Retaining Walls Built to Drain in Yakima, WA
Walls fail from water, not weight. Every wall we build gets a foot of clean drain rock, filter fabric and a pipe that daylights somewhere it can actually get out.
What We Build
About a third of our work is rebuilding walls somebody else built without drainage. We'd rather be the first call than the second.
It's Water. It's Almost Always Water.
People assume a leaning wall was built too thin, or the blocks were cheap. Occasionally. Mostly it's that nobody dealt with the water.
Dry soil is heavy. Saturated soil is a great deal heavier, and on top of the extra weight it exerts hydrostatic pressure — water pushing sideways in every direction at once. A wall designed for dry backfill and then asked to hold back saturated backfill is being asked to do a different, much harder job than the one it was built for.
The fix is unglamorous and completely invisible: a zone of clean, open-graded drain rock immediately behind the blocks, filter fabric so the surrounding soil can't migrate in and clog it, and a perforated pipe at the bottom that daylights somewhere real — not into a gravel pocket, not into a pipe that stops, somewhere water can genuinely leave.
In an irrigated valley like this one that matters more than it would elsewhere. There is groundwater moving through these slopes most of the season.
- ✓Twelve inches of clean drain rock, not native backfill
- ✓Filter fabric between the rock and the soil, every time
- ✓Perforated pipe daylighted where water can actually leave
- ✓Surface water intercepted above the wall, not just behind it
Four Things You'll Never See Again After Backfill
Everything that determines whether a block wall lasts thirty years is buried before the last course goes on. This is the order it happens in, and it's why we photograph as we go.
The base — compacted, level, buried
Six to twelve inches of compacted crushed base, and the first course set at least one block below finished grade, dead level. Everything above inherits this. A wall leaning at year three was almost always set on a base that wasn't level or wasn't compacted, and nothing above can correct it.
The drainage zone
Clean drain rock against the back of the block, filter fabric wrapping it, perforated pipe at the base with fall to an outlet. This is the single component most often left out, because once soil is over it nobody can tell.
The geogrid layers
Sheets of structural grid laid between courses and extending back into the retained soil, tying the wall to the mass of earth it's holding. On a wall that needs grid and doesn't have it, the blocks are a facade in front of a landslide.
Backfill in compacted lifts
Placed and compacted in shallow layers, not pushed in at once. Loose backfill settles for years and takes the surface above it — the patio, the lawn, the fence — down with it.
Worried About a Wall You Already Have?
We'll dig a small hole behind it and tell you what's there. If there's a drainage layer you'll sleep better; if there isn't, you'll know before it moves rather than after.
What a Leaning Wall Is Telling You
We rebuild a lot of other people's walls. These are the causes, roughly in order of how often we find them.
No drainage at all
Native soil packed straight against the back of the block. Comfortably the most common thing we find, and it means the wall was holding back saturated soil from its first wet season.
Missing geogrid
A wall tall enough to need reinforcement built without it. Often looks perfect for five or six years and then bulges in the middle, which is the grid's absence becoming visible.
An unlevel or uncompacted base
Errors at the bottom course multiply with every course above. You can usually read it in the joint lines — they fan open toward one end.
Unaccounted surcharge
A driveway, a pool, a shed or a rising slope added above a wall designed for lawn. Nothing about the wall changed; the load did.
No embedment
The first course sitting on the ground rather than buried below grade, so there's nothing resisting the wall sliding forward at the bottom.
Above About Four Feet, It Isn't Landscaping Any More
There is a height at which a retaining wall stops being a garden feature and becomes a structure that can hurt somebody. Most jurisdictions draw that line at roughly four feet of exposed height — and lower when something above the wall adds load.
Past it you need a permit and a design stamped by an engineer, which means soil parameters, a global stability check, specified geogrid spacing and an inspection. It costs real money and it takes real weeks.
Which is precisely why a five-foot wall sometimes comes back surprisingly cheap from somebody. That bid is usually a bid to build it without the permit and without the engineering — and the exposure for an unpermitted structure lands on the property, meaning on you, at the point of sale if not before.
A terraced pair of shorter walls is genuinely sometimes the better answer, and we'll price both so you can see the trade honestly rather than being steered.
- ✓We'll tell you which side of the line your wall is on, first visit
- ✓Engineer's design and permit submittal handled by us
- ✓Terracing priced as an alternative where it genuinely works
- ✓No unpermitted structural walls, whatever the schedule pressure
Why Paver Patios Move, and Why Ours Don't
Pavers almost never fail because of the pavers. They fail because of what's underneath and what's holding the edge.
