A retaining wall is only as good as the drainage behind it. Here's why Langley's rain and slopes demand it done right.
Drive around Brookswood or the hillier parts of Langley and you'll spot retaining walls that are leaning, bulging, or pulling apart at the seams. Almost every one of them failed for the same reason, and it isn't the blocks or the stone. It's water.
Water is heavy, and it has to go somewhere
A retaining wall holds back soil. When it rains, that soil soaks up water and gets heavier, and the water itself builds up pressure behind the wall. We call that hydrostatic pressure, and in a wet place like the Fraser Valley it's enormous. A wall built without a way to relieve that pressure gets pushed harder every time it rains.
Eventually the wall does what physics tells it to: it leans out, bulges in the middle, or tips over. No amount of heavy block fixes a wall that has water trapped behind it.
What proper drainage looks like
A wall built to last has drainage designed in from the start:
- A compacted gravel base so the wall sits on something solid, not soil that shifts
- Free-draining gravel backfill behind the wall instead of packed dirt
- A perforated drain pipe at the base that carries water away
- Outlets so that collected water actually leaves the site
- Proper compaction in lifts as the backfill goes in
Why Langley slopes need extra care
Lots in Brookswood, Maple Ridge, and the south side of the township often slope hard, and they shed a lot of water toward the bottom of the grade. That's exactly where retaining walls go, so they take the brunt of the runoff. A wall in that spot without drainage doesn't stand a chance over a few wet winters.
Height matters too. Past a certain height a wall needs engineering, and we'll tell you when you're in that territory rather than building something that won't hold.
Build it once
A retaining wall is one of those jobs where doing it right the first time is far cheaper than doing it twice. The drainage and base are the parts you can't see once it's done, and they're the parts that decide whether the wall is still standing straight in ten years.
If you've got a slope to hold or a wall that's already starting to lean, give us a call. We'll look at the grade, the soil, and where the water goes, and build something that stays put.