how to cut around a pipe penetration

When laying out the field sheets and a pipe or penetration is encountered, roll the folded membrane to the pipe. Be sure to maintain the proper alignment of the sheet with the roof edge, wall, and seams.

  • Make a straight cut from the pipe to the nearest edge of the field sheet.
  • Cut a hole to match the diameter of the pipe and roll the field sheet around the pipe.
  • Check the final position off the sheet. Fold the membrane back and begin the bonding procedure.
  • After the field sheet has been glued and broomed into place, apply a ClassicBond 150mm (6”) wide Cured Cover Strip over the entire cut in the field sheet from the pipe to the outside edge of the sheet

See the “Pipe Seal" section of this  further information on finishing this detail.