i am about to put batton on my roof for man made light wate slate and waas wondering the way i lay my batton out (spacing)and also how i start the first three as i have heard you have to over lap the first few layers to get them water tight thanks for your help :roll:
If you're using natural slate or imitation slate (not interlocking) the principal is the same in that you always have a minimum of 2 layers with 3 layers at overlaps. The spacing of the battens (gauge) is calculated by deducting the overlap (usually 75 to 100mm) from the length of the slate then dividing by 2. You will need an extra shorter course top & bottom to maintain the double thickness.
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