Types of foundation
Strip foundations are the most common for domestic work — a continuous trench of concrete under the walls. Trench-fill is similar but the trench is filled to near ground level, saving on blockwork. Raft foundations spread the load across the whole footprint and are used on weaker ground.
Your structural engineer or building control officer will specify the type, depth and mix. Follow that spec exactly.
Mix grades for foundations
C30 is typical for reinforced strip and trench-fill foundations. C35 may be specified for heavier loads or poorer ground. The spec exists to ensure the concrete can carry the design load — don't substitute a weaker mix.
With volumetric concrete, the mix is batched on site to the exact grade specified. If the engineer changes the spec on the day, we can adjust.
Quantities and delivery
Foundation pours are often 4–8m³ — a single volumetric wagon can handle most domestic foundations. For larger commercial footings, we schedule consecutive loads.
Check that the wagon can get to the trench. If access is tight, we can pump or barrow. Tell us about any overhead cables, narrow gates or weak drain covers when you request a quote.
Always follow the engineer's spec
We supply concrete to the mix grade and quantity you specify. We don't give structural engineering advice — always follow your engineer or building control officer's specification for foundation depth, width and mix.
If you're unsure what to order, tell us what you're building and we'll advise on the practical delivery side. But the structural decisions are your engineer's.
Related services
Need concrete for your project? We supply volumetric concrete across South Wales, mixed fresh on site to the exact quantity you need. Request a quote or call 01495 820164.