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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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General: fixing large slates

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    Hello,im starting a re-roof which will involve re-using the existing very large slates (18 x 36 approx) the old nails were steel and rusted out.I have bought copper nails 3.2mm 50mm long,but they look very small.I have discoved stainless `slate screws` which have a torx head which look good.
    The roof angle is 115 degrees.
    Do the experts here think the copper nails will be sufficient?

    Thanks,
    Chris
    • CommentAuthorMike1
    • CommentTime7 days ago edited
     
    At pitches that steep I'd suggest getting the recommendation of the slate supplier, or tracking down a current copy of BS 5534.

    I know that things were tightened up a few years ago and, here in France, fixing by clips is mandatory on pitches over 50%. Not sure if that's a local reg, or if it reflects tightened European standards.

    Update: looks France-specific. NHBC are still saying twice-nailed, even when vertical - https://nhbc-standards.co.uk/7-roofs/7-2-pitched-roofs/7-2-19-fixing-tiles-and-slates/
    • CommentAuthortony
    • CommentTime6 days ago
     
    I don’t understand 115 degrees
  4.  
    Maybe it is the obtuse angle as opposed to the acute angle.
    So an obtuse angle of 115 deg is the same as an acute angle of 65 deg, just measured from the other side.

    Just guessing !
  5.  
    The 115 degrees is the angle of ridge tiles ontop... basically its not a very steep pitch so nails are not taking lots of weight.
  6.  
    so 32.5 deg rafters ?
  7.  
    yes 32.5 deg rafters...not good for snow!
  8.  
    Posted By: chrisinbrightonyes 32.5 deg rafters...not good for snow!

    A bit more static load but presumably the rafters sizing accounts for the angle, more likely to blow under the slates but that is what the roofing felt is for and less likely to avalanche off as it thaws taking the gutters with it.

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