Roof Side Lap

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.

Roof side lap.

The side lap also is referred to as a side joint vertical joint keyway bond line or rain course. Flexible foam that is uv resistant and won t scratch the paint. Why a side lap joint matters. The use of sealant at end laps is a common practice unless the roof has a steep slope.

Beginning at the roof edge measure one panel width and chalk a line from the ridge to the eave. How a side lap joint works. On the eave side of the roof aim to overhang the panels by 1 to 1 5 inches. However sealant along side laps is often omitted.

Then situate the leading edge of the first panel along this line. The rolls can be easily cut to length. End lap refers to the amount of overlap in a direction following the roof slope. Side lap refers to the overlap in a sideways or horizontal direction.

The absence of side lap sealant makes some roofs vulnerable to water intrusion which can have expensive conse quences. As defined in the glossary of the nsa manual it s the longitudinal joint between two slate shingles. Roofing lap the amount by which roofing tiles slates shingles flashings etc overlap each other to achieve waterproofing. Make sure the panel is square to the roof line.

Side lap sealant is a self adhering foam tape. Rolls and installs in the side lap of the roof and wall panels.