Pouring concrete for a patio takes planning, the right tools, and patience—but you can do it yourself if you follow the steps in order and let each stage cure properly
A concrete patio is built in five main stages: preparing the ground, building the frame, mixing and pouring the concrete, smoothing and finishing the surface, and letting it cure. The whole job takes one to two days of active work, then five to seven days of curing time before you can walk on it. Most homeowners rent a concrete mixer and a power trowel rather than buy them, which keeps costs down and means you are not storing equipment afterward.
The most common mistakes are pouring on unprepared ground (which causes cracking and settling), not sloping the surface for drainage (which leads to standing water and ice in winter), and walking on the concrete too early (which damages the finish). This guide walks you through each step so you avoid those problems.
Key Takeaways
- The ground must be compacted, level, and sloped slightly away from your house so water drains off the patio rather than pooling.
- A wooden frame (called a screed board) holds the concrete at the right height and thickness while it sets.
- Concrete is mixed on-site or delivered ready-mixed; for a typical 12-by-16-foot patio, you need about 2 cubic yards.
- The surface is smoothed with a power trowel or hand trowel, then finished with a broom for traction or left smooth depending on your preference.
- Concrete must cure for at least five to seven days before foot traffic; do not seal it or expose it to rain during this time.
Preparing the Ground and Building the Frame
Start by marking out the patio area with string and stakes. Measure the length and width twice to make sure the corners are square—use the 3-4-5 method: measure 3 feet along one edge, 4 feet along the adjacent edge, and the diagonal should measure 5 feet. If it does not, adjust the stakes until it does.
Dig out the area to a depth of 4 to 6 inches, removing grass, roots, and loose soil. Compact the ground firmly with a hand tamper or a rented plate compactor. This step is critical: loose soil underneath will settle unevenly and crack the concrete. Compact in overlapping passes until the ground feels solid and does not give when you step on it.
Slope the ground slightly away from your house—about 1/8 inch per foot of width. This means a 12-foot-wide patio should slope down 1.5 inches from the house side to the far side. Use a long level and a measuring tape to check the slope as you work. Add or remove soil as needed to get it right.
Build a wooden frame (called a screed board) around the perimeter using 2-by-4 lumber. Nail the boards to stakes driven into the ground outside the frame. The top of the boards should be at the height you want the finished concrete to be. Check that the frame is level side to side and slopes away from the house front to back. This frame holds the concrete at the right thickness while it cures.
Calculating and Ordering Concrete
Measure the length, width, and depth of your patio to calculate how much concrete you need. Multiply length times width times depth (all in feet), then divide by 27 to get cubic yards. For example, a 12-by-16-foot patio that is 4 inches deep is 12 × 16 × 0.33 = 63.36 cubic feet, which is about 2.35 cubic yards.
You have two options: rent a concrete mixer and buy bags of dry concrete mix, or order ready-mix concrete delivered by truck. For a patio smaller than 100 square feet, bags are often cheaper and easier. For anything larger, ready-mix is faster and produces a more consistent result. If you order ready-mix, call ahead to confirm the truck can reach your site and that you have a clear path for the chute.
If you are mixing bags, plan on one 80-pound bag per 0.6 cubic feet. A 2.35 cubic yard patio needs about 105 bags. Rent a mixer for the day—most rental shops charge $40 to $60. If you order ready-mix, the truck arrives with the concrete already mixed and ready to pour. Delivery fees vary by region, but expect to pay $150 to $300 for a short-distance delivery.
Pouring and Spreading the Concrete
Have all your tools and helpers ready before the concrete arrives or before you start mixing. You will need a wheelbarrow (if using bags), a shovel, a screed board (a straight 2-by-4 longer than your patio width), and a concrete rake. Work quickly once the concrete is mixed—it begins to set within 90 minutes in warm weather.
Pour the concrete into the frame in sections, starting at the far end and working toward the house. Spread it roughly with a shovel, filling the frame so the concrete is slightly higher than the top of the wooden frame. Do not worry about smoothness yet—you are just filling the space.
Use a screed board (a straight 2-by-4 longer than the patio width) to level the concrete. Place it across the top of the wooden frame and drag it toward you in a sawing motion, moving it side to side as you go. This removes excess concrete and fills low spots. Make two or three passes until the surface is level with the frame and smooth. Concrete that is too high will be wasted; too low will be weak.
After screeding, tap the wooden frame with a hammer to release air bubbles trapped in the concrete. This step prevents small holes and weak spots in the finished surface. Tap all four sides of the frame for about 30 seconds.
Smoothing and Finishing the Surface
Let the concrete sit for 15 to 30 minutes after screeding. It should be firm enough to walk on without sinking but still workable. Test it by pressing your thumb into the surface—if it leaves a mark less than 1/4 inch deep, you are ready to finish.
