Foster 42-24 Mast-A-Fab Reinforcing Membrane | GLT Products

Foster 42-24 Mast-A-Fab Reinforcing Membrane

Foster® 42-24™ Mast-A-Fab® Reinforcing Membrane has a synthetic fiber composition that provides for significantly greater elongation, recovery, and freedom from stress breakage. Glass cloth has virtually no elongation and breaks sharply under stress.

MAST-A-FAB has a leno weave that gives stability to the fabric, eliminating the thread movement and distortion inherent to plain weave cloths. It will not detectably affect the flame spread and smoke developed ratings of the selected mastic or coating.

MAST-A-FAB is easy to bond to and wets out readily compared to glass cloth. This minimizes the possibility of disbonding of tack and finish coats, a common problem with glass membrane reinforcement.


  • Because it weighs only 0.9 ounces per square yard, about half the weight of glass cloth, Mast-a-Fab is easy to work with. 
  • A full roll can easily be "one handed" for a faster, trouble free installation.
  • No asbestos, lead, mercury, or mercury compounds. 

 For the most up-to-date SDS sheet, visit the manufacturer’s website: Foster Products

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