With the joints between them aligned with the centre of the tiles above and below and with about 3mm between the sides.
Setting out rosemary roof tiles.
Set the last batten at the ridge so that the ridge tiles will overlap the top course of tiles by at least 75mm.
These tiling guides were produced by the technical committee of what used to be the clay roofing tile council crtc.
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Laying the tiles plain tiles are laid on the battens in a brick bond pattern i e.
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To ensure this the battens should be at least 1 2m long.
Tiles must be laid broken bond in a half bond pattern but the side lap may be reduced to a minimum of a third of the width of the tile 55 mm in some circumstances e g.
It is also important aesthetically so that the tiles on the finished roof are equally spaced.
Setting out up the roof gauge set the first batten at eaves to allow the tails of the eaves course tiles to overhang the fascia by 40 to 45mm ie.
Tiles must be hung on their nibs.
Adjacent tiles should be laid with a nominal gap of 1 5 mm maximum 3 mm.
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Battens should be fixed to rafters set at centres not more than 600 mm apart and should span at least 3 rafters.