Primtiles Roofing are supported on roof battens on the rafters. Tack the eaves battens against the fascia board. Then set and tack the second batten to 305mm from the eaves batten. Lay the rest of the battens to the module length 305mm across the rafter, up to the ridge and track them in position. (Fig 1). Batten are cut to length so they butt together on top of the ragters. (Fig 2)