Removal and preparation: Remove approximately 1,800 sq. ft. of existing concrete, prepare the subgrade, and install a moisture barrier. Preserve existing canopy footers.
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What the job is
Concrete: Install a minimum 4-inch-thick, 3,000 PSI slab reinforced with #3 rebar at 16-inch centers or heavy-duty welded wire mesh.
Grading and finish: Slope the patio away from the structure at 1/8–1/4 inch per foot, provide control joints at maximum 8–10-foot spacing, and apply a slip-resistant broom finish.
Drainage: Connect existing roof downspouts to sealed, heavy-duty smooth-wall underground piping, such as Schedule 40 PVC, with minimum 4-inch lines and a 6-inch main drain. Discharge to daylight at a lower yard elevation with at least 1/8 inch per foot slope.
Testing: Water-test drain lines and allow inspection of the buried pipe layout before pouring concrete.
Schedule: Begin within 10 days of authorization and complete within the following 90 days.