Anybody who has wrestled a wheelbarrow up Benefit Street knows why a concrete retaining wall in Providence isn't decoration, it's the only thing keeping the yard out of the neighbor's kitchen. We build them across the East Side, Elmhurst, Cranston and Pawtucket, and at Providence Concrete Company the part we refuse to rush is the part nobody sees: the crushed stone, the perforated pipe, the retaining wall drainage that keeps February frost from shoving your block wall out of plumb by spring. A wall that fails almost never fails at the face. It fails behind it.
Here's what you get from my crew. We show up when we said we would, we answer the phone instead of letting it ring to voicemail, nobody talks down to you about your own yard, and the driveway gets swept before the truck pulls out.
Below I'll walk you through block and poured concrete walls, how the work actually goes, what moves the price, and the questions folks ask before they book. Call me at (401) 394-6425 and I'll come stand on the slope with you.
Block Retaining Wall
A block retaining wall lives or dies on the part you never see again once it's built. We dig below frost, lay six inches of compacted crushed stone, and bury the entire first course so the wall has something to lean into when February does its thing. Then the retaining wall drainage: perforated pipe running to daylight, a foot of clean three quarter inch stone behind the block, filter fabric between that stone and the soil so it doesn't silt up in three winters. Skip it and water pressure bellies the middle out like a bad fence on Broad Street.
Height, the grade of your yard, and whether we're holding back a driveway retaining wall on a College Hill slope are what move the number. At Providence Concrete Company most residential runs go up in two to four days.
Concrete Block Retaining Wall
A concrete block retaining wall is the workhorse of this trade, and most of the ones we build in Providence start with six inches of compacted crushed stone under the first course, not dirt somebody raked flat with a shovel. Get that wrong and the whole thing telegraphs it by the second winter. We back every wall with washed stone and a perforated pipe daylighted out the low end, because retaining wall drainage is what actually holds the hill, not the block. You can see the skipped version all over the East Side: an old cinder block retaining wall with no drain, bellied out and weeping salt. Height, access for the machine, and whether it carries a driveway retaining wall load are what move the number. At Providence Concrete Company we build the tall ones stepped back into the slope rather than straight up.
Interlocking Retaining Wall Blocks
Interlocking retaining wall blocks are the ones with a lip or pin cast into the back, so each course locks into the one under it and the wall leans into the hill instead of out toward your patio. Grown-up Lego, basically, and just as unforgiving if the bottom row is off. We dig out, compact six inches of three-quarter inch crushed stone, and then spend the longest stretch of the day getting that base course dead level, because a quarter inch of wobble down there is three inches of crooked by the fifth course. Behind the interlocking concrete block goes clean stone and perforated pipe run out to daylight, since retaining wall drainage is what stops February from shoving the face out. Most of these take our crew at Providence Concrete Company three to five days, caps glued last.
Gabion Wall
A gabion wall is a stack of galvanized steel mesh baskets packed with stone, and it earns its keep where a poured concrete wall would fight the water instead of letting it through. Drainage is free, since the whole face breathes. We use PVC-coated mesh anywhere near salt air off the bay, because bare zinc gives up early around here, and we hand-pack the visible faces with 4 to 8 inch angular stone rather than dumping rounded river rock that rolls loose by the second winter. Internal bracing wires stop the bellying you see on baskets somebody filled in a hurry.
A 30 foot run at three feet tall usually takes us two or three days. Stone choice, wall height, mesh coating and how close a truck can get all move the number, and Providence Concrete Company can also tie gabions into low planter walls along the same grade.
Cement Retaining Wall
A cement retaining wall is what most people picture when they call: one solid gray face holding a hillside back, no joints, no stair steps. Providence Concrete Company digs the footing below the frost line, which around here means about three and a half feet, because a wall sitting on eight inches of topsoil will lean out on you by its third February. Rebar on twelve inch centers, forms, then a pour that we keep damp while it cures.
Drainage is where these fail, not strength. Crushed stone behind the stem, perforated pipe out to daylight, weep holes through the face, fabric so the stone doesn't silt up. Water pushes harder than dirt ever will.
Height, length, footing depth and whether a truck can reach the back yard are what move a cement wall's price.
Rockery Wall
A rockery wall is the one job where the material shows up on a truck looking like it came out of the ground down the street, because in Rhode Island it usually did. We set quarried granite boulders, generally two to four feet across, in a keyed trench about a foot below grade, each course battered back into the slope so gravity works for us instead of against us. Behind that goes clean drain rock and filter fabric.
Skip the drainage and the March thaw pushes the whole face out like a slow motion bowling ball. We've reset plenty of those at Providence Concrete Company.
Boulder size, access for the excavator and how much slope you're trying to retain move the price more than anything. Steep back yards off Neutaconkanut Hill are a different animal than a flat side yard.
Concrete Wall
A poured concrete wall is what I put in when the grade is steep, the soil stays wet, and there's no room to step blocks back into the hill. We dig a footing below the frost line, tie rebar both ways, set forms, and pour in one shot so there's no cold joint for water to sneak through. Drainage is the part that gets skipped by fast crews: washed stone behind the wall, perforated pipe, weep holes. Leave that out and your handsome poured concrete retaining wall is leaning at you by the third March thaw, and no amount of paint fixes a lean.
At Providence Concrete Company most walls run a couple of weeks start to finish, and a good chunk of that is just letting concrete cure on its own schedule. Height, footing depth and truck access change the work most.
