Slate set out.

[2019]

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 .

 

[palaceray]

It depends on the pitch of the roof and if they are natural or man made slates.

 

[datarebal]

As above,head lap depends on roof pitch, head lap then governs gauge

 

[2019]

It's 31.5 degrees

 

[Vinty]

The formula for battening is length of slate minus headlap divided by 2.