(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.