Daft question about carpeting attic floorboards and heat loss

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okeydokey

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So in my 1930's house where I have lived for 35 years their is a non habitable room in the attic - I think the precious people had a son lived up there.
To the point - the room has fibreboard walls and ceiling and the floorboards are covered with a sort of cardboardish underfelt with a woollen carpet on top.
The (woollen) carpet was in place and old when we moved in (looks a bit like the sort of pattern your grannies granny might have had down and as usual the attic is full of stuff and awkward to move around, needs a good throw away time.
The light I put in 30 years ago was a D (?) shape fluorescent I had a spare from work and did the job much better than a light bulb on as string effect. Yesterday I decided to replace the light with a circular led panel lamp and its just the job much improved.
The brighter light showed an area of carpet that looked threadbare on investigation I found a carpet moth infestation had occurred so cut that bit out seems isolated to one patch at the moment it seems prudent to take it all out moving stuff around as I go.
There is no insulation under the floorboards so quite a large area of the roof/loft is uninsulated.
If the I think if the tongue and grove floorboards (haven't got to them yet) can be persuaded to come up I can put some insulation in (upstairs rooms are always cold).

If I don't do the board job do folk feel that recarpeting will act as some sort of insulation for the rooms below (must do something) or just leave it as bare boards?

As I'm typing this I think the answer is really got to be and it will be a pain to do as the (obviously unheated) attic being overfull to insulate but anyone have an idea whether carpet will be as effective or worth doing?
 
Carpet typically has a tog rating (maximum is 3 normally) tog is equivalent to R value x 10.

25mm Rockwool has an R value of 0.71 so a 3tog carpet would be equivalent to about 10mm of rockwool. I wouldn't bother....
 
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