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daluu 04-15-2012 11:46 PM

Puddling in patio during heavy rains
Just wanted to get your thoughts on this. During heavy rains, the patio gets puddle of water in the middle.

I checked the covered patio ceiling and it doesn't look bad nor did it feel wet when I checked it from a ladder. There are some hairline cracks in the stucco ceiling, which I don't think directly relates to this but not sure. I didn't notice any dripping from the ceiling.

I can understand rain coming into patio when the rainfall is slanted toward the patio. I haven't checked yet, but assume the patio is not totally level/flat to have the water run off and not puddle.

The patio is tiled as you can see from photo. What's the best fix for this? Tear up tiles, and level up the "concrete" beneath then retile (or leave as concrete if I'm cheap)?

Fix'n it 04-16-2012 08:00 PM

how often does it happen ? when it rains hard, is not a correct answer.

daluu 04-17-2012 01:10 AM


Originally Posted by Fix'n it (Post 900524)
how often does it happen ? when it rains hard, is not a correct answer.

So far, every time it rains hard (which has happened lately around the bay area in California). Size of puddle varies by duration (of periods of rain) and amount of rain.

But I do notice that for light periods of rain (say sprinkles), don't get the puddle.

Fix'n it 04-17-2012 08:31 PM


Originally Posted by Fix'n it (Post 900524)
when it rains hard, is not a correct answer.


Originally Posted by daluu (Post 900729)
So far, every time it rains hard


cortell 04-17-2012 10:00 PM

The mystery is easy to solve. On a dry day (when there is no puddle), grab a hose and and turn the faucet to low. Let the water drip on one of the edges of the patio. Observe the water. If it flows towards the center, then you know the rain is going to take the same path. Repeat along the length of the edge and on all four sides.

The solution--not so easy. Tear up tiles and maybe use self leveling concrete? I've heard that stuff is not as easy to use as one would think. I have no personal experience with it, so I can't recommend it. Just suggesting you look into it.

daluu 04-18-2012 12:05 AM

thanks cortell, I'll give that a try.

bob22 04-18-2012 06:07 AM

If the water doesn't drip from the ceiling how does it get to the middle of the room?
Perhaps it is groundwater seeping up from below?
Does the rain hit the edge of the patio and run downhill into the center of the room?

jomama45 04-18-2012 08:03 AM

It looks like the patio was designed to have a drain, and someone omitted that one important step along the way...........

It's likely coming from either driving rain or simple rain splash. The patio base should have been pitched slightly to shed water in the first place, roof or no roof. The fact that there aren't any walls means it will always be subjected to the potential of rain, thus it must be pitched......

daluu 04-18-2012 06:27 PM

I haven't checked the slope / levelness of the patio yet, but I do suspect it's sloped inwards toward the center rather than outwards on the sides for rain to run off, hence the pooling in the center. And I think the grout lines help the water flow from the sides into that center.

Or could it also have sloped inwards over time? Kind of like putting something heavy on a surface that isn't fully able to support the weight, sagging it down over time, or how earth movement can crack concrete from shifting, etc.

cortell 04-18-2012 06:57 PM

I doubt it. More likely is either jojoma45's theory that there was supposed to be a drain there and they intentionally sloped the slab that way, or that whoever poured the slab did a really bad job at screeding it. Maybe they unknowingly used a 2x4 with a significant crown.

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