Roof Side Lap

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

Roof side lap.

As defined in the glossary of the nsa manual it s the longitudinal joint between two slate shingles. The rolls can be easily cut to length. However sealant along side laps is often omitted. Why a side lap joint matters.

How a side lap joint works. Then situate the leading edge of the first panel along this line. The side lap also is referred to as a side joint vertical joint keyway bond line or rain course. 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.

On the eave side of the roof aim to overhang the panels by 1 to 1 5 inches. 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. 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. End lap refers to the amount of overlap in a direction following the roof slope. This side lap tape sealant comes in 150 ft. Flexible foam that is uv resistant and won t scratch the paint.

The use of sealant at end laps is a common practice unless the roof has a steep slope. Side lap sealant is a self adhering foam tape.