How deep do footings need to be in Edmundston NB versus Moncton?

Footings in Edmundston must go 1.5 metres (5 feet) deep, while Moncton footings need to reach 1.2 metres (4 feet) deep. This difference exists because northern New Brunswick experiences deeper frost penetration than the southern regions.

The frost depth requirement is absolutely critical for deck safety in New Brunswick. When footings don't extend below the frost line, the freeze-thaw cycle will cause them to heave upward during winter, creating dangerous structural movement that can damage your deck, railings, and even your house if the deck is attached.

Edmundston's northern location means the ground freezes deeper during our harsh winters. At 1.5 metres deep, you're looking at significantly more excavation work and concrete compared to southern NB. Each footing hole needs to be at least 10 inches (250mm) in diameter, so you're moving substantial amounts of soil. This extra depth typically adds $100-200 per footing compared to Moncton installations.

Moncton's milder maritime climate allows for the shallower 1.2-metre depth, but don't let "shallower" fool you — that's still 4 feet down. Many homeowners underestimate this requirement, but there's no compromising on frost depth in New Brunswick. Even being 6 inches short can result in footing movement.

Practical implications for your project: In Edmundston, expect deck construction to cost slightly more due to the additional excavation and concrete required. The extra depth also means footings take longer to dig, especially if you hit clay or rocky soil common in the upper Saint John River valley. In both cities, footings should be poured between late May and September when ground conditions are workable and concrete can cure properly in temperatures above 10°C.

Professional installation is strongly recommended for footings in both locations. The consequences of improper depth — deck collapse, structural damage, insurance issues — far outweigh any potential DIY savings. A qualified deck builder will know the exact frost depth requirements for your specific location and ensure proper installation.

Need help finding a deck builder familiar with northern or southern NB frost requirements? New Brunswick Decks can match you with local contractors who understand these regional differences and will ensure your footings meet code.