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.
Setting out slate roof tiles.
All other slates on the roof are installed with the face up in order to expose the beveled edges of the slate the face of the slate is the side that shows the beveled edge the back doesn t.
The next thing to do is to work out the spacing for the battens up the roof.
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 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.
Margin this is the visible or exposed area of a slate from the bottom or tail of one slate up to the point the slate above overlaps it.