Setting Out A Roof For Slating

Installation when laying out a roof in preparation for slating it chalk lines across the entire roof area marking the top edge of every row of slate.

Setting out a roof for slating.

Locate the centre point of the eaves and centre the first under eaves slate. The gutter will be formed in cast aluminium. When slating with a shallow pitch a wide slate is highly recommended for maximum side lap or lateral lap side overlaps. Lay the first full slate over the top of this under eaves slate and cut the slates on both verges to the same width.

Cut the second under eaves course from the same slate as the first course. You should have all of these tools plus a nail belt chalk line utility knife and a collection of ladders. Measure between the top of the top batten and the top of. This is also the lathing gauge for that course.

Alternatively the fascia board can be raised slightly in order to raise the bottom of the starter course. Start by establishing the position for the lowest batten for the slates tiles on the roof allow for the overhang of. Traditionally this has been done by nailing a cant or shim strip made from wood under the bottom edge of the starter course usually the same wood that is used to create the roof deck see photos below. Generally speaking 20degrees is the lowest advisable pitch for a slate roof depending on the size of the slates and how much that the roof is exposed to moderate weather conditions.

Work towards both verges with the remaining under eaves slates. For example a 20 inch slate with a 3 inches headlap would have an 8 5 inches exposure 20 inches 3 inches 2 81 2 inches. The width of the first course slates was 12 a very heavy thick slate to cut. The building will have an exposed timber eaves.

Then determine the position of the highest batten at the top typically the top of the uppermost row of slates tiles.