Roof Side Lap

Roofing lap the amount by which roofing tiles slates shingles flashings etc overlap each other to achieve waterproofing.

Roof side lap.

Adhesive on one side allows the tape to remain in place while installing it. However sealant along side laps is often omitted. The rolls can be easily cut to length. Side lap sealant is a self adhering foam tape.

When two pieces of metal deck with the same profile are adjacent a side lap joint can be used to fasten the two sheets together by overlapping a portion of each sheet by using a side lap fastener. As defined in the glossary of the nsa manual it s the longitudinal joint between two slate shingles. Side lap refers to the overlap in a sideways or horizontal direction. Beginning at the roof edge measure one panel width and chalk a line from the ridge to the eave.

End lap refers to the amount of overlap in a direction following the roof slope. Then situate the leading edge of the first panel along this line. Make sure the panel is square to the roof line. Flexible foam that is uv resistant and won t scratch the paint.

How a side lap joint works. The absence of side lap sealant makes some roofs vulnerable to water intrusion which can have expensive conse quences. This side lap tape sealant comes in 150 ft. Why a side lap joint matters.

Whenever one is installing a slate roof it is absolutely imperative the side lap is a minimum of 3 inches. Rolls and installs in the side lap of the roof and wall panels.