Slate set out.

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Say the rafter length is 5m, the board behind the fascia board is 3/4 ply with fiscia is normal thickness. What would the headlap and batten guage I need. Slates 600x300mm .
 
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It depends on the pitch of the roof and if they are natural or man made slates.
 
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The formula for battening is length of slate minus headlap divided by 2.
 
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