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I have 2 concrete small slabs (2m x 5m) that are sloped with 1.5% ending in the wall of the lower floor, 3 sides of the slabs have walls (just the low level doesn't). What is the best course of action to deal with this rain water?

Can I just let it run along the wall below?

Should I build a small (10cm) wall in the open end and use a scupper or some other thing?

I don't want to use gutter because I will need to put a ladder against it from time to time for maintenance.

enter image description here

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Can you provide some context about where this is going? you mentioned a ladder - is it high up, or does it drain against a foundation wall? –  Steven Mar 11 at 23:12
    
thanks for the improved diagram! –  Steven Mar 12 at 0:05
    
I edited my post adding the full house in context. This slab will have a water tank above it and also will serve as a middle ground for a ladder getting on the top slab of the second floor. –  Luiz Borges Mar 12 at 0:06
    
And the water runs towards the open end with the door? i.e. it will run down that wall? –  Steven Mar 12 at 2:05
    
@Steven, this is one of the things I'm trying to avoid. But I'm not too concerned because I will probably put an awning above it to protect it from the rain regardless of the method of drainage. –  Luiz Borges Mar 12 at 2:09
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3 Answers 3

It seems like the easiest solution would be to just put up a gutter and then move the lower ladder to one of the other walls, no?

enter image description here

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From left to right, the one against the big wall could be used but I would rather not since I dont like the idea of moving sideways to the slab (and jumping the gutter); the one on the right wall I can't use because that is on my neighbor's side; the one on the back is doable, but the wall over there is much higher (my ladder doesn't reach it), about 4 m. This is why I have a problem, I must use the "open" side. –  Luiz Borges Mar 12 at 1:44
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Agreed, you could even just use a ladder stabilizer so there is no contact with the gutter. –  Steven Mar 12 at 2:11
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or use a shorter ladder so it rests below the gutter –  ratchet freak Mar 12 at 11:24
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I would add a gutter and then use a ladder standoff

enter image description here

You can get standoffs that either bolt onto the ladder with U-bolts or which clip-onto the rungs and are held with a spring-clip

enter image description here

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You could add some drip edge flashing, such as the one in the top right: enter image description here

This would help a bit, and not interfere with the ladder placement.

However, I really recommend putting a proper eaves trough and downspout. This will keep water from pooling against the foundation, and running under the door.

If you really need a ladder space, run the trough over the door, and install drip edge over the 18 inches nearest the wall, so you can place the ladder.

(image source: http://www.easternwahomeinspections.com/drip-edge-flashing-on-your-home-is-recommended )

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