Roofing Directory

Materials / Built-Up Roof (BUR)

Built-Up Roof (BUR)

BUR

A traditional low-slope system of alternating layers (plies) of bitumen and reinforcing felts, typically topped with gravel or a cap sheet. The original redundant membrane roof.

Category family
BUR
Typical lifespan
15–30 years
Typical wind resistance
gravel-surfaced assemblies perform well; varies by build
Typical fire rating
Class A
Weight per square
250–700 lbs
Cost band
$$
Slope suitability
low
Typical warranty
10–20 years
Pros
  • multiple redundant plies
  • excellent waterproofing track record
  • gravel surface protects from UV and adds fire resistance
Cons
  • heavy
  • labor-intensive install
  • hot asphalt fumes and hazards
  • difficult leak diagnosis under gravel

Related guides

Asphalt vs. Metal vs. Tile Wind & Fire Ratings New Roof Cost

Sources