Brick Chimney Leaking Through Brick?

 
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Old 03-19-2010, 07:20 PM   #1
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Brick Chimney Leaking Through Brick?


Hi all, I am new to this site, 30 yrs in the building industry.
I put this in the masonary section too, not knowing who might have seen this.
Last August i replaced a roof on a simple ranch house. We used 30 yr architect grade shingles. About a week ago the homeowner called me and said his roof was leaking! I made arrangements to go pay him a visit and low and behold the chimney block was wet inside the attic!
The chimney is a cinderblock double with brick laid from the roofline up and out. It is in pretty bad shape, all lead up flashing and step flashing was replaced. I am having a hard time convincing the HO that the brick are actualy letting the water in and not the flashing. The mortar joints are cracked and there is even pieces of brick missing. I think over the winter with lots of freezing and thawing that the brick have gotten worse or bad enough to let the water in behind the flashing. We had incredible amounts of rain last fall and no leaking.
Just curious if anyone has ever seen this problem? Also to note, the brick were stepped out over the cinderblocks to make the chim, look bigger i guess?
thanks,
dave
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Old 03-19-2010, 08:29 PM   #2
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Re: Brick Chimney Leaking Through Brick?


Construction dictates an air gap of 2" to combustibles. So walls surrounding the chimney never gets close enough to the masonry to show water through it. Any water getting in will soak down the chase into the footing itself. So water leaks from masonry rarely come to the forefront. If your chase is not enclosed or it is corbeled off center these issues will show up. If brick is missing or that corroded they like have updated they're furnace to a higher efficency or added more stuff to that chimney which it cant handle. Higher efficency's dont lose enough heat to escape up the chimney so they condense up the shaft and corrode.

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Old 03-19-2010, 08:31 PM   #3
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Re: Brick Chimney Leaking Through Brick?


Seen this once in a dozen or so years. Reshingled and flashed around the giant chimney then went back again and did it again, still leaked. Finaly found the water to be getting in via the brick/motor joints. It's was nice to see the end to the problem as I'd exhausted all my profit on the job by return trips and finaly ripping it apart again.

Guess I stood behind my warranty a little to good!
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Old 03-19-2010, 08:45 PM   #4
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Re: Brick Chimney Leaking Through Brick?


yeah, i've redone all the up flashing already, even though i didn't realy think that was where the problem was. I am going to take a hose to it this weekend and just hose around the base just to prove my flashing isn't leaking.
I hate this, I have done many roofs and have had many customers over the years and this is the first time i have ever been called back for something like this.
I never get called back for anything being wrong or faulty!!
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Old 03-19-2010, 10:25 PM   #5
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Re: Brick Chimney Leaking Through Brick?


chimmney cap>?....water may be going down flue and finding a bad joint and goin from there...cracked flues?
have seen cracked flus leach chimmney soot right through exterior stonework...turns black..
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Old 03-20-2010, 04:46 AM   #6
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Re: Brick Chimney Leaking Through Brick?


Hi, Perhapes you need to fit a damp proof course of lead to your chimney?
Have a look at this , and you will see what i mean, hope it helps
Cheers
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http://justlead.co.uk/news/Page-2.html
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Old 03-20-2010, 06:32 AM   #7
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Re: Brick Chimney Leaking Through Brick?


interesting!
maybe i'll show that to the HO
also someone had installed a stainless flue liner for a woodstove in one flue. the cap they put on is not sealed, all the concrete around the top is cracked and missing and there is no poured cap to speak of, nothing with an overhang.

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Old 03-20-2010, 07:42 AM   #8
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Re: Brick Chimney Leaking Through Brick?


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Originally Posted by dave_dj1 View Post
all the concrete around the top is cracked and missing
There's your huckleberry.

Needs a new wash/crown or a full chimney cover.The water is entering at the top and by-passing your flashing.
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Old 03-20-2010, 08:03 AM   #9
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Re: Brick Chimney Leaking Through Brick?


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Originally Posted by seeyou View Post
There's your huckleberry.

