How to Build a Seeded Concrete & Wood Patio Part 2 of 2

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A poured concrete patio divided by wood forms is an attractive alternative to a monolithic concrete slab. In addition to its decorative appearance, this type of surface is easier to create, since the permanent forms divide the concrete pour into four equal sections (or more, as desired).

 

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Overview

A poured concrete patio divided by wood forms is an attractive alternative to a monolithic concrete slab. In addition to its decorative appearance, this type of surface is easier to create, since the permanent forms divide the concrete pour into four equal sections (or more, as desired). Each section can be poured and finished before moving on to the next, or you can complete all the quadrants in a day. If you choose the latter, you must watch the poured quadrants carefully and finish them at the proper time, so you’ll need a couple of helpers. As an optional addition, this project includes steps for seeding the concrete with small stones, or seeding aggregate, introducing color and texture to the concrete surface.
The form lumber used in the project is brown, pressure-treated 2 x 4s, chosen because it’s more attractive than most green-treated wood. If green is all you can find, you can color the wood with a compatible stain. In any case, use high-quality lumber rated for ground contact, and avoid the type with visible incise marks on the surface, a result of certain forms of treatment. For bolder grid lines, you can use 4 x 4 lumber instead of 2 x 4, joining the form pieces with galvanized spikes.
This four-square patio replaced a small, crumbling slab that had become an eyesore. The new patio combines pressure-treated wood with aggregate to create a natural-looking, durable surface.

Construction Details

This divided concrete patio includes 4"-thick concrete slabs reinforced internally with 6 x 6" 10/10 welded wire mesh. The mesh is supported by 2" wire bolsters to keep it near the middle of the slab interior. The patio, including the forms, is built upon a 6" subbase of compacted gravel. When planning your patio project, consult your local building department to learn about the following requirements:
• Zoning restrictions
• Depth of gravel subbase
• Concrete composition
• Slab thickness and slope
• Internal reinforcement (wire mesh, rebar, etc.)
• Moisture barrier under slab
Adapt the project as shown to meet the local requirements.

From: Complete Guide to Patios & Walkways, 978-1-58923-481-9

What You'll Need

Tools:

Rope or hose
Mason’s string
Excavation tools
Hand tamp or plate compactor
Wheelbarrow
Masonry hoe
Magnesium float
Wood concrete float
Concrete edger
Stiff-bristled brush
Paint roller
Stakes
Compactable gravel
Pressure-treated
2 x 4 lumber
6 x 6" [10/10] welded wire mesh
2" wire bolsters
Concrete mix
Seeding aggregate
Polyethylene sheeting
Concrete sealer
Eye and ear protection
Square-nose spade
Scrap 2 x 2 lumber
Galvanized deck screws (21⁄2", 4")
Masking tape
Heavy-duty wire cutters
Hammer
Gloves and particle mask
Circular saw

Materials:

Rope or hose
Mason’s string
Excavation tools
Hand tamp or plate compactor
Wheelbarrow
Masonry hoe
Magnesium float
Wood concrete float
Concrete edger
Stiff-bristled brush
Paint roller
Stakes
Compactable gravel
Pressure-treated
2 x 4 lumber
6 x 6" [10/10] welded wire mesh
2" wire bolsters
Concrete mix
Seeding aggregate
Polyethylene sheeting
Concrete sealer
Eye and ear protection
Square-nose spade
Scrap 2 x 2 lumber
Galvanized deck screws (21⁄2", 4")
Masking tape
Heavy-duty wire cutters
Hammer
Gloves and particle mask
Circular saw

 

Step 1

How to Build a Seeded Concrete & Wood Patio - Step 1

Cut along the edges of the quadrant with a concrete edger, then use a wood float to smooth out any marks left behind by the tool.


Step 2

How to Build a Seeded Concrete & Wood Patio - Step 2

Option: If you have enough help and your project is small enough, you may want to pour remaining quadrants at this time, repeating steps 7 through 11. Be sure to check poured quadrants periodically: if the surface water has evaporated from the concrete, uncover the quadrants and proceed to step 12.


Step 3

How to Build a Seeded Concrete & Wood Patio - Step 3

After all the water has evaporated from the concrete surface, expose the aggregate by misting the surface with water and scrubbing the surface with a stiff-bristled brush. Remove the protective tape from the forms, then recover the quadrants with sheeting and let the concrete cure for one week.


Step 4

How to Build a Seeded Concrete & Wood Patio - Step 4

14. After the concrete has cured, rinse and scrub the aggregate again to clean off any remaining residue. Tip: Use diluted muriatic acid to wash off stubborn concrete residue. Read manufacturer’s instructions for mixing rations and safety precautions.


Step 5

How to Build a Seeded Concrete & Wood Patio - Step 5

After three weeks, seal the patio surface with exposed-aggregate sealer. Reapply sealer periodically as needed, following the manufacturer’s recommendations.


 
 

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