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flat roof slope ?

Discussion in 'Roofing and Guttering' started by chippiewood, 21 Sep 2008.

  1. chippiewood

    chippiewood

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    please what is the general fall or formula of a felted roof on an extenstion
    the roof i am working on is about 6 meters long
     
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  3. masona

    masona

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    Is it 6m to the gutter?
     
  4. chippiewood

    chippiewood

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    yes masona roof size.... 3m wide x 6 m long so the cutter is at the short end
    so the cutter will be 3m long,
     
  5. masona

    masona

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    Normally minimum 1:40 for rainwater to drain off
     
  6. chippiewood

    chippiewood

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    cheers :)
     
  7. Thurston

    Thurston

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    sorry have posted in wrong thread

    will repost elsewhere :oops:
     
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  9. noseall

    noseall

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    1 in 80 should be ok for a roof.

    1 in 40 is reserved for foul drains. ;)
     
  10. Cambridgeroofer

    Cambridgeroofer

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    The correct minimum fall of a flat roof should be 1:60 by design to acheive 1:80 with deflection ie sagging over time but with flat roofs with a gutter and no internal outlets to worry about over whelming the greater the fall the better. 6m/60 = 100mm difference between top and bottom
     
  11. chippiewood

    chippiewood

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    tar cambridgeroofer...very useful information :D
     
  12. memor maplin

    memor maplin

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    1:60 1:40

    Could someone please tell me what this actually means ?

    What is the 1 and what is the 40 or 60 ?
     
  13. rjm2k

    rjm2k

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    It's a ratio, so 1 whatever for every 60 whatever eg 1cm drop for every 60cm horizontal or 1 inch drop for every 60 inches horizontal, or 1 mile for every 60 miles, 1 potato for every 60 potatoes etc etc.
     
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