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Home/Excavation/Slab Prep

Slab prep in Ellensburg and Kittitas County

The grade, the gravel and the compaction under a slab. Get this wrong and the concrete cracks no matter who pours it or how good the finish looks on day one.

Call (435) 660-6256
  • slab prep Ellensburg WA
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Base rock compacted and the mat tied out before concrete
Base rock compacted and the mat tied out before concrete

Slab prep is the least visible work we do and the easiest to under-build, because once the concrete is down nobody can audit it. That is exactly why it is worth doing properly.

The work is: strip every bit of organic material, cut to the right elevation so the slab ends up at the thickness it is supposed to be, import structural fill where the native ground is not good enough, compact in lifts with a plate or a roller depending on the depth, then bring base rock up and screed it flat. Flat matters. Every low spot in the base is extra concrete you pay for, and every high spot is a thin slab waiting to crack.

Then the parts people forget: sleeves and stub-ups for plumbing and conduit set before anything is compacted over them, vapor barrier under heated space, perimeter thickening at the edges and anywhere a post or a rack lands, and reinforcement set on chairs so it ends up in the middle of the slab rather than lying on the dirt.

We do this under our own pours and we do it as a standalone for other contractors. If you have a concrete crew you like and you want the base right before they show up, that is a normal job for us.

Slab Prep, on real jobs

Forms set and the base cut flat ahead of a pour
Forms set and the base cut flat ahead of a pour
Poured slab with the gravel approach built up to meet it
Poured slab with the gravel approach built up to meet it
Wall steel tied and braced against the cut
Wall steel tied and braced against the cut
Shop slab poured inside the timber frame
Shop slab poured inside the timber frame
Pier pads set and the trench rocked for drainage
Pier pads set and the trench rocked for drainage

Reviews

Take a look at what your neighbors are saying about us.

  • Chad was incredibly professional, knowledgeable, and accommodating. We had a sports court poured last summer and plan to hire him again next spring for a retaining wall and fire pit patio.

    Kimberly McNutt
See more reviews

Areas We Serve

  • Ellensburg, WA
  • Yakima, WA
  • Wenatchee, WA
  • Sandpoint, ID
  • Cle Elum, WA

Questions we get on slab prep

How much base rock goes under a slab?

It depends on the native soil and the load, not on a number somebody repeats. On good gravel subgrade it is less than on silt that holds water. We will tell you what is under your site before we quote the depth.

Will you prep a slab for another concrete crew?

Yes, that is routine. We will hit their elevations, set their sleeves and leave the base compacted and screeded flat. Give us their thickness and reinforcement plan and we will build to it.

Usually booked with this

FlatworkShop slabs, equipment pads, sidewalks, patios and aprons.Footers & FoundationsFootings, stem walls and full foundations for homes, shops and pole barns.Site PrepClearing, stripping, cutting and filling a raw lot into a building pad that drains.

Need slab prep? Tell us about the site.

Free estimates across Kittitas County and well beyond it. Call or send the details and we will get back to you.

Call (435) 660-6256