Concrete mix C25 or C30

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 22nd Jun 2021
Expert Trade Answers
"C25 would be suitable for this project, and it should cost around £100 for a cube metre"
Answered on 26th Dec 2023 - Member since Nov 2023 - report
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