Build Better

Choosing the Right Concrete Grade for a Garden Foundation

When you plan a garden foundation, the concrete grade you choose determines how well the slab will hold up under load and weather. The direct answer is that a mix with a compressive strength around 20 to 25 megapascals (MPa) is usually right for a domestic garden shed, greenhouse base, or small workshop floor. That typically means a C20 or C25 ready-mix concrete. For a light-duty path or a simple pad for a bird bath, a C15 mix may be enough. For a garage or a larger garden b