Suspended Timber GF NHBC 5.2 10b Re-generate an old or tired space and give it a fresh breath of life. Click here for answers, information and tips

[Melbourn16]

Hi,

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?

thanks