How To Apply TPO Pre-Molded Pipe Seal

TPO Pre-Molded Pipe Seals are used to quickly waterproof round pipe penetrations for pipes ¾” to 8″ in diameter. This product provides substantial labor savings and a professional finished appearance.

  1. Size TPO Pipe Seal to pipe.
  2. Cut pipe seal to desired size; always cut above rib closest to pipe.
  3. Turn pipe seal upside down and mark pipe where Water Cut-Off Mastic will be applied.
  4. Apply ½” (1.27 cm) bead of Water Cut-Off Mastic at 10’ (3 m) per tube.
  5. When welding TPO flashing accessories, initial temperature setting for heat welder should be 6 (on a scale of 1-10).
  6. Heat the top edge of the pipe seal to ensure adequate flexibility.
  7. Pull pipe seal over pipe until base flange is in contact with membrane.
  8. Clean flange and deck membrane with Weathered Membrane Cleaner.
  9. Tack-weld flange in place.
  10. Weld flange and roll with hand roller.
  11. Install clamping ring below top rib.
  12. Trim excess.
  13. Check all welds with a seam probe once completely cooled (30 minutes).

Consult Spec Supplement T-01-11 for more information on temperature settings and equipment setup.