Roof Slate Headlap

Headlap is what keeps the water from penetrating through the roof.

Roof slate headlap.

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. 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. Underlayments are installed on the roof deck prior to the installation of the slate roofing shingles. Type 90 mineral surfaced underlayment.

30 felt or comparable evaluation report required. Most significant is the environment with the two main factors being exposure to wind and rain. First calculate your roof pitch and then determine the inches required for sidelap and headlap. 3 12 to less than 4 12.

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. The steeper the slope the less water migration there will be. Roof slope is key in determining underlayment type and installation. 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. The primary aspects to be considered are. Lap ends 6 irc 4 2 horizontal. Headlap is essen tially 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. 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. Tile roof institute guidelines. Headlap is what renders the roof water tight.

Two layers 30 felt 19 overlap. Headlap is what keeps the water from penetrating through the roof. 2 to less. In slate roofing water migration is controlled primarily by the angle of the roof s slope.

Bs 5534 2014 is the code of practice for slating and tiling. A slate roof can last for a century and it is one of the major reasons that people choose this material over others. If there is no headlap the roof will leak.