![Picture](http://constructionstudiesq1.weebly.com/uploads/1/6/4/9/16490624/1000701_orig.jpg)
The edge of the raft is stepped, creating a toe, which allows the outer leaf of the wall to continue below ground level.
It is vital that the concrete slab is strengthened by the use of steel reinforcement.
A radon barrier is installed to form a continuous seal on the entire footprint of the house.
A Damp Proof Course is installed in order to repel any rising moisture. It is vital that the DPC is carried up into the blockwork to form a water tight seal over the entire floor area.
The DPC must run through the blockwork at a minimum of 150mm above finished ground level.
A radon barrier is installed to form a continuous seal on the entire footprint of the house.
A Damp Proof Course is installed in order to repel any rising moisture. It is vital that the DPC is carried up into the blockwork to form a water tight seal over the entire floor area.
The DPC must run through the blockwork at a minimum of 150mm above finished ground level.
![Picture](http://constructionstudiesq1.weebly.com/uploads/1/6/4/9/16490624/1364409106.png)
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