Slate Roof Headlap

Furthermore you want to make sure the slates are manufactured with the nail holes in the right place.

Slate roof headlap.

The primary aspects to be considered are. Headlap as defined in the national slate association s slate roofs design and installation manual 2010 edition is the length in inches of the upper portion of a roofing slate that is covered by the butt of the slate two course above. Minimum headlap for fixing slates with nails or hooks the installation of a slate roof involves a number of aspects that must be considered in the design process. Headlap and exposure are related to each other and the starting point for determining both is roof slope.

Most significant is the environment with the two main factors being exposure to wind and rain. According to an identification guide on the slate roof central website some of the hardest heartiest types are purple slate non fading green slate and grayish black buckingham slate which can. For example a 10 inch by 20 inch slate requires 170 slates per square a square is 100 square feet of roof coverage when installed with a 3 inch headlap but requires 180 slates per square when installed with a 4 inch headlap. The part of the lapping system where there are three layers of slate.

Bs 5534 2014 is the code of practice for slating and tiling. When slating with a shallow pitch a wide slate is highly recommended for maximum side lap or lateral lap side overlaps. Generally speaking 20degrees is the lowest advisable pitch for a slate roof depending on the size of the slates and how much that the roof is exposed to moderate weather conditions.