Estimate concrete volume for foundations, piers, and deck posts.
One of the most critical rules in foundation work is digging below the frost line. In cold climates, the ground freezes and expands (heaves). If your footing is sitting in frozen soil, the entire structure will lift and crack.
By placing the footing below the depth that frost penetrates, you ensure it sits on stable, non-moving ground year-round.
Footings must extend below the frost line to prevent shifting during freeze-thaw cycles. In much of the US, this is between 12 and 48 inches. Check your local building codes.
A spread footing is a wider base (usually square or rectangular) that distributes the weight of a column or foundation wall over a larger area of soil.
Yes, steel reinforcement is highly recommended. Concrete has high compression strength but low tensile strength. Rebar prevents the footing from cracking under uneven loads or soil settling.
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