Vertical Laying

The laps on vertically laid roof underlay may face in either direction, as the direction of lay is usually dictated by construction sequencing or wind direction at the time of laying.

The bottom end of vertically laid roof underlay must overlap into the gutter by a maximum of 20 mm to prevent wicking. When an eaves flashing is used the underlay should terminate on the downslope of the flashing.

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4 - Clause Inserted
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Newly created clause.