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passing 40mm pipe through wall - use 50mm core drill

Discussion in 'Plumbing and Central Heating' started by garyo, 21 Feb 2012.

  1. garyo

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    When coring our a hole in an external wall for a 40mm waste pipe, would you use a 50mm core bit so that you could use 5mm of sealant all round?

    Thanks
     
  2. mickyg

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    as long as the core is bigger than the pipe it doesnt really matter !
     
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  3. TicklyT

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    £1 to a pinch of s*** says your nominal 40mm pipe isn't actually 40mm OD.

    and a chance to win your money back - another £1 says the hole won't finish dead on 50mm either.

    If the hole isn't looking dead square at the pipe run you'll be glad of a bit of clearance anyway.
     
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  4. vicvapour

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    Normally you would use a 44mm but 50 is fine as said previously, as long as it IS actually bigger, is doesn't really matter, just a little bit more making good to do really mate.
     
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  5. garyo

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    Cheers guys, I was thinking that a 40mm hole would be too small because that would leave zero space to get sealant in. I didn't realise you could get 44's... I'll go buy one.
     

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