Roof Slate Headlap

If there is no headlap the roof will leak.

Roof slate headlap.

Headlap is what renders the roof water tight. If there is no headlap the roof will leak. Minimum recommended headlap mm unit 15 16 airfield approach business park flookburgh grange over sands cumbria la11 7ng england tel. 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.

Two layers 30 felt 19 overlap. First calculate your roof pitch and then determine the inches required for sidelap and headlap. A slate roof can last for a century and it is one of the major reasons that people choose this material over others. 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. Type 90 mineral surfaced underlayment. In slate roofing water migration is controlled primarily by the angle of the roof s slope. 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.

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. 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. 2 to less. The steeper the slope the less water migration there will be.

Most significant is the environment with the two main factors being exposure to wind and rain. Bs 5534 2014 is the code of practice for slating and tiling. The primary aspects to be considered are. 30 felt or comparable evaluation report required.

Slates must overlap 3 inches on the side which is called sidelap and must overlap on the top which is called headlap. Roof slope is key in determining underlayment type and installation. Headlap is what keeps the water from penetrating through the roof. Headlap is essen tially what renders the roof water tight.

Headlap is what keeps the water from penetrating through the roof. 3 12 to less than 4 12. Tile roof institute guidelines.