Slate Roof Batten Spacing

Ensure the first full course of slates oversails the gutter by 50 55mm.

Slate roof batten spacing.

With the roofing felt fitted see fixing roofing felt the next job is to fix the roofing battens. Battens should be set out horizontally across the roof at a gauge calculated from the formula. The batten gauge can also be calculated using the formula. Gauge length of slate lap 2 battens should be nailed at maximum 600 mm.

The most commonly used slate size in southern england is 500x250mm and 400x250mm in scotland and the north of england. This layout gives a double lap covering i e. The updated bs 5334 code of practice for slating and tiling specifies a number of batten sizes based upon the span of the rafters and the product being used. Slates are laid on the battens in a brick bond pattern i e.

For example 25 x 50mm battens are required for single lap modern roof tiles laid on rafters with a 600mm span. Nail the first full course of slates to the second batten so that the tail rivet passes between the two second under eaves slates and protrudes through the hole in the tail of the full slate. This is normally done by adding another batten which reduces batten gauge and increases headlap or by stretching which is increasing batten gauge slightly. Set out the first second and all the rest of slates on a pitched roof.

Slate length mm battening gauge mm m batten per m2. Holing gauge batten gauge headlap 10mm. Batten gauge length of slate headlap 2. Recommended timber batten sizes for natural slate roofs are 50 25 mm up to 600 mm rafter spans according to bs 5534.

The top part of each slate is covered by two slates the centre of the slate of the next row and the lower part of the slate above that. Holing gauge mm battening gauge mm m batten per m2. With the joints between them aligned with the centre of the slates above and below and with about 3mm between the sides. The holing gauge can be calculated as.

The tails of all three courses of slate should align and overhang the gutter. It also allows you to determine the holing gauge distance from hole to tail of slate and the number of linear metres of batten per m 2 of roof. Roofing battens are nailed into the rafters or roof joists or trusses and provide support for the roof tiles or slates. Batten gauge can sometimes be altered however to adjust headlaps or change the spacing between slate courses so the top area of visible slates on a roof look neat.