Instructions for Tri-Flex Underlayment

Prepare the Roof

• 1

  Sweep the roof clean.

• 2

  Remove anything sharp that could pierce the underlayment.

• 3

  Ensure that the roof is dry.

Install the Tri-flex Underlayment

• 4

  Apply vertical strips of the Tri-flex to valleys and hips with the printed side up.

• 5

  Staple the underlayment a minimum of 12 inches up all abutments (more in heavy snow conditions), printed side up.

• 6

  Roll the Tri-flex out along the bottom edge of the roof with the printed side up.

• 7

  Nail or staple the underlayment every 8 inches (on center) along the bottom edge and every 24 inches down the middle. In high wind conditions, secure the bottom edge every 4 inches instead.

• 8

  Overlap rows 4 inches and overlap end-to-end 6 inches.

• 9

  Trim around vents, skylights and other rooftop features carefully, and seal with a low-solvent, asbestos-free plastic roofing cement.

• 10

  Install a drip edge at the eaves under the underlayment and at rake over the underlayment.

• 11

  Apply the roof covering of choice as per manufacturer's instructions, just as you would with felt underlayment.