Crack & Joint Repair in Simla, CO

Simla sits over some of the most expansive clay soils on Colorado's eastern plains. Bentonite-heavy Elbert County soils are notorious for their dramatic moisture response — absorbing water and swelling in wet seasons, then contracting sharply during the dry months. A concrete slab poured over this ground is essentially resting on a surface that moves several times a year. Control joints, expansion joints, and the cracks that form between them are the visible record of that movement, and they need repair materials that can accommodate the same seasonal cycling without cracking themselves. At Simla's elevation, freeze-thaw cycles add a second failure mechanism on top of soil movement. Water infiltrates even hairline cracks, freezes overnight, and expands approximately 9 percent in volume — widening the crack incrementally with every cycle. A crack that measures 1/16 inch in October can become 1/4 inch by March. Left open, cracks also allow water to reach the sub-base, softening it and increasing settlement. Addressing cracks while they're still small is dramatically cheaper than waiting until slab sections have dropped or displaced.

Concrete Doctor uses elastic polyurethane crack fillers and joint sealants — products engineered specifically for concrete repair in environments with ongoing movement. Unlike rigid epoxy injections or cementitious patch materials that re-crack when the slab moves, elastic polyurethane bonds to both crack faces and stretches and compresses with seasonal soil movement. This is the appropriate repair chemistry for Elbert County's bentonite clay conditions. For structural cracks where two slab sections have separated at different elevations, we assess whether mudjacking or slab stabilization is needed before sealing. A cosmetic repair over an unstable sub-base won't hold. Joint repairs follow the same logic — we rout out deteriorated joint filler, clean the joint cavity, and install a backer rod where appropriate before applying sealant at the correct depth-to-width ratio for maximum flexibility. The finished repair moves with the concrete rather than fighting it.

Not all cracks are equal, and misreading a crack pattern leads to mismatched repairs. A single straight crack running parallel to a pour joint is usually a shrinkage crack from the original cure — typically shallow, stable, and addressable with a standard polyurethane sealant. Map cracking or crazing across a large surface area points to surface scaling driven by freeze-thaw cycling or an old, failed sealer that allowed moisture saturation. Step cracks — where one side of a crack sits higher than the other — indicate differential settlement, often driven by bentonite soil swelling unevenly under the slab. Each pattern calls for a different response. Map cracking may be a resurfacing candidate rather than individual crack repair. Step cracks may require sub-base investigation before any surface repair makes sense. Our assessment process identifies the crack type, probable cause, and appropriate fix — we don't apply the same generic repair to every crack we see.

Concrete placed in Simla decades ago was typically cut with control joints to direct where shrinkage cracking would occur — the joints are essentially engineered weak points. Over time, the joint sealant dries out, cracks, or simply falls out, leaving an open gap that funnels water directly to the sub-base and allows debris to fill the joint and create load-transfer problems. Deteriorated joints are one of the most overlooked maintenance items on older concrete slabs in the region. Restoring control joints involves routing out any remaining old sealant and deteriorated concrete edges, vacuuming the joint clean, installing a foam backer rod to establish proper sealant depth, and applying fresh polyurethane joint sealant tooled to a slight concave profile. The process is straightforward but has to be done to proper depth-to-width ratio or the sealant will tear at the bond line rather than elongating when the joint opens. We follow manufacturer specs and industry standards for joint restoration — it matters more than it looks like it should.