Sebastian concrete, start to finish
Sebastian's paperwork goes back further than its street grid. The city was incorporated in 1924, yet the community most residents know today took shape decades later: in the late 1950s, General Development Corporation purchased the land from Miami's Mackle family and started building the planned community that grew into the present city. Whatever the age of a house, the concrete around it follows the same basic recipe as any slab poured anywhere: a firm base, a sound mix, steel or fibers where they belong, joints in the right places and a patient cure. This page goes through each of those steps with the local weather in mind, then covers paperwork and quotes.
Where the weather numbers come from
NOAA's engineering weather data has no station inside Sebastian. The closest is at Vero Beach, elevation 26 feet, roughly 11 miles to the south. Every figure on this page is that station's, not a reading taken in Sebastian, but it gives a fair regional picture of what a new slab will face.
Hot afternoons and curing
For Vero Beach, NOAA sets the 1% summer design temperature at 91°F, with a mean coincident wet-bulb temperature of 78°F. Heat speeds up how quickly fresh concrete stiffens, and sun plus a breeze can pull water out of the top layer before the slab below has gained strength. The results are plastic shrinkage cracks, a soft surface that dusts, and edges that chip early.
Questions worth asking any contractor:
- What time of day do they start a summer pour, and how big a crew will be on site to place and finish it quickly?
- Will the base be dampened before the truck arrives, so dry fill doesn't soak water out of the mix?
- How will the slab be cured: wet curing with hoses and covers, a sprayed curing compound, or both? For how many days?
- What is their rule about adding water at the truck? Extra water makes the mix easier to spread and weaker once it hardens.
Mild winters, still a few cold nights
The same Vero Beach sheet lists a 99% winter design temperature of 42°F and about 1 freeze-thaw cycle in an average year. Frozen ground isn't what sizes footings or edges here, and air-entrained mixes built for repeated freezing are less of a talking point than they are up north. Cool nights still slow the set. If a pour is scheduled after a cold front, ask whether the finishing schedule changes and how long the forms stay on.
Rain, runoff and slope
NOAA lists a 100-year rainfall rate of 4.5 inches per hour at Vero Beach. When rain falls that hard, a driveway or patio acts like a roof laid flat on the ground, and every gallon it sheds goes somewhere. Before forms go in, ask:
- which way each section will slope, and by how much per foot;
- where the water ends up: the street, a swale, a lawn area or a drain;
- whether any downspout needs to be extended or piped beneath the new slab;
- how the edge where the slab meets the house will be sealed so water drains away instead of toward the foundation.
Also ask what happens if a storm blows in during the pour or the first hours after finishing, and how the crew will cover fresh concrete.
Wind and what sits on the slab
The Vero Beach data gives a 50-year basic wind speed of 140 mph, measured as a 3-second gust at 33 feet. A slab doesn't blow away, but what is bolted to it can pull hard on its anchors: a shed, a carport, a pergola, an equipment pad. If anything will be fastened to your new concrete, ask how thick the slab will be at those points, which anchors will be used, and whether the item's maker or an engineer has its own requirements for the slab.
The ground under the slab
Most cracked and sunken slabs failed from below. Ask what the crew will dig out, what fill goes in, how deep the base will be and how it will be compacted, in layers or all at once. Ask how they deal with roots, buried debris and soft spots they find once excavation starts, and whether that work is priced up front or billed as an extra.
Reinforcement and control joints
Ask whether the plan uses wire mesh, rebar, synthetic fibers or a mix, and how steel will be held up at mid-depth instead of resting on the dirt. Then ask for a joint layout: where the control joints go, how deep they'll be cut, and when. Joints don't prevent cracks. They give cracks a straight, tidy place to happen.
Checking a Florida contractor
Florida contractors hold one of two kinds of credential. A state certificate of competency carries a license number that starts with C and allows contracting anywhere in Florida. A registration starts with R and covers only the local jurisdictions where the contractor met competency requirements. Ask which license the contractor holds and get the number in writing, then look the contractor up on DBPR's license search at myfloridalicense.com and check that the license type matches the work.
Ask which permits your job needs and who pulls them, and whether permit fees and inspections are part of the price. Ask for proof of liability coverage and workers' compensation, too.
Putting quotes side by side
Two totals only compare if they describe the same job. Ask each contractor to spell out:
- area, thickness and finish for every section;
- removal and haul-off of any old concrete;
- excavation, fill and compaction;
- reinforcement and the joint plan;
- slope and drainage work, including downspouts;
- the curing method and any sealer;
- permits, inspections and cleanup;
- the written warranty and what it excludes.
A low number that leaves out base work or drainage hasn't saved you anything. It has just moved those costs down the road.