Englewood Concrete Overlays

Homeowners call about overlays with a number already in mind, usually one they got from a tear-out quote somewhere else. Fair enough. But the estimate that comes back from us isn't priced on square feet of topping. It's priced on how much work it takes to get your existing concrete ready to accept one, and that number varies wildly between two slabs on the same block.

A patio that's clean, sound, and drains away from the house might need a grind and a rinse. The one next door, same age, might need crack routing, a shot blast, a partial-depth patch at the step, and a new termination detail at the door threshold before we can put anything down. Same finish at the end. Very different days. So when somebody asks what an overlay runs, the honest answer starts with a hose and a hammer.

What actually moves the number

Substrate condition leads by a mile. If the surface has been sealed, waxed, or coated at some point, all of that has to come off mechanically before a topping will bond, and stripping is slow work. Then there's profile. A dense troweled slab needs shot blasting or diamond grinding to open the pores; a weathered broom finish may already be open enough that a good clean does it. Those two paths differ by most of a day.

Cracks are the second driver, and it's a count rather than a condition. Every one gets routed, cleaned, and filled with a material that moves the way the crack moves. Ten hairlines across a patio is a morning gone. Detail work is third: borders, saw-cut patterns, color changes, and hand-tooled edges all add hours that never show up in square footage.

Then access, which on Englewood lots is real. Mixing stations need somewhere to live and water needs to get back there. Where the only route to the backyard is a three foot gate, everything moves by hand against a pot life clock, and that takes more people.

Where the topping stops

The slabs we turn down, and why

An overlay is a wearing surface, not a structural repair. It adds no strength, spans nothing, and cannot hold two pieces of concrete together. So the test is simple: is the slab underneath stable? If panels have settled at different rates, if a corner has dropped, if there's a crack that opens and closes with the seasons, a topping will reproduce all of it. Sometimes within weeks.

The Englewood version of that problem is usually water rather than the concrete. Older properties in Northwest Englewood and parts of Broadway Estates have downspouts dumping at a slab edge, or grade raised by years of mulch until the patio sits in a bowl. Fix the water and a topping lasts. Ignore it and you've bought a nicer-looking version of the same failure.

The other decline is a spalled slab that's lost real depth. If the top half inch has broken down across most of the area, what we'd bond to is already weak. We pull a test area and check, and when it comes up crumbly we say tear it out.

Everything that happens before a bag gets opened

• Hose the slab and mark every crack, low spot, and area that stays dark
• Strip old sealer or coating mechanically, then confirm with a water-drop test
• Shot blast or grind to an open profile the topping can key into
• Route and fill cracks with a flexible repair material, not a rigid patch
• Rebuild damaged edges and step nosings before anything spreads over them
• Correct drainage at downspouts and grade so water leaves the slab
• Vacuum, not blow, so dust doesn't settle right back onto the prepped surface

The overlay season here, stretch by stretch

Polymer-modified toppings cure by chemistry and by evaporation at once, which makes them fussier about weather than plain concrete. Too hot and the pot life collapses, so you get lap marks where one batch skinned before the next reached it. Too cold and the polymer never coalesces, so the topping stays soft and chalks off in the first freeze.

Mid-May through early October is the window, with May and September the best of it. July and August work if we start at first light and quit before the afternoon storms stack up over the foothills, because a squall on a topping that hasn't set is a redo. Once overnight lows sit below freezing we stop, and winter goes to interior toppings, which run all year.

And the first winter after any overlay: no deicers. Not on the topping, not on the walk that drains onto it.