what is a raft foundation
Raft Foundations. Raft foundations (sometimes known as Mat Foundations) are a large concrete slab which can support a number of columns and walls. The slab is spread out under the entire building or at least a large part of it which lowers the contact pressure compared to the traditionally used strip or trench footings.ummary: Find out about concrete Raft foundations; find out what they are and when they are typically used. This project will help you to make the decision to use a raft for your footing. We will help you to understand the advantages and disadvantages of using raft foundations.