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Cavity closures - around windows and tops of walls?

Discussion in 'Building Regulations and Planning Permission' started by shabbaranks, 4 Apr 2021.

  1. shabbaranks

    shabbaranks

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    Hi

    Had Billy building control here the other day and one of his comments was cavity closures. He didn't stipulate if he meant around the windows and doors cavity or this as well as on the top of the cavity wall.

    Do you need to do the lot? The reason I ask is Im sure my bungalow doesn't have any closures on the cavity walls (not that I can see anyway). Im not a builder just a labourer and someone thats interested in learning

    Thanks guys
     
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  3. denso13

    denso13

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    Ask Billy? It's hard to second guess what he was meaning but he may be happy to explain further?
     
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  4. shabbaranks

    shabbaranks

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    Looked through the plans and that shows all cavity closures are required on the walls and windows so thats what I'll do.

    Are they are requirement though? Like I say when we built in the current external wall of our place the cavities didn't look closed to me (1986 build)
     
  5. SpecialK

    SpecialK

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    I asked my BC this question a week ago. He doesn't require me to close the cavity at the top of the walls only around the door and window openings... Perhaps your building design is different?
     
  6. tony1851

    tony1851

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    He doesn't require me to close the cavity at the top of the walls

    The main reason the fire at Grenfell spread so quickly across the facade was the poorly-fitting cavity closers in the external cladding.

    Under Building Regs, cavities are supposed to be closed at window- and door reveals, and at the tops of cavity walls. Your inspector needs to read up his Approved Doc. B.
     
  7. SpecialK

    SpecialK

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    5.19 Close cavity at top of wall (unless cavity is totally filled with insulation)

    Seems I don't need them at the top as its a fully filled cavity...

     
    Last edited: 5 Apr 2021
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  8. ^woody^

    ^woody^

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    Insulation at the top of a cavity should run continuous with the roof insulation.

    At reveals, cavities should be closed but that does not mean that cavity closers must be used.
     
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