The slate or tile manufacturer or supplier will specify the spacing of the battens up the roof for the particular type of covering this spacing is referred to as the gauge the gauge may depend upon the pitch of the roof and the amount of exposure.
Setting out slate roof tiles.
Each plain tile is 165mm wide and can have up to 3mm gap between them.
Having set out and nailed all the battens the setting out of tiles on each batten should be considered.
The reason the starter course is laid face down is because the drip edge of the starter slate then merges flush with the drip edge of the first.
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The next thing to do is to work out the spacing for the battens up the roof.
The first course of tiles should be set out to equalise all the gaps between the tiles start and finish at corner or abutments and hopefully line up with the sides of.