Do bored piers need steel reinforcement inside them?

Yes, typically — a steel reinforcement cage is placed inside the drilled hole before concrete is poured, giving the pier genuine tensile strength beyond what plain concrete alone would provide.

The specific reinforcement design — bar size, cage configuration — is calculated by your engineer based on the loads your specific piers need to carry, not a generic standard applied regardless of your project.

Correctly positioning this reinforcement cage within the pier, with appropriate cover, is part of what pre-pour inspection confirms before concrete is poured, given it becomes inaccessible once filled.

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