The Ontario Building Code | Lapped Strip Siding
9.27.8.5. Lapped Strip Siding
(1) Plywood applied in horizontal lapped strips shall have not less than a 2 mm gap provided at the butted ends, which shall be caulked.
(2) The horizontal joints of siding described in Sentence (1) shall be lapped not less than 25 mm.
(3) Wedges shall be inserted under all vertical butt joints and at all corners when horizontal lapped plywood is applied without sheathing.
9.27.9. Hardboard
In Plain Language
Lapped strip siding of this material must be installed as set out in this article, an alternative installation pattern to panel cladding.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.