The Ontario Building Code | Caulked Lead Drainage Joints
7.3.2.1. Caulked Lead drainage Joints
(1) Every caulked lead drainage joint shall be firmly packed with oakum and tightly caulked with lead to a depth of at least 25 mm.
(2) No paint, varnish or other coating shall be applied on the lead until after the joint has been tested.
(3) Caulked lead drainage joints shall not be used except for cast iron pipe in a drainage system or venting ="http://thehandyforce.com/interior/bathroom-renovations/" title ="Toronto Bathroom renovation inspiration">venting system, or between such pipe and,
(a) other ferrous pipe,
(b) brass and copper pipe,
(c) a caulking ferrule, or
(d) a trap standard.
(4) A length of hub and spigot pipe and pipe fittings in a drainage system shall be installed with the hub at the upstream end.
In Plain Language
Caulked lead drainage joints, an older joining method, must be tightly packed with oakum and caulked so the connection is fully sealed against leaks.
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.