External wall construction - possibly done wrong in a newbuild?

Discussion in 'Building' started by RookieTony, 25 Nov 2021.

  1. RookieTony

    RookieTony

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    Dear forum members!

    I am a complete novice in these matters and would greatly appreciate your help.

    I have external wall specification for my house listed as such:
    upload_2021-11-25_21-5-46.png

    So I assume that wooden sheathing must be BEHIND the TSW studs.

    This is confirmed by the Celotex website:
    upload_2021-11-25_21-6-39.png

    However, I've just had to open up the wall and I noticed that the sheathing is right behind the plasterboard! My poor oscillating mutitool nearly broke down.

    First, is this normal?

    What are the side-effects of having the sheathing on the inside of the studs?

    Thank you!
     
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  3. A_Novice

    A_Novice

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    I'm no expert but there is probably sheathing on both sides.

    They've put it on the inside so you can hang what you like on it

    Maybe....
     
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  4. ^woody^

    ^woody^

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    No What make is it?
     
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  5. RonnyRaygun

    RonnyRaygun

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    It might be depressed?
     
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  6. ^woody^

    ^woody^

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    Or oppressed?

    Anyway, sheathing could be on either side of the frame or both.
     
  7. tony1851

    tony1851

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    'Facing brickwork (5N/mm² min.)'

    Are the bricks made of mud?
     
  8. RookieTony

    RookieTony

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    I hope so! In any way, this would violate the plan..
     
  9. RookieTony

    RookieTony

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  11. RookieTony

    RookieTony

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    So it's not a structural problem then? Good! Thank you!
     
  12. RookieTony

    RookieTony

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    It could be the local Southwater Brick, which is sort of made of mud. I've heard that half of London is built on it :)
     
  13. ^woody^

    ^woody^

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    I wondered when did bricks get reduced to 100mm? And who the hell designs a 51mm cavity?
     
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  14. noseall

    noseall

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    I think the plasterboard thickness is about the only plausible generic measurement on that diagram.

    I'm still trembling from that octagonal nightmare in the other thread...
     
  15. ^woody^

    ^woody^

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    If it's not going to be even skimmed. :rolleyes:
     
  16. RookieTony

    RookieTony

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    Sorry guys, can I please ask what you are talking about?

    I have found this table online:
    ● Common building bricks—3.43 N/mm2

    ● Second class bricks—6.867N/mm2

    ● First class bricks— 10.3N/mm2

    ● sun dried bricks— 1.47 – 2.45 N/mm2

    ● fly ash bricks— 8.82 – 9.81 N/mm2

    ● AAC block — 2.943- 3.92N/mm2.

    The document outlines that the facing brick should be at least 5 N/mm2, which apparently means that First Class or Second Class bricks should be used. Is that not what it means?
     
  17. noseall

    noseall

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    We were just arrogantly mocking some of those nonsense measurements on the Celotex link. No dramas. As Woody has said, the ply sheathing is there to stiffen the structure reducing wind load racking etc. It's useful on both leaves but more often fitted to the outer cavity side.
     
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