RAFT FOUNDATIONS
Raft foundations can be a suitable alternative if Trench Fill and Deep Strip foundations cannot be used. However, there can be problems using them for a conservatory unless adequate steps are taken to ensure that the edge of the raft abutting the existing property will not break away when the raft settles. This occurs due to different settlement rates for the new conservatory and the existing building. If there is a difference, a crack will open at the join or in adjacent walls.
This is most likely to happen in ground where the substrata is not solid, or when trees are nearby that can affect the foundations. Your architect or builder will be able to calculate the weight of the conservatory and ascertain whether the ground is sufficiently consolidated and capable of supporting the load. They will also advise about the distance of trees from the conservatory.
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