How thick is a typical raft slab edge beam?

Edge beam dimensions genuinely vary by design, but are typically deeper than the slab’s main body — providing additional strength around the slab’s perimeter where loads and edge effects are greatest.

The specific thickness and depth for your raft slab is calculated by your engineer based on your soil classification and building loads, not a fixed standard figure applied to every project regardless of these factors.

This is exactly the kind of detail confirmed in your engineering drawings — worth reviewing directly with your engineer if you want the precise figure for your specific design.

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