Proper Preparation
Concrete Installation Built Around Proper Site Preparation
The performance of any concrete surface depends heavily on what happens before concrete is placed. Subgrade condition, base material, compaction, drainage, and formwork accuracy all directly influence how the finished concrete performs over time.
In Los Angeles, site conditions vary significantly from property to property. Soil type, existing hardscape, drainage patterns, slope, and access constraints all factor into how preparation needs to be handled. A driveway on a flat lot in the San Fernando Valley requires different preparation than a hillside walkway in the Hollywood Hills or a commercial slab near Downtown.
Evaluating Existing Site Conditions
Before work begins, the existing conditions are evaluated. This includes the soil, drainage flow, existing concrete that may need removal, tree roots near the work area, and access for equipment and material delivery. This evaluation helps determine the appropriate preparation and construction approach.
Preparing the Subgrade and Base
The subgrade — the native soil beneath the concrete — must be stable and properly graded. Where needed, unsuitable material is removed and replaced with compactable base material. Compaction reduces the risk of settlement after the concrete is placed. The base layer provides a consistent, load-bearing surface for the concrete slab.
Formwork and Layout
Forms define the shape, grade, and thickness of the concrete. Accurate form placement ensures the slab meets the planned dimensions, maintains proper drainage slope, and aligns with existing structures, walls, and property features. Forms must be secure enough to withstand the weight and pressure of fresh concrete during placement.
Reinforcement Where Required
Depending on the project, reinforcement such as rebar or welded wire may be placed within the forms. The type, size, and spacing of reinforcement depend on the intended use, anticipated loads, site conditions, and applicable project specifications. Foundation and structural concrete projects may require specific reinforcement based on approved engineering plans.
Concrete Placement and Finishing
Concrete is placed, consolidated, screeded to grade, and then finished according to the selected surface treatment. Broom finish provides a textured, slip-resistant surface commonly used for driveways and sidewalks. Smooth finishes and decorative treatments may be available depending on the project scope. Finishing must be completed within the concrete's working window — a process that requires experience, especially in Los Angeles heat, where surface moisture can evaporate rapidly.
Joint Planning and Curing
Control joints are placed at planned intervals to help manage shrinkage cracking. The spacing, depth, and pattern of control joints are determined by slab thickness, layout, and intended use. After finishing, concrete must cure properly. Premature drying — particularly under direct Southern California sun — can weaken the surface and increase the likelihood of cracking, scaling, or surface wear.