These are often simple gables. A tear-off can be a clean, short project if the deck is sound and there is only one layer. That is the hopeful case. The unhopeful case is a second layer over soft boards, which the sandy look from the lawn will not reveal. Open a test patch. July's run of days above 30°C, about 13.7 in the Kamloops normals, is why the surface died. It is not a code citation. The code citation you do have is the lower 1.8 kPa ground snow pressure for north of the highway, plus the permit bulletin if weight or pitch changes.
Do not import a hillside specification
Snow guards, ice-dam membranes on every eave, and a metal roof chosen only to shed a Dufferin load are a mismatch unless your particular roof has a cold pocket or a door in the slide path. Spend the attention on underlayment, drip edge, and a covering that can take sun. Metal is optional, not mandatory, and it lives on the city metal page rather than a Brocklehurst duplicate. Westsyde is the treed cousin of this flat. If your lot is actually up the river under a canopy, use that page so the debris problem is not ignored.
One test opening tells you more than the colour
On these simple gables, ask for one opened spot at the eave and one at a place that felt soft underfoot. If both show solid wood and one layer, the replacement is a covering job. If the eave is punky from a gutter that overflowed for years, the scope grows before any shingle is chosen. That is the Brocklehurst pattern: sun kills the surface, and a neglected corner kills the wood. Westsyde's tree valleys are a different failure. Do not mix the two prescriptions.
Small repairs of a few tabs stay on Brocklehurst repair. The orchard history is on the hub. Call (236) 836-0303 and say whether the whole slope looks bare or only the ridge has cracked.