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Suspended Timber GF NHBC 5.2 10b

Postby Melbourn16 » Tue Nov 05, 2019 12:39 pm


I'm planning to build an extension with a suspended timber ground floor.

In order to maintain a 150mm void below the floor joists, the level of the oversite below the floor will be lower than the ground outside the house.

according to the NHBC clause 5.2 10b;

Where the finished level below the floor is lower than the finished adjoining ground level, appropriate drainage should be provided.

What would appropriate drainage look like in this senario? a gully connected to either foul or surface water drainage, or a simple soakaway?

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