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Sakrete Home Additions & ADU: The San Antonio Owner's Guide
Sakrete is concrete and mortar products, not a manufactured home-addition or ADU kit. If you're here because your Sakrete-based foundation slab, stem wall, or concrete stem-wall anchor system failed or is failing, you're in the right place. Sawyer Remodel San Antonio installs and repairs additions and ADUs built on Sakrete concrete, with full home addition projects running $45,000 – $130,000 and ADU construction running $90,000 – $220,000 in San Antonio. Most owners discover the problem through a crack that wasn't there last spring, a door that started sticking, or moisture wicking up through the slab edge.
We're an independent contractor, not affiliated with Sakrete. But we pour and repair Sakrete mixes every month, so we know exactly how it behaves in San Antonio's clay soil and freeze-thaw cycles.
Which Sakrete Mixes This Applies To
Not all Sakrete products are the same, and that matters when something fails. The most common mixes we see under San Antonio additions and ADUs are Sakrete High-Strength Concrete Mix (4000 PSI) for slabs and footings, Sakrete Maximizer (5000 PSI) where an engineer specified higher compressive strength, and Sakrete Sand Mix for topping and leveling beds. Each has different aggregate size, cure time, and load tolerance. If your slab shows signs of surface spalling or edge crumbling, the mix type affects whether we can do a structural overlay or whether the pour needs cutting out and redoing.
The compatibility gotcha most owners miss: Sakrete Maximizer sets faster than High-Strength Mix. If a previous contractor poured a footing with Maximizer in August heat in San Antonio and didn't keep the forms wet, you can get cold joints and a weakened cold pour line. We identify the mix by looking at the aggregate size in the broken edge and by checking any remaining bags or receipts. If there's no record, we core a sample. For the homeowner, aftermarket repair mortars are fine for surface patches, but the structural repair (rebar tie-in, dowel epoxy, recasting a section) needs to match the original mix's compressive strength or better.
Styles & brands we work with
Signs Your Sakrete Concrete Foundation or Slab Is Failing
- Stair-step cracks in stem walls or foundation edges. This isn't cosmetic. In San Antonio's expansive clay, seasonal moisture swings push and pull on concrete; stair-step cracking means the slab is moving unevenly. It typically appears within the first 3 to 5 years if the pour lacked proper steel.
- Doors and windows that stick seasonally. If an interior door binds every summer or swings open by itself in winter, the slab or perimeter foundation is shifting. Sakrete mix itself isn't the culprit; undersized footings for the soil type usually are.
- White chalky dust (efflorescence) or dark moisture staining on the slab edge. Water is moving through the concrete. In a San Antonio addition, this often means the vapor barrier was skipped or punctured before the pour. The fix is drainage and sealing, not just painting over it.
- Hollow-sounding spots when you tap the slab surface. That's delamination, where the top surface separated from the body of the concrete. Common with a too-wet pour or over-troweled finish. Small areas can be patched; large delamination means slab replacement.
- Crumbling or sandy surface around anchor bolts or sill plates. When the concrete surface turns to sand under the sill plate, the bolted connection to the framing is failing. This is a structural safety issue, not a maintenance item.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What's Included
Concrete foundation or slab repair on a Sakrete-based San Antonio addition runs $4,500 – $12,000 depending on linear feet, depth, and access. That covers cutting out the failed section, doweling in rebar, recasting with a matching or higher PSI mix, and a 7-day wet cure inspection. A full home addition, where we're pouring new Sakrete footings, framing, and finishing the space, runs $45,000 – $130,000. ADU construction runs $90,000 – $220,000.
What drives the range: soil test results, whether piers or grade beams are required, the cost to remove and replace failed concrete, and San Antonio permitting fees. Every quote includes our written price before any work starts, a line-item breakdown, and the 365-Day Done Right Promise backing the work. If it's not done right, we make it right.
DIY or Call Us?
You can safely inspect your own slab: look for new cracks, tap for hollow sounds, and check if doors still close square. You can also seal hairline cracks with a quality concrete caulk to slow water intrusion. What you shouldn't DIY: any repair that involves cutting concrete, exposing rebar, lifting a settled slab, or touching the connection where your wall framing meets the foundation. That work involves heavy equipment, structural load paths, and a building permit. A failed foundation repair is worse than no repair at all, and it's not something you can undo with a bag of patch mix from the hardware store.
If you see structural cracking, door binding, or crumbling concrete, call us at (432) 547-6806. We'll send someone who knows Sakrete and San Antonio soil, and you'll get a written price before anything gets cut.
FAQs
A properly poured Sakrete slab with correct steel reinforcement and site drainage should last 50+ years as a structural slab. Most failures we see in San Antonio are from missing vapor barriers, undersized footings for expansive clay, or poor curing, not from the Sakrete mix itself. If your slab is failing before year 10, the original installation was likely the problem. Call (432) 547-6806 and we'll tell you plainly what we're looking at.
Most hairline and shrinkage cracks can be routed and sealed, which we do regularly. Structural cracks (wider than 1/8 inch, offset, or growing) usually require epoxy injection, carbon fiber staples, or section replacement. The repair choice depends on whether the slab is still moving. We'll check with a crack gauge and soil assessment before recommending anything. Estimates are free.
A typical section replacement on a San Antonio addition takes 5 to 7 days including concrete cutting, rebar work, pour, and cure time before load. A full slab replacement for an ADU can run 10 to 14 days. Weather delays happen, but we give you a written schedule and photo updates before and after the work. Call (432) 547-6806 for a timeline specific to your job.
Yes. Our trucks carry Sakrete High-Strength Mix, Maximizer, and matching repair mortars, plus carbon fiber staples, epoxy injection, and dowel systems for structural tie-ins. We also carry parts and materials for KraftMaid, Cambria, and Silestone projects since we install those brands. If you're in the middle of a Sakrete failure, we're usually on-site with the right mix the same day we quote it.
Written by Luca Romano, Owner, Sawyer Remodel San Antonio at Sawyer Remodel San Antonio, serving San Antonio and nearby areas.