Block Wall Blocks
Block wall blocks aren't all one animal, and picking the wrong one is how a wall ends up leaning into your neighbor's hydrangeas. Small segmental units run around 75 pounds apiece, and two of us can hand-carry them down a tight Federal Hill side yard where no machine fits. The big units, roughly two feet by two by four, weigh better than a ton and need an excavator with room to swing. At Providence Concrete Company we pick the block wall retaining wall units to suit the site: height, access, and what's sitting behind the wall. Every course steps back about an inch, cores and the first foot behind get 3/4 inch clean stone, and caps go on with concrete adhesive rather than mortar. Skip that stone and the wall holds water, and February in Rhode Island will find it for you.
Cmu Block Wall
A CMU block wall is the workhorse of the retaining game, and when we build one here at Providence Concrete Company it starts with a footing poured below the frost line, a good three feet down, because Rhode Island winter will lift a shallow one like a bad lawn ornament. Then 8 by 8 by 16 block, vertical #4 rebar in the cells every 32 inches, and grout poured solid where the load lives.
What kills a block wall retaining wall is skipping the back: no gravel, no drain pipe, no weep holes, and the first wet March turns hydrostatic pressure into a bulge you can see from the street.
Height changes everything. Anything over four feet needs engineering, more steel and a wider footing, same as we'd do with poured concrete walls holding a driveway bank.
Stem Walls
Stem walls are the short concrete walls that sit on a footing and carry a slab, a garage floor, or the low side of a sloped lot, and on College Hill grades we pour plenty of them. We dig the footing below the 42 inch frost line, tie vertical rebar at 24 inches on center, form the wall 8 or 10 inches thick, and set the anchor bolts before the mud goes off. The soil side gets damp-proofing and a perforated pipe in washed stone. Skip that and the wall wicks water all winter, and by March you've got efflorescence and a clammy slab.
Footing one day, wall a couple more, backfill after roughly a week of cure. When a driveway retaining wall doubles as the stem wall under a garage, Providence Concrete Company pours them as one so there's no cold joint to leak. Height, thickness and how much ledge we hit drive the price.
Stone Wall Retaining Wall
A stone wall retaining wall is what most people picture when they think of holding back a slope in this part of the world, and on the East Side we build plenty of them, usually as a poured or block core faced in New England fieldstone or granite. The look is colonial. The engineering underneath is not. We dig below frost, which around Providence means getting the base down past that 42-inch line, then build in three-quarter clean stone behind the wall with fabric so the backfill doesn't clog the drainage rock.
Good fences make good neighbors, Frost said, and good walls stay put.
The ones that bulge and spill across a sidewalk are almost always dry-laid straight on dirt with no batter, no drainage, no cap bedding. That's why at Providence Concrete Company we set the tone and the stone from the bottom up.
Geogrid Retaining Wall
A geogrid retaining wall is what we build when the hill is bigger than the block can hold back on its own. Anything over about four feet, or shorter than that with a driveway or a steep yard pushing from above, gets grid rolled out every second or third course and buried in compacted structural fill. Grid length usually runs 60 to 70 percent of the wall height back into the slope, and we compact in six to eight inch lifts as we go. That's the step crews skip, because nobody sees it once it's covered.
Skip it and you get the College Hill special: looks sharp in October, bellies out by the third March once frost has had its turn.
At Providence Concrete Company we spec the grid before a single block lands.
What the job involves
A concrete retaining wall starts well below the part anybody ever sees. We dig the trench, get under the frost line, and compact a base of three quarter inch crushed stone in six inch lifts, because a wall set on soft fill anywhere on the hills around here will lean out on you by the third spring. Then the courses go up dead level, with drainage stone and a perforated pipe behind them so the water running downhill has somewhere to be that isn't inside your wall. Backfill gets compacted as we climb, not dumped in at the end.
Low garden and planter walls usually run two to three days. Taller work with steps, corners and caps takes longer. Plenty of retaining wall contractors treat drainage as an add-on. At Providence Concrete Company it's the whole job.
What it costs
What a concrete retaining wall costs on your property comes down to height, what the soil behind it is doing, and how hard it is to get a machine into your yard. A three-foot garden wall on a flat lot in Cranston is a different animal from a six-foot terrace holding back a College Hill slope, where we're adding geogrid layers back into the bank and an engineer's drawing before anybody sets a block. Access moves it too. Wheelbarrowing stone through a narrow side yard adds days. So does bad drainage: skip the washed stone and perforated pipe, and the first hard freeze-thaw in February pushes the wall out at the belly. Call me at (401) 394-6425 and we'll price your actual grade, or take a look at what else Providence Concrete Company builds around the same footing.
Why choose us for this
You've got a hillside creeping toward the patio, and a concrete retaining wall is the job you've been putting off since last spring. What you actually want isn't craftsmanship talk. You want to hire somebody once, not babysit them, and not think about that slope again for twenty years.
So here's what we won't do.
We won't quote one number over the phone and hand you a taller one on the invoice.
We won't leave your wall half backfilled while the crew starts a driveway over in Cranston.
We won't lean on you to sign today because the price "expires."
We won't leave block chips, cut-offs and tire ruts in your lawn.
We're not the cheapest bid you'll get. Drainage stone, filter fabric and compacted lifts behind a cement retaining wall take hours some crews skip. An estimate from Providence Concrete Company costs nothing and obligates you to nothing.
Frequently asked questions
How long does a Providence concrete retaining wall last?
Forty years and up, as long as the drainage was built in. We backfill with about 12 inches of clean three quarter stone and run a perforated pipe to daylight, and the footing sits below the frost line, roughly 42 inches down. Skip that and our freeze thaw winters push the wall out by spring. My wall is leaning. Repair or replace? If it's tipped less than an inch and the block faces are sound, we can often rebuild the top courses and add a geogrid retaining wall layer behind them. A bulging cinder block retaining wall with cracked mortar is past saving, and patching it just buys you one more winter.
How do we get started?
Call Providence Concrete Company at (401) 394-6425 and we'll walk the slope, check what's uphill of it, and measure.