Sometimes you just have to have a location and you tell yourself that as long as you get planning you will do anything to build you house there. Often the price that you pay for a site reflects the quality of the ground as well as the location. Bog or soft soil can not be built on! To solve this problem can and properly will cost thousands of Euro. You have to get a digger in to remove the soil until you hit solid ground.
As is the nature of this sort of soil you will most properly have to go below the water level but hard ground should be reached at some stage.. The whole of this area then has to be filled with a solid material usually Lime Stone or similar.
This material has to be filled up to the floor level agreed on your planning permission. Once the hole is filled the Lime stone has to be compacted, this is achieved by rolling a vibrating roller over the area until there is no more movement in this area.
This could take one or two days of consent use. To be extra sure that your house should stand the test of time a raft foundation is a must.
As with any site that you buy the soil should be inspected by a qualified engineer. If rocks are found either a full excavation has to be done or the ground has to be fully compacted with the proper machinery. Remember a foundation
can not be built on large locks because the movement could crack the foundation. A Raft foundation is recommended.
This can be a very big problem depending on the percentage of clay in the soil. Due to the fact that clay soil in non draining and in extreme dry spell can crack and shrink which could crack the foundation again a raft foundation is required.