Roof Slate Headlap

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.

Roof slate headlap.

Headlap is what keeps the water from penetrating through the roof. Headlap is what renders the roof water tight. 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. First calculate your roof pitch and then determine the inches required for sidelap and headlap.

Headlap is what keeps the water from penetrating through the roof. The primary aspects to be considered are. Type 90 mineral surfaced underlayment. Slates must overlap 3 inches on the side which is called sidelap and must overlap on the top which is called headlap.

In slate roofing water migration is controlled primarily by the angle of the roof s slope. If there is no headlap the roof will leak. Bs 5534 2014 is the code of practice for slating and tiling. Tile roof institute guidelines.

Roof slope is key in determining underlayment type and installation. 30 felt or comparable evaluation report required. Minimum recommended headlap mm unit 15 16 airfield approach business park flookburgh grange over sands cumbria la11 7ng england tel. 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. A slate roof can last for a century and it is one of the major reasons that people choose this material over others. Most significant is the environment with the two main factors being exposure to wind and rain. Two layers 30 felt 19 overlap.

2 to less. Lap ends 6 irc 4 2 horizontal. 3 12 to less than 4 12. Headlap is essen tially what renders the roof water tight.

When slating with a shallow pitch a wide slate is highly recommended for maximum side lap or lateral lap side overlaps. It describes not only the means of installing slates nailing or hook fixings but also the headlaps or lap required to ensure that the roof remains watertight even at pitches as low as 20 degrees. If there is no headlap the roof will leak.