Description:

Built-up Roofing consists of alternate layers of roofing felt and individual moppings of “Hot Asphalt.”  Built-Up Roofing may include either 3 or 4 piles of roofing felt.  Top surfacing can consist of gravel, smooth of granular surfaces similar to the look of a roofing shingle.

Uses:

A Built-up Roof is the most common type of roof for flat applications.  They can be installed over insulation, on metal roof decks, or directly on plywood roof decks with or without insulation.

Life Span:

A Four-Ply Built-Up roof will last 9 to 11 years and a Three-Ply normally lasts 6 to 8 years.  If the roofs are professionally maintained, they should last another 4 to 5 years.

Caution:

• Asphalt is the waterproofing.  Be sure to install enough asphalt.
• Although over heating the asphalt during installation aids the crews to install a job faster, it lowers the quality of the roof.  Use proper techniques to insure the best installation and quality of your roof.

Limitations:

• It’s recommended that the old roof be removed before re-roofing.
• Proper flashing details are critical to ensure a roof that will last.