Double Lap Tiles ~ these are the traditional tile covering for pitched
roofs and are available made from clay and concrete and are usually
called plain tiles. Plain tiles have a slight camber in their length to ensure
that the tail of the tile will bed and not ride on the tile below. There is
always at least two layers of tiles covering any part of the roof. Each
tile has at least two nibs on the underside of its head so that it can be
hung on support battens nailed over the rafters. Two nail holes provide
the means of fixing the tile to the batten, in practice only every 4th
course of tiles is nailed unless the roof exposure is high. Double lap tiles
are laid to a bond so that the edge joints between the tiles are in the
centre of the tiles immediately below and above the course under
consideration.
Minimum pitch 35°machine made, 45°hand made.
For other types shapes and sections see BS EN 1304: Clay roofing
tiles and fittings. Product definitions and specifications.
Double Lap Plain Tiles