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Drafty upstairs suspended wooden floor semi-detached house

Discussion in 'Building' started by myk3, 7 Jan 2014.

  1. myk3

    myk3

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    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
     
  2. kbdiy

    kbdiy

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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.
     
  3. myk3

    myk3

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    thanks, i assume the timbers will be ok with the lack of ventilation?
     
  4. myk3

    myk3

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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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