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Old 08-20-2013, 09:34 PM   #1
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Caulking question


I have a concrete balcony over metal sheathing supported by metal crossbeams. Water has been seeping through gaps in the front of the deck between the concrete and beam where rain water rolls off. It seeps through the back of the beams and causes corrosion and paint damage. I have cleaned out, sanded, primed with rust converter and caulked the front with silicone II.

My question is should I caulk the back or leave it open in case any moisture makes it through the front so it can dry out?
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Last edited by r1racer; 08-20-2013 at 09:44 PM.
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Old 08-21-2013, 10:30 AM   #2
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Caulking question


anyone?

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Old 08-21-2013, 12:08 PM   #3
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Caulking question


Is the middle picture the inside view?
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Old 08-21-2013, 12:25 PM   #4
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Caulking question


Middle picture is underneath the balcony (other side of the beam in first two pics). I removed all of the old caulk.
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Old 08-21-2013, 12:47 PM   #5
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Originally Posted by r1racer View Post
Middle picture is underneath the balcony (other side of the beam in first two pics). I removed all of the old caulk.
Being you've "fixed" the leak. Let it breath. If you clean up the underside of the balcony; any future 'leaking' should be come noticeable. Hopefully the concrete is not saturated and migrating the water. Is the metal a pan that the concrete was poured into? e.i. Open riser metal pan steps that you'd see on the exterior of a hotel or commercial building?
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Old 08-21-2013, 02:17 PM   #6
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Caulking question


Makes sense. It's possible that moisture is getting through the concrete as well but I am pretty sure 90% was from the uncaulked gaps. Whoever painted last only caulked underneath the balcony and it wasn't silicone.

Not sure what kind of pan but the underside has metal beams running every 16 inched or so. The original builder was a commercial contractor so it's possible.

Thanks for your help.
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Old 08-21-2013, 05:25 PM   #7
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Caulking question




Just some food for thought...
Concrete is just a rigid sponge, like electrons; water follows the path of least resistance and as such - it if really hard to in point the source of the "leak".

With everything you've already done - a good insurance policy would be to seal the surface of the concrete porch slab. I have a couple personal preferences for products; but posting them wouldn't be proper, here. One is acrylic and does a pretty good job for a couple years, the other is a silicone alkyd based product that I discovered about 25 years ago that I've seen last for 2 centuries and still looks nearly as good as it did when it was applied - its' lost a little bit of its' shine. Only problems with the latter, are:
you can't maintain it it with anything but itself - nothing will adhere properly
and hope they NEVER go out of business - see the next bullet...
they are now owned by XXX and the $ has sky-rocked in the past couple years.

As for the acrylic one; it was mentioned in another post by brand name, I'll reserve my opinion on the recommended application directions offered. The one named WOULD NOT work; in your case, but another product in their line would.
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Old 08-21-2013, 08:38 PM   #8
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Do you mind PM the brands?
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Old 08-22-2013, 01:13 AM   #9
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Originally Posted by ask4dan View Post


Just some food for thought...
Concrete is just a rigid sponge, like electrons; water follows the path of least resistance and as such - it if really hard to in point the source of the "leak".

With everything you've already done - a good insurance policy would be to seal the surface of the concrete porch slab. I have a couple personal preferences for products; but posting them wouldn't be proper, here. One is acrylic and does a pretty good job for a couple years, the other is a silicone alkyd based product that I discovered about 25 years ago that I've seen last for 2 centuries and still looks nearly as good as it did when it was applied - its' lost a little bit of its' shine. Only problems with the latter, are:
you can't maintain it it with anything but itself - nothing will adhere properly
and hope they NEVER go out of business - see the next bullet...
they are now owned by XXX and the $ has sky-rocked in the past couple years.

As for the acrylic one; it was mentioned in another post by brand name, I'll reserve my opinion on the recommended application directions offered. The one named WOULD NOT work; in your case, but another product in their line would.

you can certainly post brands here
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Old 08-31-2013, 09:54 AM   #10
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Caulking question


Just an update...everything turned out great. Couldn't be more pleased. Thanks again for your help.
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Old 08-31-2013, 10:08 AM   #11
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Caulking question


Thanks for posting the "end result." So often someone asks questions and gets advice but never lets us know how it turned out. It looks great!

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