Chester Conservatory Build Process
February 20, 2009
1. The site of the proposed conservatory.
2. Construction work begins. The trench is excavated to suit the relevant ground conditions, in this case, to a depth of 450mm (minimum depth) for the footings. The general ground level (within the area of the trench) is also reduced to a minimum of 300 mm below the DPC. Excavation exposes an underground pipe.
3. Concrete lintels should be placed to bridge the underground drainage pipe to prevent the pipe being crushed. Also additional steel reinforcement mesh introduced to the concrete foundation will provide additional support.
4. Stakes driven into the ground are set 450mm below DPC (Damp Proof Course) and 300mm below outside ground level. Concrete is then poured into the 450mm deep trench to a depth of 150mm.
5. The concrete is floated to form a level surface 450mm below the house DPC
6. The inner leaf of the cavity wall is built up to floor level, usually the house DPC.
7. Hardcore is laid to a minimum 100mm deep and compacted to form the base layer of the slab.
8. A blinding screed of sand 50mm thick is laid over the compacted hardcore layer to prevent any sharp stones puncturing the damp proof membrane (heavy duty plastic sheeting).
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