The United States began enforcing additional 50% tariffs on selected Canadian goods on Aug. 22, 2026, after trade talks failed to produce an agreement. Covered categories include cement and concrete products, plywood and engineered wood, softwood lumber, paint, kitchen cabinets, certain steel products and select electrical components including fiber cable.
Canada supplied roughly 22% of U.S. cement imports from 2020 through 2023. In New York and Washington State, Canadian cement has historically supplied up to 36% of local consumption. National cement is averaging roughly $165 to $169 per short ton in 2026, up from about $148 to $160 in 2025.
Cement is the clearest problem because it is the least substitutable. Steel and aluminum have domestic and third-country alternatives at a price. Cement is heavy, cheap per ton and expensive to move, so supply is inherently regional — and for the northern tier, regional means Canadian.
The most exposed projects are those with the highest cementitious content per dollar of budget: highways, infrastructure, industrial slabs, podium and tilt-wall construction, and mid-rise multifamily. A tilt-wall spec box and a highway package have no design substitution available.
The rate is not uniform across a job. Actual exposure runs off Harmonized Tariff Schedule classification, country of origin, entry date and applicable tariff program — which means the number in a GMP is not knowable from the headline.
Implications. The contractual exposure is separate from the cost exposure and often larger. A fixed-price GMP negotiated before Aug. 22 allocates this risk according to its change-in-law, force majeure and tariff provisions — and many contracts are silent or ambiguous. Silence in a rising-cost environment defaults to the party holding the price. Pull every open GMP, re-read those clauses, then get supplier quotes with a stated validity period in writing.
Key Takeaways
- The tariff didn't change what the building costs. It changed who is holding the difference.
- A headline rate is not a bid — get the supplier quote and its expiration in writing.
- Silence in a change-in-law clause defaults the risk to whoever is holding the price.
Construction Dive — Canada tariffs put pressure on concrete, cement prices, Aug 2026 · Architect's Newspaper — Trump's tariffs on Canadian plywood take effect, Aug 2026 · Associated General Contractors of America — Tariff Resource Center for Contractors · ConstructConnect — US-Canada trade deal falls apart, tariffs take effect
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