Frequently Asked Questions
Why columns instead of one big slab?
Columns transfer point loads (deck post, porch roof, structural beam) into the ground. They cost less concrete than a continuous slab, allow grading around them, and resist frost heave better when set below the frost line.
How wide should a concrete column be?
For deck posts: 10-12 inches diameter or 10x10 inch square minimum. For load-bearing columns: 16-24 inches diameter. For commercial buildings, sized by structural engineer based on load tables. Local code typically sets minimum sizes.
Do I need a footing under the column?
Usually yes. A flared footing (wider at the bottom) spreads load over more soil surface and prevents settling. Typical footing: column diameter plus 8-12 inches wider, 8-12 inches deep. Foundation columns often have separate footing pours.
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