Roofing online content.

Not a user?

Register now for free access
  • Full access to every article
  • Online Web exclusive information
  • Photo gallery
  • Breaking news
  • Online classified ads

Already a user?

Log in now

User name:



Login help
Click here to have your user name and password emailed to you.

Comments (0) Login to post a comment or rating
There are no comments posted.