Should I upgrade from 3-tab to architectural shingles?

Most 3-tab roofs left in the region are on 1970s–90s houses in Esquimalt, Colwood and the older parts of Langford, plus the odd Gordon Head rancher that was re-roofed cheaply in the 2000s. When those come up for their next roof the question is real: the crew will quote laminate by default, and the homeowner wonders whether the plainer shingle they have lived under for 20 years would be cheaper again.

On the exposed south side of Colwood and Royal Bay, and along Sidney's waterfront, wind is the deciding argument. 3-tab tabs lift at their exposed edges in southeasterlies; laminate's two-layer construction and heavier weight hold better. In shaded Saanich the argument is appearance: moss damage and granule loss on flat 3-tab reads as streaks from the street, while laminate's shadow lines hide the same wear for years longer.

Labour, tear-off, underlayment and flashing cost the same whichever shingle goes on top, so the upgrade is only the difference in shingle price, typically a modest share of the whole job. What you get for it is a heavier, two-layer shingle with a longer limited warranty, a higher wind rating and a random pattern that hides the granule loss and moss shadows that show plainly on flat 3-tab.

Published Victoria tiers put asphalt at roughly $4 budget, $8 average and $13 premium per square foot; 3-tab lives at the budget end and mid-grade laminate near the average. Our model's $5.50–$10 range assumes laminate.

3-tab is not a mistake everywhere.

• Outbuildings, carports and sheds where lifespan and looks matter little
• Matching one damaged slope on an existing 3-tab roof you are not replacing yet
• A rental or flip you will sell within two or three years, where a documented new roof matters more than its grade
• A roof with no wind exposure and full sun, where 3-tab's shorter life is less of a penalty

If the budget only stretches to one upgrade, spend it below the shingle. Synthetic underlayment instead of felt, ice-and-water membrane in every valley and at the eaves, new flashing rather than re-used metal, and a proper ridge-and-soffit ventilation path do more for a Victoria roof's life than the step from 3-tab to laminate. Algae-resistant granules are the other worthwhile add-on on shaded north slopes, where black streaking appears within a few years on standard shingles.

Ask the roofer to quote laminate as the base and 3-tab as an alternate, so you can see the true difference on paper rather than guessing.