Mid Terrace Suspended Floor Insulation - Is it worth it?

Michael_Hobson

I have been trying to find out it if is worth getting underfloor insulation for a suspended floor with no avail.
I live in a mid terrace house, the suspended floor is sealed so no draughts.   The floor construction is the original floor boards, ~2mm of 'foam panels' and then a laminate floor.
I have got a quote of £900 to put 100mm thick insulation between the joist which is hold into place by netting.  Note that I would only have to pay £300 of this because of the current Green Fund Scheme.
I know the scheme is good and its always good to save the environment but is it really worth paying for the insulation? How long will to take to recoup the money plus would I actually notice the difference?
Note that the rest of the house is well insulated plus I receive a lot of heat from my neighbor's as they always seem to have the heating on.
Looking forward to hearing peoples thoughts. Thank you.

RelievedSheff

We have moved from a house with no underfloor insulation to a house with lots of underfloor insulation and the floors are noticeably warmer to walk on. For £300 I would be jumping at the chance to get it.

Davesnave

I've got 100mm under the floor in my conservatory. That demonstrates what I think re insulating floors!

FreeBear

Depending on the age of the property, you may only have 75mm joists - Trying to squeeze 100mm of insulation under there may not be possible. You also need to watch the thickness of insulation over any sleeper walls. If you block the air gap in that area, it will compromise underfloor ventilation and potentially lead to things like damp & rot.

Yes, underfloor insulation is a great idea, but only if the floor construction allows for it to be retrofitted. If you have limited space, then 25mm of Celotex/Kingspan type boards might be a better option. Whilst not enough to meet building reg requirements, it would be better than nothing.