Raft Foundation For Garage Uk
An alternative may be a raft foundation.
Raft foundation for garage uk. Some properties have been constructed on landfill sites which may require a more extensive form of foundation like piling as the depth of undisturbed ground could be many metres deep. The foundation can not be poured until undisturbed ground has been found. I built a extension on a. A raft foundation is a reinforced concrete slab under the whole of a building or extension floating on the ground as a raft floats on water.
Can i build off a reinforced concrete slab for a double garage i am about to build a double garage it requires no planning or regs as long as i stay within 30sq mtrs and under 25 high i have already checked with my local council. When doing previous digging out he has found that the ground is very rocky and so was thinking of using a shallow raft instead of traditional strip foundations. This type of foundation spreads the load of the building over a larger area than other foundations lowering the pressure on the ground. Raft as opposed to trench foundations.
This is due to dessication and heave problems. A structural engineer will. Im not sure a raft is capable of dealing with these problems as the heave will still move the slab hence the deep foundations. The additional cost over trench was 6k.
Rafts are most often used these days when the strata is unstable or because of this a normal strip foundation would cover more than 50 of the ground area beneath the building. Im helping a neighbour out by drawing up plans for a double garage double skin block construction size 6m wide x 72m deep. Nhbc 42 states guidance on foundation depths to be dug within certain distances of trees. Ours is similar size at 76x63.
This is an alternative if you cant use a traditional strip or trench fill foundations. Same reason proximity of conifers. You need a strip foundation say 450mm wide i wouldnt trench fill it puts the concrete too close to the surface plus the cost of concrete and the restraints of getting it to the site if you have any. Raft foundations how to make raft foundations are made.
My local bco advised at least 600mm deep trench on sandy soil and 1000mm on clay oh and 150mm thick concrete. Building and pouring a foundation for a garage allows you build a structure for storage parking cars or use as a workshop. Quite a bit. Foundations provide support for structures transferring their load to layers of soil or rock that have sufficient bearing capacity and suitable settlement characteristics.
The foundation must be built level and reinforced to handle any shifting ground as well as the weight of the structure.
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