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Which type of slab cannot be penetrated for a stair opening?

Flat slab

Waffle slab

Post-tensioned slab

A post-tensioned slab cannot be penetrated for a stair opening because it is specifically designed to carry loads through high-tensioned steel strands that are tensioned after the concrete has cured. These strands are placed in specific patterns to optimize structural performance and load distribution. Making an opening for a stair would compromise the structural integrity of the slab, as it could disrupt the continuity and effectiveness of the post-tensioning system.

While other slab types, like flat slabs, waffle slabs, and prestressed slabs, can typically accommodate openings with careful design considerations and reinforcements, post-tensioned slabs prioritize their tensioned cables in their construction, making them highly sensitive to any modifications that would impact their performance.

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Prestressed slab

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