Category: SSQ Natural Slate Fixing Sarking Board Trusses Maximum
Head Lap
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SSQ UK Ltd
Natural Slate 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 Head Lap for Fixing Slates with Nails or Hooks According to
BS 5534:2003
Moderate Exposure (Less than 56.5 l/m)
Severe Exposure (Less than 56.5l/m or over)
Coverage with Slates with Nail Fixing Method
Information associated with: SSQ - Natural Roofing & Waling Slate & Phyllite
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SSQ UK Ltd
301 Elveden Road
London
NW10 7SS
Tel: 020 8961 7725
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