The site of the proposed conservatory		The ground is excavated to a minimum of 450mm deep for the footings. Excavation exposes an underground drainage pipe in this example.
	Additional steel mesh reinforcement is introduced to the concrete foundation to prevent the drainage pipe being crushed. Another alternative is to insert concrete lintels above the drain in order to bridge it.		Concrete is poured into the trench to form the foundations. The concrete is a minimum of 150mm thick
	The concrete is floated to form a level surface to build upon.		The inner leaf of the cavity wall is built up to floor level

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