(1)
Lumber siding shall prevent water from entering at the joints by the use of lapped or matched joints or by vertical wood battens.
(2)
Siding shall overlap not less than 1 mm per 16 mm width of lumber, but not less than
(a)
9.5 mm for matched siding,
(b)
25 mm for lapped bevel siding, or
(c)
12 mm for vertical battens.