Glass Fab Fiberglass Mesh

(2 reviews) Write a Review
Price: $10.50
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Glass Fab is a fiberglass resin coated glass fiber scrim that is designed for use with tar or asphalt based waterproofing compounds and for use with surfacing mastic used on insulated indoor, outdoor and underground piping, tanks and other mechanical equipment. It has high tensile strength and is dimensionally stable. It will not burn, rot, mildew, or decay. Fiberglass mesh is flexible and resistant to acid and alkali.

Glass Fab comes in two colors: white and black and two sizes 3" x 150' and 36" x 150'.


COLOR: White or Black
WIDTH: 3" or 36"
LENGTH: 150 feet
GRID: 10 x 10

3" Wide Rolls have an adhesive backing to allow a tight spiral around piping without telescoping or loosening.


  • Put a base coat of mastic (trowel/brush) on a section of insulation
  • Cut a piece of Glass Fab long enough to allow an overlap
  • Wrap the Glass Fab around the pipe/vessel making sure the mesh is flat without bubbling or wrinkling
  • Apply mastic around the overlaps to provide adhesion
  • Apply a top coating to fully encapsulate the Glass Fab


  • A base coat of mastic is optional as the 3" wide rolls are self adhesive
  • Spiral the Glass Fab around the fitting
  • Apply a mastic until the Glass Fab is fully encapsulated
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  • 2
    needed pre-glue glassfab. works better

    Posted by Miguel E. on 7th Sep 2020

    missing adhesive

    *Miguel, the 36 inch wide rolls do not have adhesive, only the 3 inch wide rolls do. Our apologies for any confusion ~ BIP

  • 4
    Works as described

    Posted by Charles E. on 26th Oct 2019

    Purchased the 36" width for sealing commercial duct work.
    Staple to insulation board and apply mastic.

    Though it would be nice if it had an adhesive backing like drywall mesh would make installation easier and eliminate the need for a case of staples.

    *Charles, I know its too late for your project but this is for anyone else looking for this product. Use a light layer of mastic first, then stick the mesh to the first layer, and then coat over it heavily with the 2nd layer. If you do that, adhesive isn't necessary. Also the 3" wide rolls come with adhesive. ~BIP