Concrete Contractor in Davenport, WA: Driveways, Patios, Shop Slabs & Foundations

Concrete contractor in Davenport, WA, pouring driveways, patios, shop slabs and foundations to Lincoln County's 30-inch frost depth. Raven Buildings brings the crew that pours our steel building foundations to Davenport, Reardan and the farms around them, with air-entrained mixes, compacted base and footings set below the frost line. Inside city limits we work under the City of Davenport's permits; outside them, under the Lincoln County Building Division.

Concrete work we do around Davenport

• Driveways and approaches: new driveways, replacements and widening, with control joints laid out before the pour
• Patios and walkways: broom-finish and stamped patios, steps and sidewalks
• Shop and machine shed slabs: floors for metal buildings, pole barns and garages, thickened where lifts, trucks or farm equipment will sit
• Foundations and footings: for shops, garages, additions and pre-engineered metal buildings
• Equipment and RV pads: parking for motorhomes, trailers, tractors and grain trucks

First question: city or county?

A Davenport address (99122) can be inside city limits or out in unincorporated Lincoln County, and that decides which office you deal with:

• Inside Davenport city limits: City Hall, 411 Morgan St. (509-725-4352). The City contracts its building services, including plan review, to Northwest Code Professionals
• Outside city limits: the Lincoln County Building Division, at the courthouse at 450 Logan St. in Davenport, which issues permits through its online permitting system
• Road approaches: Lincoln County requires an access permit for an approach onto any county road, and an existing farm approach is re-evaluated when its use changes
• How we check: we pull your parcel number before we quote, so the design and the paperwork match the right office

Lincoln County's numbers for concrete

Lincoln County publishes its own design guidelines, and two of them shape every footing and slab we pour there:

• Frost depth: 30 inches, measured from finished grade to the bottom of the footing. Spokane County designs to 24 inches, so a Spokane footing detail isn't automatically right in Davenport. Our frost depth guide explains why it matters
• Slab rebar: not required, but the County says it is highly recommended. We reinforce shop and garage slabs
• Snow load: 50 psf ground and 40 psf roof minimum, which drives the column loads a shop foundation has to carry

The right mix for freeze-thaw

Washington's residential code (IRC Table R402.2) sets minimum concrete strengths by weathering potential. Where weathering is severe:

• Garage floors, porches, carport slabs and exposed steps: at least 3,500 psi, air-entrained
• Air content: 5 to 7 percent total air. A steel-troweled garage floor can drop to 3 percent air only if the strength goes up to at least 4,000 psi
• Foundation walls and other vertical concrete exposed to the weather: at least 3,000 psi, air-entrained
• Deicers: for driveways and flatwork that see deicing chemicals, the residential concrete code ACI 332-20 calls for 4,500 psi with a maximum water-to-cement ratio of 0.45

We order mixes to match and don't add water on site. Our concrete psi guide goes deeper, and our control joint spacing guide covers how we lay out joints in driveways and shop floors.

Pouring in cold weather

ACI's Guide to Cold Weather Concreting (ACI 306R-16) defines cold weather as when the air temperature has fallen to, or is expected to fall below, 40 degrees F during the protection period. Its key points:

• Protect it until 500 psi: concrete protected from freezing until it reaches at least 500 psi won't be damaged by a single freeze. At 50 degrees F, most well-proportioned mixes get there within 48 hours
• No water curing in the cold: water curing can leave the concrete saturated when protection comes off, which reduces its freeze-thaw resistance
• Cool it down slowly: protection should come off gradually so the surface cools over about 24 hours

In practice that means blankets, heated enclosures or non-chloride accelerators for late-fall pours, and sometimes waiting for spring. See our winter concrete guide and our vapor barrier guide.

What a concrete patio costs

Raven's current pricing for a concrete patio, including site prep and the pour:

• Broom finish: about $12 to $20 per sq ft
• Stamped: about $18 to $30 per sq ft
• What moves the price: the size of the patio and whether a pump truck is needed to reach it

Driveways, shop slabs, equipment pads and foundations are priced per project after a site visit, since base work, thickness, tear-out, access and travel change the cost.

Slab and building from one contractor

Putting up a shop or machine shed? We can pour the footings and floor and erect the building too, with anchor bolts set to the manufacturer's drawings. See our page for metal buildings in Davenport, our PEMB foundation guide and our shop slab thickness guide.

Why Davenport owners call Raven

• Concrete is our core trade: our own crew forms, pours and finishes. See our concrete flatwork services
• We use Lincoln County's numbers, not Spokane's: 30-inch frost, reinforced slabs, 50 psf ground snow
• Eastern Washington experience: we also pour in Medical Lake, Airway Heights and Cheney

Get a Davenport concrete quote

Call 509-350-2016 or request a free quote with your project, rough size and address or parcel number.

Sources

• Patio pricing: Raven Buildings' current rates
• Lincoln County, WA: Design Guidelines
• Lincoln County, WA: Building Division
• Lincoln County, WA: Non-Residential Buildings
• City of Davenport: Building Services
• City of Spokane / Spokane County Joint Policy BUILD-07, Official Frost Depth (PDF)
• 2021 Washington Residential Code, Chapter 4 Foundations (Table R402.2)
• ACI 332-20, Code Requirements for Residential Concrete (preview)
• ACI 306R-16, Guide to Cold Weather Concreting (preview)