Patio Slope/Incline?

jammell

Hi folks,
I've recently had a patio installed by a builder/landscaper and there's quite a slope on it.
I'm aware that patios should have a slope to allow for rainwater to not pool, but I'd like to ask on here how noticeable/steep it should be.
The patio is about 5m in length and 10m in width. Width wise the slope isn't noticeable, but length wise it is.
I don't know the exact angle, but if you place a ball on one end of the patio it'll quickly roll to the other. Is this normal?

stuart45

Rule of thumb  1 in 80 fall is normally enough.

TELLIT01

On that basis the fall should be about 6 to 7cm if my maths is correct.

stuart45

TELLIT01 said:

On that basis the fall should be about 6 to 7cm if my maths is correct.

Sounds about right for the length.  Depends where he wants it to fall to.

jammell

Thanks for the responses.
I think the incline is too steep, I've put a spirit level in several places on the slabs (600x600) for an average and the bubble is pretty much touching the end on each one. My kamado BBQ weighs 100kg and rolls down the patio on its wheels.

stuart45

It's better if you use a long straight edge, eg 6ft or so, to get a better reading. It does sound like a bit much.

TELLIT01

Use a length of string.  Tie it to a brick or stone at the high point with the string touching the paving.  Push a cane into the ground at the low point and raise the string up that until the bubble is centred. Measure from that point to the slab below. That will give an accurate measurement for the total fall.  Let us know that figure.

getmore4less

Hose full of water more accurate than a spirit level

jammell

TELLIT01 said:

Use a length of string.  Tie it to a brick or stone at the high point with the string touching the paving.  Push a cane into the ground at the low point and raise the string up that until the bubble is centred. Measure from that point to the slab below. That will give an accurate measurement for the total fall.  Let us know that figure.

Existing patio is 3m, barely noticeable slope angled away from the house.

Recent extension is 3.5m, slope towards the house. The height difference is 12cm from brick to cane.

stuart45

How many metres is the 120mm fall in?

jammell

 stuart45 said:

How many metres is the 120mm fall in?

3.5m