Solid slab rafts are perhaps the most common type of raft foundation, and they are suitable for projects where the load bearing requirements are relatively light and spread evenly across the structure.
Solid slab raft foundations can be further categorised as flat raft mat, blanket raft, wide toe raft and slip plane raft. There are four main types of raft foundation: solid slab rafts, slab beam rafts, cellular rafts and piled rafts. If the soil is particularly soft, raft foundations may not be appropriate, and an alternative approach would be required, as advised by your surveyor. This assumes that the ground is stable enough to provide the load bearing capacity required for the build. Generally speaking, for domestic projects that have low structural load and a fairly small surface area, raft foundations are ideal. The advice of a building surveyor or structural engineer should always be sought before committing to a project. Raft foundations are shallow foundations, and are therefore not suitable for every building project. Ground excavations are less onerous than for trench excavations, for example, and the foundation and floor slab can often be combined, giving significant savings on materials and time.
Raft foundations are relatively inexpensive and fast to put down, when compared with other types of foundation.
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