Building Products for the Professional

TWM-1 Mastic

TAMKO® TWM-1 is a high-quality, trowel-grade, rubberized bitumen mastic with multiple uses, including finishing the edge of seams, overlaps, patches and terminations of the properly sealed TAMKO waterproofing membrane. Also suitable for use in roof flashing applications.

TWM-1 Mastic

Limited Warranty
  • 5-year Product Limited Warranty
  • Multiple uses including finishing the edge of seams, overlaps, patches, and terminations of properly sealed sheet waterproofing membranes
  • Dries to a strong but pliable seal allowing for minor expansion and contraction
  • Contains additives for use in wet and dry conditions
  • Apply with a trowel or caulking gun
  • Available in 3 gallon pails
  • Also available in handy 29-ounce and 10.5 ounce tubes

TWM-1 Mastic

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