The Ontario Building Code | Materials
9.26.5.2. Materials
(1) Eave protection shall be laid beneath the starter strip and shall consist of,
(a) No. 15 asphalt-saturated felt laid in two plies lapped 480 mm and cemented together with lap cement,
(b) Type M or S roll roofing laid with not less than 100 mm head and end laps cemented together with lap cement,
(c) glass fibre or polyester fibre coated base sheets, or
(d) self-sealing composite membranes consisting of modified bituminous coated material.
9.26.6. Underlay Beneath Shingles
In Plain Language
Materials used for eave protection must conform to the standards referenced in this article, ensuring reliable performance against ice-dam-driven water infiltration.
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.