Headlap Slate Roof

Most significant is the environment with the two main factors being exposure to wind and rain.

Headlap slate roof. These are all words that should send a chill up the spine of any good slater. Notes from bs 5534 2014. 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. Headlap exposure and offset.

If your property s roof is in the green moderate part of the uk but you know of prevailing bad winds or weather you may wish to use the other chart instead. Headlap is a fundamental necessity on slate roofs that are laid with a shingle style the most common installation method in the. There are few details on a slate roof installation that if done wrong will cause the entire roof to be condemned and have to be removed and done all over again. Once you have chosen pitch and headlap you ll be able to determine the number of slates you ll need per m 2 using our coverage tables.

Most stock slates will be pre holed at 75 90 or 100mm allowing you the versatility of different pitches commonly 25 degrees in moderate exposure zones and 30 degrees in severe. The most commonly used slate size in southern england is 500x250mm and 400x250mm in scotland and the north of england. Minimum slate headlap moderate weather this table of slate overlaps and roof angles shows common sizes of roofing slate and the recommended slope for the corresponding slate size. 4 traditional roofing 2007 joseph jenkins inc.

If your roof is shallower between 4 12 and 8 12 the slates should have a headlap of at least four inches. Headlap and exposure are related to each other and the starting point for determining both is roof slope. Laying slate with appropriate headlap and offset helps to accommodate wind driven rain and the lateral movement of water below the slate shingles to prevent infiltration through the nail holes and side joints. Minimum recommended headlap mm unit 15 16 airfield approach business park flookburgh grange over sands cumbria la11 7ng england tel.

The minimum roof pitch for natural slates is 20 degrees bs 5534 2014 page 45 depending on size of slate see table above bs 5534 2014 page 45 table 9.