Is it worth getting a fence with concrete post footings in Metro Vancouver or can I just use gravel?

Concrete post footings are strongly recommended — and effectively required — for any permanent fence in Metro Vancouver's wet marine climate. While gravel-only post setting (also called dry-pack or tamp-and-pack) works adequately in drier regions with stable, well-drained soil, Metro Vancouver's heavy rainfall, soft ground conditions, and seasonal wind events make concrete the clear choice for long-term fence stability. The small additional cost of concrete — roughly $8 to $12 per post hole including materials and labour — is one of the best investments you can make in your fence's longevity.

The argument for gravel-only post setting usually centres on two claims: that gravel drains better than concrete (preventing rot at the post base), and that concrete traps moisture against the wood. Both claims contain a kernel of truth but lead to the wrong conclusion for Metro Vancouver conditions. The correct approach is to use both — a drainage gravel bed beneath the post with concrete above. This gives you the drainage benefits of gravel exactly where moisture accumulates most (at the post base) with the structural stability of concrete holding the post firmly in place.

Why Concrete Is Essential in Metro Vancouver

Soil saturation during the wet season is the primary reason gravel-only settings fail in Metro Vancouver. From October through March, the region receives roughly 70 percent of its annual 1,200mm+ of rainfall. The soil around fence posts becomes saturated, heavy, and soft. A gravel-only post setting relies on the friction between the compacted gravel and the surrounding soil to hold the post in place. When that surrounding soil is waterlogged and soft, its lateral holding strength drops dramatically. Posts set in gravel alone in Metro Vancouver commonly begin leaning within one to three years, especially during winter storms when saturated soil combines with strong winds.

Wind load on solid privacy fences is another critical factor. A 6-foot solid board fence acts as a wind sail, and a single 8-foot fence section presents roughly 48 square feet of wind-catching surface. During winter storms — particularly the mountain outflow winds on the North Shore and gusts through the Fraser Valley — significant lateral force transfers directly to the posts. Concrete footings provide a rigid anchor that resists this force. Gravel alone cannot match this holding power, especially in wet soil.

Frost heave is minimal but soil movement is not. Metro Vancouver rarely experiences deep ground freezing, so frost heave (which pushes posts upward in cold-climate regions) is not a major concern. However, the wet-dry cycle between summer and the rainy season causes clay and silt soils — common in Richmond, Delta, Surrey, and low-lying areas — to expand and contract seasonally. This cyclical movement gradually loosens gravel-only post settings over time.

The Correct Method: Gravel Plus Concrete

The best practice for Metro Vancouver fence post installation combines both materials in a specific sequence:

Step 1: Dig the post hole to the correct depth — minimum 24 inches for a 6-foot fence, 30 to 36 inches for 8-foot fences, gate posts, or wind-exposed locations. The hole should be 10 to 12 inches in diameter for a 4x4 post, or 12 to 14 inches for a 6x6.

Step 2: Add 4 to 6 inches of drainage gravel (crushed rock, not pea gravel) to the bottom of the hole and tamp it firmly. This gravel bed is the critical drainage layer — it allows groundwater to drain away from the bottom of the post rather than pooling against the wood.

Step 3: Set the post on the gravel, plumb it (verify it is perfectly vertical), and brace it temporarily.

Step 4: Pour concrete around the post from above, filling the hole to slightly above grade level. Crown the top of the concrete so it slopes away from the post — this directs rainwater away from the post base rather than channelling it down alongside the wood.

Step 5: Allow the concrete to cure before attaching rails and boards. Standard concrete needs 24 to 48 hours; fast-setting products achieve working strength in 20 to 40 minutes.

This method gives you the drainage protection of gravel where it matters most (at the wood-soil contact point at the bottom) with the structural rigidity of concrete above. It is the standard technique used by professional fence contractors throughout Metro Vancouver.

Cost Impact

Concrete adds approximately $8 to $12 per post hole to the project cost, covering two to three bags of pre-mix concrete and the labour to mix and pour. For a typical fence with 25 to 35 posts, that is $200 to $420 total — a modest investment that prevents the far more expensive problem of having to reset leaning posts or rebuild a failed fence within a few years. Resetting a single leaning post costs $150 to $400 because it requires extracting the old post, removing whatever anchoring material was used, re-digging, and re-setting properly.

When Gravel-Only Might Work

The only scenario where gravel-only post setting is acceptable in Metro Vancouver is for temporary fences intended to last two to three years — such as construction site perimeter fencing or a short-term barrier during a renovation project. For any permanent residential or commercial fence, use concrete with gravel drainage.

Need help finding fence contractors who install to Metro Vancouver standards? Vancouver Fence Builders can match you for free through the Vancouver Construction Network.

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