Pitched Slate Roof Construction Detail

Weight of slates kg area of roof m 2 slate coverage 1000 therefore the total weight.

Pitched slate roof construction detail.

One of the areas of a pitched roof most prone to leakage if not constructed properly is the valley. It is an area where water is directed towards rather than away from therefore correct detailing and construction is essential. The total weight of slates on roof can be found from the formula. This is more of a traditional manner in regards to cutting the timber while onsite and building up the roof by the use of rafters ridge boards joists and purlins among others.

The minimum pitching or sloping degree for the roof is decided by the minimum slope necessary for excluding the roof covering and drain rainwater to eaves or valley gutter. When slating with a shallow pitch a wide slate is highly recommended for maximum side lap or lateral lap side overlaps. Roof pitch 40 roof area m 2 150 length of roof slope m 9 5 the headlap can be found from table 1 by reference to slate size roof pitch and exposure 65 mm. What roof pitch do i need for what slate size.

Pitched roof detail the way that the tile is held on the roof differs slightly according to the material used. Generally speaking 20 degrees 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. This can be determined by the size of the timbers or the size of the roof. Pitched roofs are generally provided with a pitch of about 20 degrees to the horizontal for slates and 40 to 60 degrees for tiles.

Clay and concrete tiles have retaining nibs on the back of the tile which rest on the wooden lath slates which are essentially sheet materials have holes drilled in them and then nails are hammered though the holes into the wooden lath. The slate coverage per m2 can be found from table 2 23 9.