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Thermalite Turbo blocks u values

Discussion in 'Building Regulations and Planning Permission' started by sleeper341, 17 Oct 2013.

  1. sleeper341

    sleeper341

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    Hi,
    I am building an extension which is in 2 parts, one section set at a slightly higher level than the other (one part is at current floor level, the other part is lower to help prevent light loss from next door) the wall between these 2 sections is mainly internal but has about 200mm projecting above the lower level flat roof.

    Can I build this wall from Thermalite Turbo blocks 215mm deep? I ask as I think that the BCO will say that the projecting part will need to meet the required U value for an external wall (0.28 ) as it is 'outside'. From what I can see these blocks have a u rating of 0.11 so they should be fine but i'm no expert. If I cant use these then it will have to be a cavity wall and I'm trying to gain as much extra space internally even if it is only 4 inches in difference between a cavity wall and using Thermalite blocks.

    Any help is appreciated.
     
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  3. DevilDamo

    DevilDamo

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    Hold on a minute...
     
  4. tony1851

    tony1851

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    If only they did, life would be a lot simpler :lol
    Try 0.5
     
  5. sleeper341

    sleeper341

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    :) I've spoken to my BCO and found that I cant use them. Cavity wall from top to bottom inside it is (or installing a lintel on top of a block wall and then building a low cavity wall on top of this - seems like too much aggravation).

    Thanks for reading though.
     
  6. tony1851

    tony1851

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    If you used the 215 block, had render on the exterior and applied some insulated plaserboard internally to achieve the requisite U-value, you could end up with a thinner wall.
     
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  7. freddiemercurystwin

    freddiemercurystwin

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    Barely, save an inch I guess.
     
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  8. tony1851

    tony1851

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    Fair enough; looking it up, Kingspan says 52.5mm product thickness - probably not much in it.
     
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