Roof Side Lap
The side lap also is referred to as a side joint vertical joint keyway bond line or rain course.
Roof side lap. However sealant along side laps is often omitted. Beginning at the roof edge measure one panel width and chalk a line from the ridge to the eave. Make sure the panel is square to the roof line. As defined in the glossary of the nsa manual it s the longitudinal joint between two slate shingles.
On the eave side of the roof aim to overhang the panels by 1 to 1 5 inches. Rolls and installs in the side lap of the roof and wall panels. Then situate the leading edge of the first panel along this line. The rolls can be easily cut to length.
Side lap sealant is a self adhering foam tape. Why a side lap joint matters. Flexible foam that is uv resistant and won t scratch the paint. This side lap tape sealant comes in 150 ft.
The use of sealant at end laps is a common practice unless the roof has a steep slope. Adhesive on one side allows the tape to remain in place while installing it. End lap refers to the amount of overlap in a direction following the roof slope. How a side lap joint works.
Roofing lap the amount by which roofing tiles slates shingles flashings etc overlap each other to achieve waterproofing. Whenever one is installing a slate roof it is absolutely imperative the side lap is a minimum of 3 inches.