I am thinking about sips construction for the extension and would like to ensure that the thermal qualities in the old part of the house meet the standards in the new.
I want an underfloor heating system throughout (the ground floor) but worry that the old house is too leaky, making it ineffectual as a whole.
I would also like to ask: if you have excellent insulation on the upper floor whether Underfloor heating is sufficient on ground floor only.
We have considered External insulation, but feel the character of the property would be greatly reduced.
The House at the moment suffers from condensation (not v badly, but enough to require painting every few years) and i would really like this to stop.
I do not want to put internal wall insulation in, only to find that the problem is just being covered up and left.
Currently the roof in the old house is well insulated and the house is D Glazed.