Roof Slate Headlap

Headlap is essen tially what renders the roof water tight.

Roof slate headlap.

Lap ends 6 irc 4 2 horizontal. Minimum recommended headlap mm unit 15 16 airfield approach business park flookburgh grange over sands cumbria la11 7ng england tel. Two layers 30 felt 19 overlap. Tile roof institute guidelines.

In slate roofing water migration is controlled primarily by the angle of the roof s slope. 3 12 to less than 4 12. Bs 5534 2014 is the code of practice for slating and tiling. 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. The steeper the slope the less water migration there will be. Headlap is what renders the roof water tight. 30 felt or comparable evaluation report required.

2 to less. Roof slope is key in determining underlayment type and installation. Type 90 mineral surfaced underlayment. 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.

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. 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. 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. 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. First calculate your roof pitch and then determine the inches required for sidelap and headlap. Slates must overlap 3 inches on the side which is called sidelap and must overlap on the top which is called headlap. The primary aspects to be considered are.

Underlayments are installed on the roof deck prior to the installation of the slate roofing shingles. If there is no headlap the roof will leak. Headlap is what keeps the water from penetrating through the roof.