Harmony Roof Tiles use timber battens which comply with Australian Standards AS1684–1992 and AS2082–1979.

Rafter /Truss Spacings Minimum Batten
up to 600 mm 38 x 25 mm
600 - 900 mm 50 x 38 mm
900 x 1200 mm 50 x 50 mm

NOTE:

For spacings up to 600mm, 50 x 25mm battens can be used ir specified.