SSQ

Natural Slate Fixing for Roofing - Technical Information

Fixing Random Roofing Slates with Diminishing Courses

Fixing random slates starts with sorting and grading the slates being used; first by overall length and then, within each length, by thickness. The number of slates of each length will determine how many courses of each can be laid using the same overlap and, once known, allows the roof to be marked out.

On Sarking Board:

The easiest method is to mark the head or tail position of each course, either after the previous course has been laid or using ‘marker’ slates laid at the verges. A line can be marked either directly on the felt underlay to show the head of the slates in the next course or, alternatively, on the slates of the previous course to show the position of the tail.

On Trusses:

The spacing between the battens needed for each length of slate has to be calculated. Note! As the slates get shorter, the gap between the battens decreases. The batten supporting the head of the first course of shorter slates must be fixed at the spacing for the new length minus the difference in lengths

Minimum Headlap for Fixing Slates with Nails or Hooks According to BS 5534:2003

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