The question of structural frame material for outdoor kitchens is one that most homeowners don’t think to ask — but it’s one of the most important quality indicators in any build. In Oklahoma’s climate, concrete masonry unit (CMU) construction — commonly called concrete block — is the superior choice for outdoor kitchen frames, and here’s why.
What Is CMU Construction for Outdoor Kitchens?
CMU (concrete masonry unit) outdoor kitchen construction uses standard 8″x8″x16″ hollow concrete blocks as the structural frame of the kitchen. The blocks are stacked in mortar, the cavities are typically filled with rebar and grout for additional reinforcement, and the finished block structure provides the substrate for exterior stone veneer or stucco finish and the support platform for countertops and appliances.
This is the same basic construction method used for residential and commercial masonry walls — proven, code-standard, and designed for indefinite outdoor exposure.
Why CMU Outperforms Steel Stud and Wood Frames in Oklahoma
Against wood framing: Wood outdoor kitchen frames in Oklahoma’s climate are simply wrong for the environment. Moisture infiltration through Oklahoma’s spring rains, summer humidity, and freeze-thaw cycles causes wood frames to rot, swell, and eventually fail — taking the finish work with them. We’ve seen wood-framed outdoor kitchens in Broken Arrow that required significant structural repair within 3–5 years. CMU doesn’t rot. Period.
Against steel stud framing: Steel stud frames are better than wood for outdoor kitchens, but they introduce complications that CMU avoids:
- Steel studs require exterior-rated cement board sheathing and a comprehensive waterproofing membrane — installed correctly, this works well; installed with gaps or improper overlap, moisture infiltrates and corrodes the steel fasteners and eventually the frame
- Steel frames are less thermally stable than concrete block — they expand and contract more with Oklahoma’s temperature swings, which can cause the finish materials bonded to them to crack over time
- Steel stud construction requires more precise workmanship to achieve equivalent durability to CMU
CMU Advantages for Oklahoma Outdoor Kitchens
- Zero moisture sensitivity: Concrete block doesn’t absorb water in a way that causes structural degradation. Oklahoma rain, snow, and humidity have no effect on a properly built CMU structure.
- Thermal mass: Concrete block’s thermal mass stabilizes temperature fluctuations — the structure doesn’t expand and contract dramatically with Oklahoma’s temperature swings, which means stone veneer and stucco finish materials stay bonded without cracking.
- Fire resistance: Critical for outdoor kitchens positioned near grills, smokers, and fire features. Concrete block is non-combustible.
- Longevity: CMU outdoor kitchens built correctly have a practical lifespan measured in decades — 30, 50, or more years without structural issues. The finish materials will need periodic maintenance; the frame won’t.
VistaScapes Builds CMU Outdoor Kitchens in Broken Arrow
CMU is VistaScapes’ preferred structural method for outdoor kitchen construction in the Broken Arrow and Tulsa market. We won’t compromise structural quality to hit a lower bid number. Call 918-779-1317 to discuss your outdoor kitchen build.
