raising a floor over underfloor

Charlie 08

My sitting room is split level with underfloor on both levels.I'm thinking of raising the lower level.I realise the underfloor heat will be impacted but will it make a huge difference?

Lumen

Raise by how much?

Charlie 08

5 inches.

Calahonda52

raised with what?
It helps if we have full information: its not 20 questions:D

Charlie 08

ðŸ˜
Floor will be raised with joists. current floor is semi solid wooden floor which will be removed before joists go down. Still at planning stage (i.e. in my head!!😉)

listermint

Split level tends to be a good seller come sale time. Id reconsider unless you have a real requirement to other than asthetic

Lumen

I think there are two aspects to this.

1. Efficiency. If your subfloor isn't well insulated, adding layers on top, acting as insulation, will tend to make more of the heat escape down through that subfloor.

2. Heating lag. You will have to wait longer for the heat to propagate through, which will be a pain in the hole unless you run the heating continuously through the heating season.