Ask The Trades - Print Page

Ask The Trades
https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Building Questions >> Underfloor ventilation for new extension https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1428055981 Message started by PatPending on Apr 3^rd, 2015, 11:13am

Title: Underfloor ventilation for new extension
Post by PatPending on Apr 3^rd, 2015, 11:13am

In order to ensure through airflow from the front of the house to the back, the guy drawing the plans for a ground floor side return extension has suggested excavating a 700mm void under the entire new floor area, laying a concrete base with floor joists running above the void. Builders I have spoken to have suggested a solid screed onto the ground with ventiation pipes running through. The latter is a lot easier as does not involve excavating the entire floor area.

Thoughts on why either may be more appropriate would be appreciated.

Thanks

Read more: http://www.diynot.com/diy/threads/underfloor-ventilation-for-new-extension.431286/#ixzz3WEus8bD7

Title: Re: Underfloor ventilation for new extension
Post by thescruff on Apr 3^rd, 2015, 7:17pm

Why not slide 2-3 ( depends what you need) 100mm duct pipes from where the existing air bricks are to the back of the space, you could even drill several holes in the pipe to even the flow.

Forgot, you may need a vapour barrier over the pipes before you lay the floor.