House Slabs
The house slab is the single most important structural element on any residential property in South Florida — the foundation that carries every wall, every roof truss, every hurricane load, and every piece of furniture in the home for its entire service life. A house slab that is not properly engineered, properly poured, or properly cured becomes a long-term problem that reveals itself through cracked tile floors, binding doors, separated drywall joints and, in extreme cases, structural failure. Our standard new-construction monolithic house slab is 4 inches thick through the interior, 12 to 16 inches thick at the thickened perimeter edge (the integrated footing), with thickened grade beams 12 inches wide and 10 to 14 inches deep beneath interior load-bearing walls. Concrete is 3,000 PSI minimum — most of our residential work is specified at 3,000 to 3,500 PSI. Reinforcement is Grade 60 rebar at the perimeter and grade beams (#5 bar typical), with 6x6 W1.4xW1.4 welded wire mesh or macro-synthetic fiber through the interior slab field. Under the slab, we install a 10-mil polyethylene vapor barrier over the compacted sub-base, which is critical in South Florida's humid climate to prevent moisture vapor transmission that can destroy flooring from below. Termite pre-treatment is mandatory under Florida Building Code R318 for any slab pour on wood-framed residential construction. The pre-treatment is applied to the soil and sub-base before the vapor barrier is placed, and the pre-treatment company provides a certificate of application that becomes part of the permit package. We coordinate pre-treatment timing with the pest control trade so that pre-treatment, vapor barrier, reinforcement and pour all happen on schedule without delays. Every house slab pour is inspected by the local building department before concrete is placed — the pre-pour inspection is not optional and cannot be skipped.
Common Applications
- New-construction single-family homes on lots in Coral Springs, Davie, Parkland
- Custom home slabs on large lots in Coral Gables, Pinecrest, Boca Raton
- Townhome and duplex slabs in multifamily residential developments
- Slab replacement on older homes where foundation failure has occurred
- Addition slabs tied into existing home foundations
- Accessory dwelling unit (ADU) and in-law suite slabs
- Pool house and detached garage slabs
- Monolithic slabs with integrated thickened footings and grade beams
Technical Specs & Details
- 4 inches interior slab thickness, 12–16 inches thickened edge / perimeter footing
- 3,000 PSI standard concrete strength; 3,500 PSI in coastal exposure zones
- Grade 60 #5 rebar at perimeter footing and interior grade beams
- 6x6 W1.4xW1.4 welded wire mesh or fiber reinforcement in slab field
- 10-mil polyethylene vapor barrier over compacted sub-base
- FBC-required termite pre-treatment applied before vapor barrier placement
- Sub-base compacted to 95% modified Proctor density
- Control joints saw-cut at 20x20 ft maximum spacing within 6–12 hours of pour