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    Concrete mix C25 or C30

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    Which grade concrete is best between C25 or C30 when I lay 6.1 x3.7 x 0.11m underfloor insulation slab without footing for 6 x 3.6 x 2.5 m SIPs panel garden office with 30cm thick wall?

    Asked by Oto on 19th Jun 2021
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