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Waterproofing options on a slab shed

Posted on 2/13/25 at 4:41 pm
Posted by sosaysmorvant
River Parishes, LA
Member since Feb 2008
1403 posts
Posted on 2/13/25 at 4:41 pm
I have this metal shed (on slab) that continues to take on water around the edges in heavy rainstorms. The area does not drain well, but it drains fairly quickly. My problem is it backs up and "seeps" into my shed until the water has time to properly drain when we get a gully washer. 2 inches or more, or a shite ton all in a half hour.

Curious of a product to try to keep the water out. I could sandbag the area and that would probably work, but it would be an eyesore. Was thinking of a flexseal type product. Asking for recommendations that won't break the bank.
Posted by GoAwayImBaitn
On an island in the marsh
Member since Jul 2018
2622 posts
Posted on 2/13/25 at 5:02 pm to
Go along the bottom with a butyl rubber flashing tape that has a foil on the backside?
Posted by cgrand
HAMMOND
Member since Oct 2009
43086 posts
Posted on 2/13/25 at 5:13 pm to
take a picture
do the sheets run down past the slab?
Posted by weadjust
Member since Aug 2012
15480 posts
Posted on 2/13/25 at 5:23 pm to
You need to fix the yard drainage issue. If standing water is getting higher than the slab you stop it from getting in the shed.
Posted by PaBon
UPT 17th W/D
Member since Sep 2014
2072 posts
Posted on 2/13/25 at 9:25 pm to
This last suggestion is my thinking. Perhaps some light dirt work around the shed and get the water moving away. Some sort of French drain I assume.

Cgrand has a good question. If the panels run all the way down, your going to have a though time keeping water out with the only way of trying to waterproof from inside. It would only be temporary I assume.

Would be nice to see some pictures.
Posted by Spankum
Miss-sippi
Member since Jan 2007
58370 posts
Posted on 2/13/25 at 10:35 pm to
Is it possible to have someone come in and skim the slab with more concrete? That’s what I did when I had a patio flooding. Raised it about 1 1/2” and it doesn’t flood anymore.
Posted by sosaysmorvant
River Parishes, LA
Member since Feb 2008
1403 posts
Posted on 2/14/25 at 7:04 am to
quote:

do the sheets run down past the slab?

No. Seems like a remedy could help on the exterior.

I'll take a picture when I get a chance.
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