pergola slab design

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Old 11-14-13, 10:50 AM
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Question pergola slab design

My contractor indicates a 4 inch thick reinforced concrete slab will suffice for a standalone 16 x 18 ft pergola in Argyle Texas. My concern is the structural stability. Columns are to be 8 x 8, beams 6 x 8. High wind conditions are typical for this area. Should I insist on concrete footing below the slab. Your advice will be most welcomed. Thanks Ed
 
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Old 11-14-13, 11:50 AM
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I agree with you, you should have footings.
 
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Old 11-14-13, 01:35 PM
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Can't see how the slab would not crack under this, I would want footings as well.
 
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Old 11-15-13, 08:44 PM
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Entire perimeter of slab should be thickened to 8" or even a foot. Reinforcement needs to be done correctly, meaning not just mesh placed on the grade and concrete poured on top of it. I'd use 2 continuous, longitudinal rebar (top and bottom) in the thickened footing, with mesh looped around them from the interior of the slab. And plenty of control joints.
 
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