Choosing the Right Concrete Grade for a Garden Foundation

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Picking the right concrete grade for your garden foundation is all about balancing strength with practicality. For most sheds, greenhouses, or small patios, a standard C20 mix works fine—it's tough enough for light loads and resists cracking from frost. If you're planning something heavier, like a large workshop or a retaining wall, bump up to C25 or C30 to handle the extra weight without breaking your back. Just remember, a weaker mix might save a few bucks now but could cost you in repairs la…