Use a power trowel (rented for $30 to $50 per day) or a hand trowel to smooth the surface. A power trowel is faster and produces a more even finish, especially on large patios. Move it in overlapping passes, keeping the blade nearly flat against the concrete. A hand trowel works for small areas—use long, smooth strokes and keep the blade at a slight angle so it does not dig in.
For a non-slip finish, drag a stiff broom across the surface before it fully hardens. This creates a textured surface that is safer when wet. Broom the concrete in one direction for a uniform look. If you prefer a smooth, polished finish, skip the broom and do a final pass with the trowel instead.
Once you are happy with the finish, remove the wooden frame. Do this while the concrete is still slightly soft—usually 24 hours after pouring. Pry the boards away gently and fill any gaps left behind with a concrete patching compound.
Curing and Protecting Your Patio
Curing is the process of concrete hardening and gaining strength. It takes at least five to seven days, and the concrete reaches full strength after 28 days. During the first week, keep the patio dry and protect it from foot traffic. Cover it with plastic sheeting if rain is forecast, and do not let anyone walk on it.
Do not seal the concrete during the first week. Sealing too early traps moisture inside and weakens the surface. Wait at least seven days, preferably 14, before explore a sealer. When you do seal, use a concrete sealer rated for patios—it protects against stains, water damage, and UV fading.
In hot weather (above 80 degrees Fahrenheit), mist the concrete lightly with water once a day for the first three days. This keeps it from drying too fast, which causes cracking. Do not spray it hard or let water pool on the surface—just a light mist.
Common Mistakes and How to Avoid Them
The most common mistake is not compacting the ground properly. Loose soil settles unevenly, causing the concrete to crack and settle. Spend time on this step—it is the foundation of a long-lasting patio. Compact in overlapping passes until the ground is solid.
Another frequent error is pouring concrete on a rainy day or when rain is forecast within 24 hours. Water on the surface during curing weakens the concrete and causes scaling (flaking of the top layer). Check the forecast before you pour, and cover the patio if unexpected rain arrives.
Walking on the concrete too early is tempting but damaging. Even if the surface feels hard after a day or two, the interior is still curing. Wait at least five to seven days before allowing foot traffic, and wait 28 days before placing heavy objects like planters or furniture on it.
Forgetting to slope the surface for drainage causes water to pool on the patio, leading to ice in winter and algae growth in summer. A slope of 1/8 inch per foot is barely noticeable but makes a big difference. Check it with a level as you prepare the ground.
Tools and Materials You Will Need
| Item | Purpose | Rent or Buy |
|---|---|---|
| 2-by-4 lumber | Build the frame that holds concrete at the right height | Buy (reusable) |
| Stakes and nails | find the frame to the ground | Buy |
| Concrete mix (bags or ready-mix) | The material for the patio | Buy |
| Concrete mixer | Mix dry concrete with water (if using bags) | Rent |
| Shovel and wheelbarrow | Move and spread concrete | Buy or borrow |
| Screed board (2-by-4) | Level the concrete surface | Buy (reusable) |
| Power trowel or hand trowel | Smooth the surface | Rent or buy |
| Broom (stiff bristles) | Create a non-slip texture | Buy |
| Level and measuring tape | Check slope and dimensions | Buy or borrow |
| Plate compactor | Compact the ground before pouring | Rent |
Frequently Asked Questions
How thick should a concrete patio be?
A patio should be 4 inches thick for residential use. This thickness is strong enough for foot traffic and light furniture but is not so thick that you waste concrete. If you plan to park a car on part of the patio, increase the thickness to 5 or 6 inches in that area.
Can I pour concrete in cold weather?
Concrete can be poured when the temperature is above 50 degrees Fahrenheit, but it cures much more slowly in cold weather. Below 40 degrees, the concrete may not cure properly and can be damaged by freeze-thaw cycles. Wait for warmer weather if possible, or use a concrete additive designed for cold-weather pouring.
What should I do if the concrete cracks after it cures?
Small hairline cracks (less than 1/8 inch wide) are normal and do not affect the patio's strength. Fill them with a concrete crack filler or caulk. Larger cracks may indicate a problem with the ground preparation or the concrete mix. If cracks are wider than 1/4 inch or keep growing, consult a concrete contractor.
Do I need to seal my concrete patio?
Sealing is not required but is recommended. A sealer protects the concrete from stains, water damage, and UV fading, and makes it easier to clean. Wait at least 14 days after pouring before sealing. Reapply sealer every two to three years, depending on the product and how much traffic the patio gets.
How long before I can put furniture on the patio?
Wait at least seven days before placing light furniture on the patio, and 28 days before placing heavy objects like grills or planters. The concrete reaches about 70 percent of its full strength after seven days and full strength after 28 days. Placing weight on it too early can cause permanent indentations or cracking.