How To Felt And Batten A Slate Roof

The most commonly used slate size in southern england is 500x250mm and 400x250mm in scotland and the north of england.

How to felt and batten a slate roof.

If a batten end is to be set in mortar be sure an appropriate treatment has been applied. Lay the underlay starting at and parallel to the eaves maintaining a consistent tautness. The batten gauge can also be calculated using the formula. The holing gauge can be calculated as.

Joints should be directly over rafters with the batten square cut tightly butted and skewed nails. Roofing felt was introduced primarily to act as a secondary barrier against wind driven snow and rain but its use also causes a reduction in air movement within the roof space particularly if the roofing felt is impervious and this effect is often compounded by the introduction of insulation. Holing gauge batten gauge headlap 10mm. 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.

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. Batten gauge length of slate headlap 2. This is not required for dry fix systems. Start at the lower edge of the roof nailing the batten into place at the centre of the rafter.