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Expanding foam to fix basement leak? #4563649
11/04/17 07:10 AM
11/04/17 07:10 AM
Joined: Jan 2009
Posts: 2,472
Rochester, MI, US, World
Klutch9 Offline OP
Klutch9  Offline OP
Joined: Jan 2009
Posts: 2,472
Rochester, MI, US, World
A house we recently purchased has a couple of small leaks in the basement. Well, not strictly 'in' the basement, but under the front and back porches (which are cellars). The cellars are accessed by man doors, and have block walls on 3 sides; the fourth side is also block wall, but is the outside of the actual basement walls. Above each cellar is a concrete porch, both of which have recently been decked over with wood. They did a nice job, and both decks do slope away from the house slightly. Of course, I have no idea what the original concrete porch does underneath, and I really don't want to rip up both porches to find out. What I can see in both cellars is that where the concrete porch meets the outer basement wall, there is a thin fir strip in between... that's it. No Sealant of any sort. That's where there is a slight leak. The other 3 sides of each cellar all have what looks like tar paper where the wall and porch underside meet.

So with that being said, I was thinking of caulking or spraying some waterproof expanding foam from the underside to stop the leak into the cellar. From what I can see, this would not trap any water. Rather it would eventually force it off to one side or the other, where it would just fall to the ground outside. Does this sound plausible? Thankfully these are storage cellars and not liveable space, but a leak is a leak and I want it gone!


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'08 Sedona LX LWB 3.8L - 129k miles - Havoline HM 5w20, Auto7 filter
Re: Expanding foam to fix basement leak? [Re: Klutch9] #4563715
11/04/17 08:37 AM
11/04/17 08:37 AM
Joined: Mar 2004
Posts: 21,115
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 21,115
Upstate NY
You want hydraulic cement that is designed for this purpose. You may need to grind the cracks. Read directions.


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Re: Expanding foam to fix basement leak? [Re: Klutch9] #4563724
11/04/17 08:43 AM
11/04/17 08:43 AM
Joined: Oct 2002
Posts: 22,168
Colorado Springs
Drew99GT Offline
Drew99GT  Offline
Joined: Oct 2002
Posts: 22,168
Colorado Springs
Or try Sikaflex concrete fix if the gap isn't really huge; that stuff is amazing and easy for small problems like this. Stays flexible for years and years. Best concrete caulk you can get IMO.

Last edited by Drew99GT; 11/04/17 08:44 AM.
Re: Expanding foam to fix basement leak? [Re: Drew99GT] #4563730
11/04/17 08:50 AM
11/04/17 08:50 AM
Joined: Nov 2004
Posts: 7,803
Texas
GMBoy Offline
GMBoy  Offline
Joined: Nov 2004
Posts: 7,803
Texas
Originally Posted By: Drew99GT
Or try Sikaflex concrete fix if the gap isn't really huge; that stuff is amazing and easy for small problems like this. Stays flexible for years and years. Best concrete caulk you can get IMO.


Another vote for concrete caulk.

Re: Expanding foam to fix basement leak? [Re: Klutch9] #4563759
11/04/17 09:30 AM
11/04/17 09:30 AM
Joined: Aug 2003
Posts: 13,141
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,141
NE,Ohio
Sounds like a perfect job for flex seal.


2019 Jeep Cherokee Trailhawk 2.0T
Re: Expanding foam to fix basement leak? [Re: Klutch9] #4563805
11/04/17 10:05 AM
11/04/17 10:05 AM
Joined: Dec 2016
Posts: 7,151
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,151
Waco, TX
Try improving drainage away from the house, if you can.


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Re: Expanding foam to fix basement leak? [Re: Klutch9] #4563828
11/04/17 10:25 AM
11/04/17 10:25 AM
Joined: Dec 2006
Posts: 627
Lynchburg, Va
JasonC Offline
JasonC  Offline
Joined: Dec 2006
Posts: 627
Lynchburg, Va
Also, flexible spray rubber can help as well. I used it in my basement where my main water line comes through. It has stopped all water from coming through plus, it's clear so if I didn't tell you you would never notice.


2012 Buick Verano 2.4
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Re: Expanding foam to fix basement leak? [Re: Klutch9] #4563890
11/04/17 11:23 AM
11/04/17 11:23 AM
Joined: Aug 2015
Posts: 128
Central NY/Arkansas
avacado11 Offline
avacado11  Offline
Joined: Aug 2015
Posts: 128
Central NY/Arkansas
A lot of times sealing the leak only ends up with new leaks. Try to drain the water away first then seal the crack with caulk. I used to have issues with water going into my basement so I ended up digging a small 6" deep trench that ran along the outside wall and drained the water away from the house. Haven't had an issue yet. You can fill the trench with loose gravel if it gets in your way.


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