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Old 04-08-2013, 12:57 PM   #1
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Blackjack roofing cement, For Foundation walls.


Hi all, I'm a new member here and have a question roofing cement for a foundation wall.

I have a water leak in my foundation wall and I tried to stop it by using Blackjack roofing cement it's also rated for below grade foundation walls , I used that along with roofing fabric.

The wall construction is brick.


Here's the steps I used : I first cleaned the wall then applied about 1/8" layer of tar then added fabric then applied another coat of tar .I still have a leak can you please tell what I did wrong ? Should I add another coat and fabric ?

Thank you advance

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Old 04-08-2013, 01:05 PM   #2
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Blackjack roofing cement, For Foundation walls.


Nothing wrong with what you did. That is the correct application. Now you just have to find the leak and do the same thing.

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Old 04-08-2013, 03:04 PM   #3
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Blackjack roofing cement, For Foundation walls.


Thanks for your fast reply Broken, The funny thing is when I look at leak from under my crawl space I took a measurement of location and carried that to the outside wall and marked the location where is leaking. I guess it's running from somewhere else .
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Old 04-08-2013, 05:13 PM   #4
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Foundations can be tricky. Hopefully it's an isolated area. Otherwise it's sealing repairing and sealing the entire foundation and I'm sure you don't want to go there.
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Old 04-08-2013, 06:03 PM   #5
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Blackjack roofing cement, For Foundation walls.


greatpapasmurf -

You are seeing where the water is showing up inside. That is not necessarily where the leak is.

Water obvious goes down, but it can easily travel horizontally (up to 75' in a structure) and also upward thanks to capilary action and surface tension.

Step back a few feet and look and try to figure out where the water may be coming from.

Dick
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Old 04-08-2013, 11:20 PM   #6
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Originally Posted by concretemasonry View Post
greatpapasmurf -

You are seeing where the water is showing up inside. That is not necessarily where the leak is.

Water obvious goes down, but it can easily travel horizontally (up to 75' in a structure) and also upward thanks to capilary action and surface tension.

Step back a few feet and look and try to figure out where the water may be coming from.

Dick
Thanks for your fast reply Concretemasonary , I'll look around some more.
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Old 04-08-2013, 11:33 PM   #7
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I am not a foundation specialist but shouldn't a dimple board be applied after all the sealing to ensure a water tight apllication?
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Old 04-09-2013, 07:03 AM   #8
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Blackjack roofing cement, For Foundation walls.


what about your french drain? if you don't have one time to put one in.
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Old 04-09-2013, 07:33 AM   #9
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Did you just try and fix one small area, or along that whole wall?
Did you go all the way down to the and out over the footing?
Do you have gutters, a grade that runs away from the foundation?

If there's any mulch piled up againt the foundation or flower beds forming ponds up againt it they need to go.
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Old 04-09-2013, 03:16 PM   #10
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It would be nice to have the dimple board, but I called a few building suppliers before I started . Their reply was they never heard of it or never heard of anyone waterproof basements or crawl spaces in Florida.I bit they'll look into now,lol.Thanks for your reply.
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Old 04-09-2013, 03:29 PM   #11
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Originally Posted by joecaption View Post
Did you just try and fix one small area, or along that whole wall?
Did you go all the way down to the and out over the footing?
Do you have gutters, a grade that runs away from the foundation?

If there's any mulch piled up againt the foundation or flower beds forming ponds up againt it they need to go.
I wish I could poster pictures here. Anyways Thank you for your reply. I live in Northwest Florida 30 mins. from Alabama I dug down below the footers for about 10',No flowers or mulch in the area.No gutters but will have them installed soon.I just graded the area away from the foundation it falls 3" in four feet.I hope that's enough ?
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Old 04-09-2013, 03:35 PM   #12
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what about your french drain? if you don't have one time to put one in.

I was thinking about that,Nailbags.It looks like I'll be doing that as well.
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Old 04-09-2013, 03:37 PM   #13
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Originally Posted by bcgfdc3 View Post
I am not a foundation specialist but shouldn't a dimple board be applied after all the sealing to ensure a water tight apllication?

It would be nice to have the dimple board, but I called a few building suppliers before I started . Their reply was they never heard of it or never heard of anyone waterproof basements or crawl spaces in Florida.I bit they'll look into now,lol.Thanks for your reply
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Old 04-12-2013, 02:10 AM   #14
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hmm weird.
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Old 04-12-2013, 11:39 AM   #15
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Blackjack roofing cement, For Foundation walls.


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Originally Posted by OldNBroken View Post
Nothing wrong with what you did. That is the correct application. Now you just have to find the leak and do the same thing.
If you want roof cement to stick to something like this, you have to prime the surface with ASTM D-41 asphalt primer first, and let it dry. It sounds like you are shooting in the dark though.

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