Roof Slate Headlap

The primary aspects to be considered are.

Roof slate headlap. If there is no headlap the roof will leak. 3 12 to less than 4 12. Type 90 mineral surfaced underlayment. Headlap is essen tially what renders the roof water tight.

Most significant is the environment with the two main factors being exposure to wind and rain. When the head of a slate is overlapped by the slate two courses above it that s called headlap that s the critical overlap on a slate roof figure 2. Underlayments are installed on the roof deck prior to the installation of the slate roofing shingles. Two layers 30 felt 19 overlap.

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. Headlap is what keeps the water from penetrating through the roof. 30 felt or comparable evaluation report required. Lap ends 6 irc 4 2 horizontal.

When slating with a shallow pitch a wide slate is highly recommended for maximum side lap or lateral lap side overlaps. First calculate your roof pitch and then determine the inches required for sidelap and headlap. Roof slope is key in determining underlayment type and installation. In slate roofing water migration is controlled primarily by the angle of the roof s slope.

Slates must overlap 3 inches on the side which is called sidelap and must overlap on the top which is called headlap. A slate roof can last for a century and it is one of the major reasons that people choose this material over others. Headlap is what renders the roof water tight. 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.

Tile roof institute guidelines. 2 to less. Bs 5534 2014 is the code of practice for slating and tiling. 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.

When the head of a slate is overlapped by the slate two courses above it that s called headlap that s the critical overlap on a slate roof figure 2. If there is no headlap the roof will leak. Headlap is what keeps the water from penetrating through the roof.