How to Pour a Concrete Patio — Step by Step

Planning & Sizing

For anything over 1 cubic yard, order ready-mix. Mixing 50+ bags by hand is brutal, inconsistent, and actually costs more per cubic yard than delivery. Calculate your exact volume with our Concrete Calculator. See our concrete coverage table for a quick thickness-to-yards reference. See our concrete patio cost guide for full pricing breakdown.

Materials List (10×12 Patio, 4" Thick)

Tools Needed

Shovel, wheelbarrow, tamper or plate compactor (rental ~$50/day), level (4 ft), string line, stakes, screed board (straight 2×4 longer than the slab width), bull float or darby, magnesium hand float, steel trowel, edging tool, broom (for broom finish), concrete mixer (if using bags, rental ~$50/day), tape measure, chalk line. Nice to have: knee boards, rubber boots.

Step-by-Step

1. 1

   Layout and excavation

   (2–4 hours)

   Mark the patio outline with stakes and string. Make it 2" larger than the finished size on each side (the forms sit inside). Excavate to a depth of 8 inches below the desired finished surface (4" gravel base + 4" concrete). Slope the excavation away from the house at ⅛" per foot for drainage — a 10-ft deep patio should be 1¼" lower at the far edge.

2. 2

   Install and compact the gravel base

   (1–2 hours)

   Fill the excavated area with 4 inches of ¾" crushed gravel. Compact in 2" lifts using a plate compactor or hand tamper. The base must be uniformly compacted and level (with the drainage slope). This prevents settling and cracking later. Do not skip this step — pouring directly on dirt leads to cracking as the soil shifts.

3. 3

   Build and set forms

   (1–2 hours)

   Build a rectangular form from 2×4 lumber. Drive stakes every 3–4 ft along the outside of the forms and screw through the stakes into the forms. The top of the forms should be at the exact finished height of the concrete. Check level (with drainage slope) across the forms in both directions. Check square by measuring diagonals — they must be equal. Apply form release oil so the forms pull off cleanly later.

4. 4

   Place reinforcement

   (30 min)

   Lay welded wire mesh on top of the gravel, supported on wire chairs or small stones so it sits in the middle of the slab (about 2" up from the gravel). Overlap mesh sheets by 6". Alternatively, add fiber mesh to the concrete mix — it reinforces against surface cracking but doesn't replace wire mesh for structural reinforcement. For a basic patio, either method works.

5. 5

   Place expansion joints

   (10 min)

   Install expansion joint material (asphalt-impregnated fiberboard) where the patio meets the house foundation or any existing concrete. This prevents the patio from bonding to the house and cracking as it moves independently. Press the joint material tight against the house wall.

6. 6

   Order and pour the concrete

   (1–3 hours)

   For ready-mix: schedule delivery, have 2+ people ready to work immediately when the truck arrives. Pour into the forms starting at the far end and working toward the truck. Spread with shovels and rakes to fill evenly. For bag mix: mix in batches in a mixer and pour continuously. Either way, the entire slab should be poured in one session — you cannot pour half today and half tomorrow.

7. 7

   Screed the surface

   (20–30 min)

   Rest a straight 2×4 (the screed board) across the tops of the forms. Pull it toward you in a sawing motion while moving it forward. This levels the concrete flush with the top of the forms. Fill any low spots with additional concrete and screed again. The surface doesn't need to be perfect yet — just roughly flat and at the right height.

8. 8

   Bull float

   (15 min)

   Push a bull float or darby across the surface in overlapping arcs. This pushes gravel below the surface and brings the cream (cement paste) to the top. Don't overwork it — 2 or 3 passes is enough. Overworking brings too much water to the surface and weakens the finish.

9. 9

   Wait for bleed water to evaporate

   (30 min–2 hours)

   Concrete releases water as it begins to set. You'll see a sheen of water on the surface. Do NOT start finishing until this bleed water disappears. Finishing while water is present traps it in the surface layer, causing scaling and flaking. Wait until the sheen is gone and the concrete holds a footprint about ¼" deep.

10. 10

    Edge and joint

    (20 min)

    Run an edging tool along all form edges to create a rounded edge (prevents chipping). Cut control joints with a groover every 8–10 ft in both directions. Control joints give the concrete a predetermined place to crack — without them, random cracks will appear.

11. 11

    Apply final finish

    (20 min)

    For a broom finish (recommended for outdoor patios — provides traction): drag a stiff broom across the surface in straight, parallel lines perpendicular to the drainage slope. Pull the broom toward you in one smooth motion. For a smooth trowel finish: use a steel trowel in sweeping arcs (but this gets very slippery when wet — not recommended for outdoor patios).

12. 12

    Cure the concrete

    (7 days)

    This is the most overlooked step. Concrete reaches its strength through hydration — the chemical reaction of cement and water. If it dries out too fast, it will be weak and crack. Immediately after finishing, cover the slab with plastic sheeting or spray with a liquid curing compound. Keep it moist for at least 7 days. No foot traffic for 24 hours. No heavy items for 7 days. No vehicle traffic for 28 days.

Common Mistakes

• Skipping the gravel base — soil settles unevenly and the slab cracks
• Pouring too thick or too thin — inconsistent thickness leads to differential curing and cracking
• Finishing too early (before bleed water evaporates) — causes surface scaling
• Finishing too late (concrete is too stiff) — you can't smooth it and the finish looks rough
• Not cutting control joints — the slab will crack randomly instead of at the joints
• Removing forms too early — wait at least 24 hours, preferably 48
• Not curing — letting the slab dry in the sun dramatically reduces strength and durability

When to DIY vs Hire a Pro

DIY is very doable for small slabs under 100 sq ft using bagged concrete. For larger pours (over 1.5 yd³) that require a ready-mix truck, it becomes a race against time — you have about 90 minutes before the concrete starts to set, and every step from pouring to finishing must happen quickly and correctly. If you haven't poured before, having an experienced helper (even if you're not hiring a full crew) makes a huge difference. Finishing is the hardest skill — it looks easy but requires timing and practice.

See our concrete patio cost guide for full pricing breakdown by size and finish type.

Frequently Asked Questions