Concrete Raft Floor Construction

Raft slabs are now a well established and proven type of concrete floor slab.

Concrete raft floor construction.

Typically a thickened reinforced area is created at the perimeter of the raft to form an edge beam supporting the external walls of the building. Rafts are most suitable when the ground is of good load bearing capacity and little work is required to get a solid foundation. This type of foundation spreads the load of the building over a larger area than other foundations lowering the pressure on the ground. 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.

The raft foundation is a very commonly used type of foundation system. They offer considerable benefits over conventional block base type slabs at significant cost savings reduced construction time increased strength and superior insulation. Raft foundation is also known as mat foundation. The concrete slab price is determined by the tonnage of steel and concrete required to construct the slab or concrete structure.

Insulation will generally be laid on top of the raft with a concrete floor or raised floor above. Common mistakes in concrete floor slab construction can be avoided with proper base preparation mix design placement finishing and curing. An engineered raft foundation and flooring system that offers real benefits over a conventional concrete slab. Each slab structure is designed for a specific span load and is priced accordingly.

The raft is laid on a hardcore or scalping bed and usually thickened at the edges especially in very poor ground. A raft foundation spreads the weight of the building over the whole ground floor area of that building. Standard concrete floor slab thickness in residential construction is 4 inches. Each raft slab is engineer designed to suit onsite conditions.

This is an alternative if you can t use a traditional strip or trench fill foundations. Ribraft floors are an innovative method of raft concrete floor construction is quick and efficient to lay it offers excellent insulation benefits and is seismically strong. Concrete slab raft foundation pricing. Then a waterproof plastic sheet is laid over the earth and a thin 3 layer of plain cement concrete pcc is poured just to create a perfectly flat and level base for the foundation.

A concrete toe often supports the external leaf of the wall. A raft foundation is constructed by first excavating the ground to a uniform flat level. Ready super slab is an above ground engineered raft foundation system commonly known as a raft foundation pod floor waffle slab or floating foundation that delivers real benefits over a conventional concrete floor and foundations.