Calculating Fall for new Patio (Beginner)

Discussion in 'Landscaping and Outdoors' started by JBird, May 25, 2020.

  1. JBird

    JBird New Member

    Hi All,

    Any advice on calculating this correctly would be of great help.

    I have a space of land that is 31.4ft(l) by 9 ft (w). I want to patio this with slabs and have been trying (and failing) to figure out the correct fall needed from the top to the bottom for drainage.

    I have read that the ratio is 1:80, with my calculation coming out at 11 inches from top to bottom.

    I am using the following patio slabs:

    Any help calculating the fall is really appreciated!
  2. ramseyman

    ramseyman Screwfix Select

    A fall of 5 inches over the 31ft length is approx. 1 in 80
  3. ramseyman

    ramseyman Screwfix Select

    Better to tip it away from the house over the narrower 9 ft width if you can - that's about an inch fall
  4. JBird

    JBird New Member

    Thanks Ramseyman.

    Out of intreat what would a 10m (l) ratio be?
  5. Abrickie

    Abrickie Screwfix Select

    Seriously ? Whatever device you’ve posted with has a calculator, divide by 80 :rolleyes:
  6. ramseyman

    ramseyman Screwfix Select

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