Insulation and ventilation

Discussion in 'General DIY' started by Idiyh, 20 Nov 2021.

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  1. Idiyh

    Idiyh

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    Hi everyone,
    I'm trying to insulate the gap between the sunken gas box that depresses into the wall outside and the inside of the property.
    It looks like whoever did it smashed the bricks and so there is a void.... Can you advise how to do it. Thankyou
    The first 3 pictures are under the kitchen units. How best is it to insulate these areas while still providing adequate ventilation please?
    Thes last picture shows the void... Pictures might explain better.
     

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  3. foxhole

    foxhole

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    Just sand cement mix. No point insulating under kitchen units.
     
  4. JohnD

    JohnD

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    Except to stop cold draughts
     
  5. Idiyh

    Idiyh

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    Thankyou... I don't get drafts it's just cold... Its so frustrating... Any idea how to keep it warmer behind the units
     
  6. Idiyh

    Idiyh

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    Hey foxhole,
    Thing is, is there is a big void where someone previous has put little white like polystyrene balls in the gap... Seems useless looking at it.
    Any ideas to build on what you said... Thankyou
     
  7. foxhole

    foxhole

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    The white beads are probably cavity insulations spilled when the hole through the wall was done.
     
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  9. Idiyh

    Idiyh

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    Looks like you are on the money.... So my next question is how to contain them and close it up without bridging gap for cold and damp to cross?
    Thankyou
     
  10. foxhole

    foxhole

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    Like I said sand cement, you won’t get bridging across beads.
     
  11. Idiyh

    Idiyh

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    Thankyou,
    So in the picture the RED lines indicated the gap width that travels down the wall.
    The BLUE line indicates the smashed electric BOX. Where do you suggest to seal it up because the mortar would simply fall in the gap?
    Thanks
     

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  12. foxhole

    foxhole

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    Wet mortar sticks, you could add a thin sheet of timber to seal the box.
     
  13. Idiyh

    Idiyh

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    Foxhole.... Imagine you are looking 90 degrees down a cavity wall. If you Mortar it perpendicular to it, it falls in.
    Do you think it's also a good idea to pack it with polystyrene balls too?
    Thankyou
     
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