How To Felt And Batten A Slate Roof

The batten gauge can also be calculated using the formula.

How to felt and batten a slate roof.

What roof pitch do i need for what slate size 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. Roof battens and gauge the gauge is the space between the roof battens this will set the overlap of your chosen slate in most cases. Holing gauge batten gauge headlap 10mm. Start at the lower edge of the roof nailing the batten into place at the centre of the rafter.

Joints should be directly over rafters with the batten square cut tightly butted and skewed nails. Underlay is generally held in place by the tile battens but where nailing is required nails should be extra large head felt nails of 3 35 mm shank diameter and 20 mm long. If a batten end is to be set in mortar be sure an appropriate treatment has been applied. Start at the lower edge of the roof and position the first batten so that the slates tiles give the required overhang over the fascia set the distance at both ends of the roof and run a string line between check along the line to make sure that the distance is fairly consistent and satisfactory fascia boards may sometimes wonder a little bit but this can be checked by eye looking along the front face.

Lay the underlay starting at and parallel to the eaves maintaining a consistent tautness. Batten gauge length of slate headlap 2. 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. The most commonly used slate size in southern england is 500x250mm and 400x250mm in scotland and the north of england.