Roofing Directory

Materials / Modified Bitumen

Modified Bitumen

asphaltic

Asphalt-based low-slope membrane reinforced and modified with polymers (SBS or APP), installed in rolls by torch, hot mop, cold adhesive, or self-adhered.

Category family
asphaltic
Typical lifespan
15–25 years
Typical wind resistance
FM-rated assemblies vary by attachment
Typical fire rating
Class A
Weight per square
100–150 lbs
Cost band
$$
Slope suitability
low
Typical warranty
10–20 years
Pros
  • multi-ply redundancy
  • good puncture and tear resistance
  • several installation methods
  • proven asphaltic chemistry
Cons
  • torch-applied methods carry fire risk
  • more labor-intensive than single-ply
  • seams require care

Manufacturers

CertainTeed

Named products

CertainTeed Flintlastic SACertainTeed

Related guides

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

Sources