Denver Stem Wall Contractors

Think about everything that happens along that band of concrete between your siding and your dirt. The hose bib comes through it. So does the dryer vent, the radon pipe, the condensate line, and whatever the last electrician drilled. You shovel snow against it in January. You pile mulch on it in May. The trash cans live on it, the crawl space hatch opens into it, and the deck is bolted to the framing sitting right on top of it.

Nobody thinks of a stem wall as something you use. But it touches your household more than most of the house does, and in Park Hill and University Hills we spend a lot of time repairing walls that were fine until daily life got layered onto them. We pour new ones too, for additions, garages, and infill builds. Either way, what happens at that band decides whether the crawl space is dry.

The three feet nobody maintains

A stem wall lives half in the weather and half in the ground, and the worst spot is where those two meet. That's where deicer splash lands, where snow gets piled and melts slowly against the face for a week, where mulch holds moisture against concrete never meant to be buried that high. Every one of those is a habit, not a defect. Habits are what wear these walls out.

Below the line, the story is what somebody shoved back into the trench. Native clay dumped straight back holds water like a basin and hands it to your wall at leisure. Free draining material against the concrete gives that water a route down to a drain instead of a place to sit. You can't see which one you have. You find out during a wet spring, with a flashlight.

The walk we do around your stem wall

• Grade at every side, including the tight run along the fence nobody checks
• Downspout discharge points and whether they clear the old trench line
• Mulch, soil, or rock built up above the top of the concrete
• Every penetration: hose bib, dryer vent, condensate, gas, electrical, radon
• Spalling or flaking at the base, which usually means standing water and salt
• Vapor barrier condition and any standing water inside the crawl space

Everyday habits and what they do to the wall

Rebuilding a wall while the house stays put

Most of our repair work on older Denver stem walls happens with the house still standing on it, which changes the sequence. We open a section at a time, shore the framing above, take out what's failed, form and pour with steel doweled into what stays, then let it gain strength before moving down the wall. Slow by design.

While the trench is open we do the work that never gets a second chance. Damproofing on the buried face, drainage board where the water volume calls for it, a perforated drain in washed rock wrapped in fabric, and free draining material against the wall instead of the clay that came out. Then final grade cut to fall away. That only happens while the dirt is off.

How the seasons show up down there

Spring is when the crawl space tells the truth. Snowmelt plus a wet April is the annual stress test, and if the drain is plugged or the grade tips the wrong way you'll smell it before you see it. Go look with a light in April. Schedule the repair for later, because saturated soil makes a miserable excavation.

Pour season is long. Stem walls go in nearly year round, with heated mix water, non chloride accelerator, and blankets when it's cold, and we never place on frozen bearing. What we watch harder than the concrete is backfill. Frozen clay doesn't compact, it bridges, and in April it thaws into voids that show up as a sunken walkway. When the ground is frozen we wait or import material that behaves.

Nine out of ten wet crawl spaces I get called into, the concrete is fine. Somebody just spent twenty years pointing water at it and nobody connected the two.Our crew lead, after the walkthrough