Installation Guide for Tower™ Roofing

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6. Underlayment

A peel and stick polyethylene film surfaced ice and water protector material must be installed in all valleys (extending 18” (45 cm) on either side of the lowest point of the valley) eaves (extend a minimum of 18” (45 cm) past the inside of the outside wall), open gable ends (18” (45 cm) into the field of the roof), hips and ridges (extend 18” (45 cm)on either side of the hip or ridge), around skylights, pipes and any other protruding objects (18” (45 cm) around the perimeter of any protrusion) in the roof deck where the penetration of water and/or ice is possible. Ensure that the ice and water ‘spills onto’ the underlayment lower on the roof.

The remaining portion of the roof is to be covered with a polypropylene synthetic underlayment. Always install underlayment horizontally, starting at the bottom (eaves) of the roof working your way to the top (ridge), ensuring that it is overlapped 6” (15 cm) downward to shed any water down the roof, and overlapping the Ice and Water 3” (7.5 cm) at the edges of the roof such that the synthetic underlayment edge is covered by the 18” (45 cm) wide piece of Ice and Water. At the outside edges of the roof, the Ice and Water underlayment should extend 1” (2.5 cm )over the edge of the roof so it can be folded over the edge of the deck to ensure the edge of the deck is protected. This will typically be covered by the drip edge (eave starter)./p>

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