Base compacted in lifts
Four to six inches of crushed base for a patio, more under a driveway, placed in shallow layers and compacted each time. A single thick dump cannot be compacted through, and that's the origin of most sunken areas.
Edge restraint, always
Pavers are held in place by their edges. Without a proper restraint spiked into the base, the perimeter units migrate outward and the whole field loosens from the outside in. Soldier courses without restraint behind them look right and aren't.
Pitched to drain
Around an eighth of an inch of fall per foot, away from the house. Flat looks better on paper and holds water in practice, and water in the base is how a patio heaves in a Yakima winter.
Polymeric sand, swept properly
Joint sand locks the field together and keeps water out of the base. It has to fill the full joint depth, which takes more passes and more patience than most crews give it.
Bedding sand kept thin
One inch of screeded bedding sand, not three. A thick sand layer is not a base — it's a cushion that will consolidate unevenly under traffic and telegraph every wheel path.
Cuts made, not forced
Saw-cut closures at edges and around features rather than wedged slivers. Slivers work loose first and they're the detail that makes a patio look homemade after two years.
Around the Yakima Valley
Five Steps, and You Get Photographs of Three of Them
Because the three that matter most are buried before you see the finished wall.
Measure & assess
Exposed height, what sits above, where water comes from and where it can go. We tell you on this visit whether an engineer is involved.
Design, permit if needed
Block system, grid spacing and drainage detailed. Over four feet, an engineer's stamped design and the permit submittal.
Excavate & base
Over-excavate behind the wall line, then base rock compacted and levelled. Photographed. This day sets the whole wall.
Build, drain, grid
Courses laid, drain rock and pipe placed, geogrid rolled out at the specified courses. Photographed before anything is buried.
Backfill & finish
Compacted lifts, caps set and adhered, grading above the wall so surface water is intercepted rather than dumped behind it.
What Owners Ask Before Building a Wall
What does a retaining wall cost in Yakima?
Segmental block walls generally run $35 to $70 per face foot — that is, per square foot of wall you can see — installed with proper drainage. Natural stone and boulder walls sit higher. The spread comes from height, access for machinery, how much excavation is needed behind the wall, and whether an engineered design is involved. A short garden wall is a different order of job from a six-foot structural one and they shouldn't be compared by the foot.
Why is one bid thousands cheaper than another?
Almost always one of three things: no drainage layer, no geogrid, or no permit and engineering on a wall that needs them. All three are invisible in the finished wall, which is exactly why they're the things that get cut. Ask every bidder to write down the drain rock depth, whether geogrid is included and at what courses, and whether a permit is required. The cheap bid usually goes quiet.
Is a taller wall or two shorter ones better?
Terracing genuinely helps sometimes — it can keep both walls under the engineering threshold and it looks softer on a slope. But the upper wall becomes a surcharge on the lower one if they're too close, so it isn't automatically cheaper or simpler. We price both where both are viable and show you the difference.
What is geogrid and does my wall need it?
It's a structural grid laid between block courses and extending back into the soil behind, tying the wall to the mass of earth it retains. Whether you need it depends on height, soil and what's above — generally anything past three or four feet does. Without it a tall block wall is a facade in front of a slope, and it will usually bulge in the middle rather than tip cleanly.
Do you really photograph the work before backfilling?
Yes, and you get the photos. Base preparation, drain rock and pipe, and each geogrid layer. It costs us nothing and it's the only way you can ever verify that the expensive invisible parts are actually in there. We think any contractor should be willing to do this.
How long does a wall take?
A straightforward residential block wall is typically three to six days on site. Add a week or two of lead time for materials, and for anything needing an engineer add several weeks for design and permit. Boulder walls can be quicker; anything needing significant excavation or shoring behind it takes longer.
My wall is leaning. Can it be fixed, or does it come down?
It depends on why. Movement caused purely by water sometimes stabilises once drainage is added behind it, and a modest lean can occasionally be left and monitored. But a wall that's bulging, where courses have separated, or that was built with no geogrid on a height that needed it, is generally a rebuild. We'll dig behind it and give you the honest answer rather than the convenient one.
Water is pooling behind my wall. Is that the problem?
It's a strong sign there's no functioning drainage, or the outlet is blocked. Sometimes the pipe is there and its daylight point has silted up or been buried by later landscaping, which is a cheap fix and worth checking first. That is one of the reasons we start by digging a small hole rather than by quoting a rebuild.
Tell Us the Height, and What's Above It
Those two answers decide whether an engineer is involved, which decides most of the cost and all of the schedule. We'll measure within a few days.