minimum roof pitch?

Discussion in 'Building' started by matt73, 18 Feb 2006.

  1. matt73

    Joined:
    24 Jul 2005
    Messages:
    59
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    does anyone know what is the minimum pitch allowed for a sloping roof to my extension. i've calculated the propsed roof angle at 19-20 degrees. i am not sure if building control will allow this.

    also i am woried about rain going under the tiles. any advice would be appreciated.

    matt
     
  2. noseall

    Joined:
    2 Feb 2006
    Messages:
    21,738
    Thanks Received:
    1,392
    Location:
    Staffordshire
    Country:
    United Kingdom
    19-20 deg is ok provided youre using interlocking concrete tiles sutch as marley wessex wich can be fitted to a roof as shallow a pitch of 17 deg.
     
  3. matt73

    Joined:
    24 Jul 2005
    Messages:
    59
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    just been on marley site. looks like my existing tiles are anglia interlocking concrete only suitable for 30" so it looks like i'll have to go for a different tile of same style.

    cheers
    matt
     
  4. hammerswinger

    Joined:
    26 Jan 2010
    Messages:
    315
    Thanks Received:
    26
    Location:
    Tyne and Wear
    Country:
    United Kingdom
    To help stop the rain going under the tiles you would increase the headlap of the tile to 100mm (75mm is standard)

    It's also worth bearing in mind that the pitch (angle) of the roof tiles will be a couple of degrees less than the pitch of the rafters, in the case of the Marley Wessex I think it's about 3 degrees less.
     
  5. freddymercurystwin

    Joined:
    21 Jan 2007
    Messages:
    15,066
    Thanks Received:
    1,656
    Location:
    Devon
    Country:
    United Kingdom
    The pitches as quoted by manufacturers refer to the pitch of the roof not the actual angle of the tile.
     
  6. hammerswinger

    Joined:
    26 Jan 2010
    Messages:
    315
    Thanks Received:
    26
    Location:
    Tyne and Wear
    Country:
    United Kingdom
    I'll have to take your word on that one as I don't know for sure if that's the case.
     
  7. hammerswinger

    Joined:
    26 Jan 2010
    Messages:
    315
    Thanks Received:
    26
    Location:
    Tyne and Wear
    Country:
    United Kingdom
    Just found this so I guess if one manufacture uses that method they all will, so yes you are quite correct, it is rafter pitch.
    http://www.monier.co.uk/faq-s/performance-and-appearance.html

    That said I would still try to keep the roof at the best (highest ) pitch practical.
     

Share This Page