Drafty upstairs suspended wooden floor semi-detached house

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30 Jul 2013
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Hertfordshire
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United Kingdom
Hi all, I have a 1930s semi detached house and while doing a number of things to the house with the floor boards up in all upstairs bedrooms there is a draft between the suspended floor upstairs/down stairs ceiling. There is a bay window at the front of the house which has a small roof which I believe is where the draft is coming in.

FYI the house is solid brick and has no cavity/inner leaf. Also the external brick work is rendered with NO cracks.

Firstly is this normal and by design to provide ventilation to the timbers?

Secondly I would like to pull the carpet up in each room at the external wall use a small amount of insulation held in place with a sheet of wood/plasterboard to the exact width and height of each section which in theory will block out air/draft from any possible gap.

Thanks,

Mike
 
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I would just stuff some insulation (rockwool or similar) in between the joists where they meet the external wall. My guess is you a probably right about the draught coming from the bay.
 
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Hi there, I have pulled up the floor boards close to the external wall on one bedroom and sealed any gaps I could find where air could be coming in through the brick work.

Can I use celotex board cut to the size of each joist to act as a second seal within the floor.

My only worry is that there will be zero ventilation in this small section where the joist go into the wall.

As this is a first floor and not the ground does this matter, I'm a little concerned about ventilation and possibly rotting of the joists if I do this?

Please advise,

Mike
 

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