Should you need to re hole slates firstly we need to know the gauge calculate this by using the maths below.
Slate roof batten gauge for slates.
The updated bs 5334 code of practice for slating and tiling specifies a number of batten sizes based upon the span of the rafters and the product being used.
The most commonly used slate size in southern england is 500x250mm and 400x250mm in scotland and the north of england.
Tile batten gauge for slate.
Roofing battens are nailed into the rafters or roof joists or trusses and provide support for the roof tiles or slates.
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For a 500mm long slate with a 100mm headlap the gauge is 500 100 400 2 200 so we know the gauge is 200mm.
Batten gauge length of slate headlap 2.
Holing gauge mm battening gauge mm m batten per m2.
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Please enter the dimensions in the white fields below and click calculate to show the results.
Holing gauge for holing slates.
Sizeof typical gaugeof battens no of weightof slate laps battens perm2slates slatesaslaid mm mm mm perm2 kg m2 600x300 110 245 4 08 13 6 20 9 600x300 100 250 4 00 13 4 20 4 500x250 100 200 5 00 19 6 20 9.
Total linear run of tile batten in metres.
Slate length mm battening gauge mm m batten per m2.
Holing gauge batten gauge headlap 10mm.
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Battens should be set out horizontally across the roof at a gauge calculated from the formula.
The slate or tile manufacturer or supplier will specify the size of battens to be used typically this would be 40 x 20mm 1 5 x inch but where the horizontal gaps between rafters is large or the slates tiles are heavy then bigger battens may be needed.
Gauge length of slate lap 2 battens should be nailed at maximum 600 mm.
Recommended timber batten sizes for natural slate roofs are 50 25 mm up to 600 mm rafter spans according to bs 5534.
Height of slate minus desired headlap divided by two gauge i e.
This calculator will estimate the following number of slates required per square metre.
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The holing gauge can be calculated as.
Roofing slate bsen12326 1 2004 data.