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The panels formed by the control joints should be nearly square in shape. Panels with a length/width ratio that exceeds 1½ to 1 are subject to cracking (fig.1). Isolation joints should be planned for areas where the sidewalk will be in contact with the house, the porch, the driveway, edges, stairs, or other structures. It is not necessary to make isolation joints at regular intervals in a straight sidewalk.
Fig. 5. Steps for making a concrete patio:
a) Strip the topsoil.
b) Install the stakes that will hold the forms.
c) Level the subgrade.
d) Install the material that will make the isolation joints with the other structures.
e) Before placing the concrete protect the strips of wood designed to replace the joints with tape.
f) Photo included
g) Compact the concrete and level it.
h) Cover the finished concrete with polyethylene so that it moist cures.
i) The patio is completed.
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