Fabrics, Membranes and Reinforcements FAQs

1. With what type of materials are KARNAK Fabrics compatible?

The table below depicts the KARNAK fabrics and materials they are compatible with.

Recommended Usage – Bituminous Materials

KARNAK Fabric Asphalt
(Mastics & Coating)
(Hot Applied)
Coal Tar
(Mastics & Coating)
Coal Tar
(Hot Applied)
#3036 Polymat YES NO YES NO
#5540 Resat-Mat YES NO YES NO
#34 Cotton Fabric YES NO NO NO
#31 Fiberglass Membrane YES NO YES NO
#130 Glass Mat YES NO YES NO

Recommended Usage – Other Materials

KARNAK Fabric Acrylics
(Water Base)
Urethane Solvent Base
#3036 Polymat YES YES YES YES
#5540 Resat-Mat YES YES YES YES
#34 Cotton Fabric YES NO NO NO
#31 Fiberglass Membrane YES YES NO YES
#130 Glass Mat YES YES NO YES

2. What KARNAK Fabrics are the best to use?

What Fabric to use will depend on the products being used (See Usage Chart), and the intended application. Listed below is the make-up of each KARNAK Fabric.


KARNAK #3036 Polymat and #5540 Resat-mat (both polyester)

  • High tensile strength
  • Rot and Mildew resistance
  • Good resistance to solvents and chemicals
  • Good low temperature properties


KARNAK #31 Fiberglass Membrane and #130 Glass Mat (#130 not ASTM rated)

  • ASTM D-1668 Type III
  • Good flexibility without cracking
  • High tensile strength
  • Rot and Mildew resistant
  • Acid and Alkali resistant


KARNAK #34 Cotton Fabric

  • Asphalt saturated
  • Lightweight
  • Ease of workability
  • Flexibility


Fiberglass and Polyester fabrics are stronger