Extremely cold floor in new extension?

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Evening gents,

For those of you who have followed, I recently completed a largely self built, certainly project managed rear extension. I went with a suspended timber floor with oversight concrete mix. The floor itself is made up of joists, chip board flooring with 22mm solid oak above this.

All looks great, but damn the floor in the extension gets cold with cold weather. When I say cold, it can't be much warmer than the concrete outside tonight. I don't understand, as with all that timber I really would have expected it to be more insulated and kept warm from inside heat.

No chance of lifting any flooring now, any suggestions? I know this seems extreme, but What about drilling a few holes through the two skins below joist level and pumping full of cavity insulation. I had thought of the little polystyrene balls, which could be sucked out if needed.

Anyway, this may seem ridiculous, but just after thoughts. Ive even thought of a radiator of sort under the flooring. Just a bit bummed after so much hard work.
 
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Should have gone for a solid slab, which uses the warmth of the ground and not influenced by freezing cold air beneath. Plus the other advantages mentioned on the other thread IIRC
 
The other thing that confuses me is that this is a standard 1930 terraced house where the rest of the flooring is also suspended timber. Why is the rest of the flooring notably warmer and pleasant.
 
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Stuart, that's one thing I'm not certain of as we left on holiday while we had some of the dirty work done. I know their is rock wool type insulation between the joists, which I find hard to believe with the temp of e floor.
 
Rockwool? Doh! Hope its thick! Lift a bit of floor and see what's really in there. or stick a camera thingy in through an air brick.
 
I've got 120mm celotex under the floor of my extension. Even so the oak flooring can be a bit cold underfoot until the room heats up.
The floor in your old part of the house might be a bit warmer if there isn't much of an airflow under it.
 

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