Retaining Wall Drainage Correction in Cedar Rapids, IA
Cedar Rapids Retaining Walls corrects drainage behind retaining walls for homeowners in Cedar Rapids, Marion, Hiawatha, Robins, Mount Vernon, and across Linn County, Iowa. This is the job for a wall that is still sound and still wet: the face is straight, the base is solid, and water is the only thing wrong.
The fix has four parts and every one of them matters. Washed angular drainage stone replaces the dirt backfill against the wall, running from the base course to within a few inches of the top. Non-woven filter fabric wraps the boundary between that stone and the native soil, because loess and clay migrate into open stone with every rain and a stone column full of silt drains nothing. A perforated pipe with a fabric sock lies at the bottom of the stone and runs on a steady fall to an open outlet. Surface water gets cut off before it ever reaches the fill. What we replace is the common alternative, which is a few holes punched through the face and clay packed everywhere else.
Freeze-Thaw Is the Local Argument
Rain is the obvious reason for drainage stone. Winter is the better one. Clay behind a wall holds water, that water freezes and expands, and Cedar Rapids crosses freezing and thaws again over and over between fall and spring. Each swing shoves the wall out a fraction. Open stone drains before it can freeze into a solid mass, so the wall sees the soil load and nothing else.
Water From Above the Wall
Half of what soaks a wall never came through the ground. It ran across it. A grade sloping toward the top of the wall, a patio shedding the wrong way, a downspout dumping into the bank, a driveway that funnels every storm to one corner. We shape a swale, set a surface inlet, or extend a discharge line so that water goes around the wall instead of into it.
Blocked and Frozen Outlets
Plenty of walls have a pipe already, and the pipe ends in mulch, under sod, or crushed by a machine tire. A buried outlet at the bottom of a slope also freezes shut in January and stays shut while the thaw water arrives. We locate the end, open it, and set it where a homeowner can see it and check it.
Booking
Wet spring ground shows us where the water goes, so spring is a good time to look and a poor time to dig. We schedule the digging around it. (319) 555-0129 gets an assessment on the calendar.
Can you fix the drainage without taking the wall apart?
Sometimes. Water arriving from above the wall gets cut off at the surface with a swale, a trench drain, or a rerouted downspout, and none of that touches the wall. Water already sitting inside the backfill is a different job, and reaching it means opening the back of the wall. On a dry-stacked block wall we often take down the top courses only, work from there, and reset them. Where the stone column is missing top to bottom, the run comes apart.
Do weep holes actually work?
They drain the water that reaches them, and that is all. A weep hole does nothing for water sitting in the middle of the fill three feet back, and it plugs with silt and roots over time. Weeps belong on a poured or mortared wall as one part of a drainage plan that also includes stone and a pipe behind the wall. They are not a substitute for either.
Where should the drain pipe come out?
Somewhere lower than the pipe, out in the open, where the water leaves under its own weight. The end of the run gets a rodent grate and stays clear of mulch and sod. A pipe that stops inside the backfill collects water instead of moving it, which is worse than no pipe at all. Where the grade gives us nothing to fall to, the outlet goes into a sump or a pop-up in a low corner of the yard.
Can a downspout be the reason my wall is wet?
Often, yes. A downspout discharging above or behind a retaining wall drops a roof's worth of water straight into the fill, over and over, all season. We extend it in solid pipe past the wall and out to daylight. The same goes for a sump discharge, a driveway that sheds toward the wall, and a neighbor's downhill grade running into your slope.