Mr Gumby wrote: »
I have a very well insulated timber frame house and find that the upstairs doesn't need heating if downstairs is heated, you could use high efficiency radiators upstairs if needed.
Dudda wrote: »
I've just put UFH in a 50mm liquid screed upstairs in a timber frame house heated with A2W. No issue in doing it once the timber is designed correctly. Use things like timber I-Joists or Metal Web Joists to keep the cost down and they're lighter and easier to work with.
If going the self build route get a timber frame company. They'll take your architect designed drawings and convert them into timber frame drawings working out the size of timbers, spans, etc. They'll come and erect the structure and then you can finish out the rest.