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From: $85.23


TAMKO TWM-1 is a high quality, trowel grade, rubberized bitumen mastic that dries to a strong but pliable seal allowing for minor expansion and contraction.



TAMKO TWM-1 has multiple uses including, finishing the edge of seams, overlaps, patches and terminations of the properly sealed TAMKO Waterproofing Membrane. This product is also suitable for use in roof flashing applications and contains additives for use in wet and dry conditions.


Apply with a trowel or caulking gun. When applied with a caulking gun, the bead should be troweled to a thickness of 1/8" and a width of 1/2" to 1" and worked into all terminations.


  • Side laps: 900 lineal feet per gallon
  • End laps: 600 lineal feet per gallon


TWM-1 Mastic is not suitable for use as a waterproofing concrete/masonry sealer. When used to terminate the edges of the TAMKO Waterproofing Membrane, the use of TWM-1 Mastic is not a substitute for the seal of the waterproofing membrane itself.

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