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Old 04-18-2011, 11:08 AM   #1
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Adding drain(s) to concrete floor in carport?


I bought a house last year that we love but one issue - the attached carport's concrete is sloping towards the house and during a heavy rainfall the rain comes in under the carport's roof and pools up in the middle, and eventually when the pool gets too big the water runs towards the house. Some penetration is occurring into the basement.

I was hoping there might be a way to add a drain in the center. Is it just a matter of getting a big ole concrete drill bit (I wouldn't be doing this myself - I would hire someone), drilling down, and then inserting a round metal drain? I assume it can drain directly down into the ground?

Any idea on whether this makes sense and, if so, costs? If this is a lame-brained idea, then aside from ripping out the carport (which I cannot afford to do), what are my alternatives other than constantly going out there and sweeping the water away when it rains hard?

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Old 04-18-2011, 11:59 AM   #2
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Adding drain(s) to concrete floor in carport?


Perhaps you could place a mansard around the perimeter of the carport.

Would something like this work on the side where the rain blows in...



This louvered wall can be done in way that will look great with most homes.

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Old 04-18-2011, 12:28 PM   #3
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Adding drain(s) to concrete floor in carport?


Thanks. I don't think something like that would work, but I'm not really sure what that is/how it would work so I could be wrong.

This carport is on the side of the house and the rain comes in from the backside, a few feet into the carport and then pools up and eventually flows to the side of the house.

I originally was just thinking maybe adding a drain would be best, but perhaps there is something I can attach to the siding on the back of the carport that would stop the rain from entering.
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Old 04-18-2011, 12:51 PM   #4
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Adding drain(s) to concrete floor in carport?


I don't think you can just put a hole in the middle and hope that the water will just disappear. I think it will still pool up, but underneath the carport floor. You need to give the water somewhere to go (unless you block the back of your carport like you said).

If you put in a drain, I think you would have to add a pipe to lead it else where. OR dig a much larger hole and add a "dry well" (basically a large hole filled with gravel that will hold a large amount of water and the water slowly seeps out the bottom of it into the earth). OR put a sump pit under the drain with a pump pumping the water out ... but that would need a pipe to get the water out of the carport area anyway.

Simplest is what you said about blocking the rain from getting in there in the first place, best would be to somehow drain the water (without a pump) elsewhere away from the house.
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Old 04-18-2011, 02:27 PM   #5
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Adding drain(s) to concrete floor in carport?


i gotta do this, too,,, the *&^%##$%^& jabonies placed the conc in our garage so ANY wtr draining off wet vehicles runs into the sole plate under the drywall making any rainfall a 'come & get it !' for possible termite attack i'll put in a slot drain & drywell of 30gal capacity,,, if i need to pump it out, there's usually 5 zoeller submersible pumps sitting on a nearby shelf you may need a larger capacity & an overflow drain,,, nevertheless, thanks for posting the reminder

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Old 04-18-2011, 02:28 PM   #6
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Adding drain(s) to concrete floor in carport?


Quote:
Originally Posted by mark2741 View Post
I bought a house last year that we love but one issue - the attached carport's concrete is sloping towards the house and during a heavy rainfall the rain comes in under the carport's roof and pools up in the middle, and eventually when the pool gets too big the water runs towards the house. Some penetration is occurring into the basement.

I was hoping there might be a way to add a drain in the center. Is it just a matter of getting a big ole concrete drill bit (I wouldn't be doing this myself - I would hire someone), drilling down, and then inserting a round metal drain? I assume it can drain directly down into the ground?

Any idea on whether this makes sense and, if so, costs? If this is a lame-brained idea, then aside from ripping out the carport (which I cannot afford to do), what are my alternatives other than constantly going out there and sweeping the water away when it rains hard?
No, , you cut can't just drill a hole and let the water go into the ground. That would be ill advised.
One solution would be to reposition the slab by mudjacking the low side. Not a DIY project and a little pricey for what's needed
Or:
If the slab is higher then one side of the surrounding ground, you could cut grooves(1/8" deep) into the slab parallel to the house so the water would be directed towards the front and back of the carport. Two or 3 grooves should do it unless there's a lot of water.
Or:
You could install a linear drain parallel to the house and pipe the water to a small drywell. The slab would need to be cut through to install the drain.
Ron
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Old 04-18-2011, 04:30 PM   #7
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Adding drain(s) to concrete floor in carport?


Where we live it is illegal to place just a drywell or drain ending in the ground in a garage or carport. This is due to enviromental reasons, any oil or other fluids that may drip would just contaminate the ground. You may put in a drain aslong as the water has an opprotunity to reach the street. Just a thought.
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Old 04-18-2011, 04:58 PM   #8
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Adding drain(s) to concrete floor in carport?


If you can't add a drain or whatever, at the very least make some kind of barrier at your house. Like a little concrete curb or something!
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Old 04-19-2011, 05:27 AM   #9
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Adding drain(s) to concrete floor in carport?


good point & 1 i hadn't considered since neither vehicles nor bikes leak/drip/snort/fart/burps,,, i'll find a liner, collect whatever runs into it, & dump it in an environmental conscious manner ( over the fence on a dark nite ! )

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