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What Is a Raft Foundation?
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Understand how a raft foundation spreads building loads, which ground conditions may suit it and why careful preparation and construction checks are essential.
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What is a raft foundation? This guide explains how a reinforced-concrete slab spreads building loads across a wide area of prepared ground. The raft acts as one engineered structural platform and reduces pressure on weaker or variable soils. It covers key components, construction hold points and situations where strip or piled foundations may work better.
For the wider structural requirements, see Approved Document A on GOV.UK, or compare this approach with our guide to strip foundations.
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