Needs a new wash/crown or a full chimney cover.The water is entering at the top and by-passing your flashing.
SeeYou could be right, in the past with chimney leaks i have always started from the top, over here where the pot or flue comes out of the chimney it is normally bedded on with sand and cemnet which tends to get pourous or flakey over the years, if replacing that doesnt work,we then seal it with a water sealent paint, usually re-point the chimney as well, then water seal the brick work with thompsons water seal.
If that doesnt work and it doesnt have a damp proof course of lead then this is where it gets expensive because to fit one of them the chimney needs to be taken down to just above the flashings,dpc fitted then the chimney need to be rebuilt!
Good luck with it.
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Old 03-20-2010, 09:45 PM   #10
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Re: Brick Chimney Leaking Through Brick?


A little bit of both worlds

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Old 03-21-2010, 12:15 AM   #11
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Re: Brick Chimney Leaking Through Brick?


Once the brick gets saturated with water, any additional water will wick through. It will look like the brick is sweating, looking at it from in the attic.
Was it a wetter than normal year?
When it dries out use a good sealer and should fix the problem.
This assumes you ruled out the roofing and flashing.
It rains all the time here and have seen this many times.
You're not going to find a good sealer at HD talk to your mason.
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Old 03-21-2010, 05:23 AM   #12
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Re: Brick Chimney Leaking Through Brick?


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Originally Posted by red_cedar View Post
A little bit of both worlds

I cant say i have ever seen it done like that but i like it, nice work!
oh i hope you patinated the lead to stop it streaking down the brick work lol
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Old 03-21-2010, 07:33 AM   #13
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Re: Brick Chimney Leaking Through Brick?


No, I didnt. Had not heard of pre- patinaing lead before I looked at the video.
Theres a concrete cap drip edge. Its different I know, but copper would have not looked any better, unless it was a decrative box type of cap.

With regard to the through pan that is done over by you. Waterproofing wise could not do better. I would think though that the metal would weaken the structure ( chimney) at that point. The mortar bound is broken.

I do smaller brick chimneys and if I dont allow for some masonry to masonry bond with regard to built in even counterflashings, the joints that are involved are weak.


That lead work over acroos the pound is something else though.

Last edited by red_cedar; 03-21-2010 at 08:11 AM. Reason: just added a couple more thoughts.
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Old 03-21-2010, 11:49 AM   #14
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Re: Brick Chimney Leaking Through Brick?


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Originally Posted by red_cedar View Post

With regard to the through pan that is done over by you. Waterproofing wise could not do better. I would think though that the metal would weaken the structure ( chimney) at that point. The mortar bound is broken.

I do smaller brick chimneys and if I dont allow for some masonry to masonry bond with regard to built in even counterflashings, the joints that are involved are weak.
The pull of gravity is still strong, though. I've through flashed many chimneys and none of them have gone flying off the roof yet.
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Old 03-21-2010, 01:44 PM   #15
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Re: Brick Chimney Leaking Through Brick?


Quote:
Originally Posted by red_cedar View Post
No, I didnt. Had not heard of pre- patinaing lead before I looked at the video.
Theres a concrete cap drip edge. Its different I know, but copper would have not looked any better, unless it was a decrative box type of cap.

With regard to the through pan that is done over by you. Waterproofing wise could not do better. I would think though that the metal would weaken the structure ( chimney) at that point. The mortar bound is broken.

I do smaller brick chimneys and if I dont allow for some masonry to masonry bond with regard to built in even counterflashings, the joints that are involved are weak.


That lead work over acroos the pound is something else though.
As regards to the through the pan i can see what you mean about it weakening the chimney structure but it doesnt seem to be the case in any i have seen or done, remember theres normally alot of bricks and motar above the lead pan point, so it doesnt tend to shift.
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Old 03-21-2010, 04:45 PM   #16
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Re: Brick Chimney Leaking Through Brick?


well i covinced the HO to have a chimney specialist to come in and look at the chimney and then fix it if the expert advises. I told him i have done all i can and am willing to do.
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Old 03-21-2010, 07:27 PM   #17
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Re: Brick Chimney Leaking Through Brick?


hope it works out for the homeowner.

with regard to my posts and spelling, it has a lot to be desired!
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Old 03-23-2010, 10:32 PM   #18
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Re: Brick Chimney Leaking Through Brick?


I used this product over ten years ago and still do. It stopped water dead in it's tracks. I had the same problem with a chimney. Relaced flashing and re-crowned and still let water in. Chimney saver was the answer.www.ChimneySaver.com
This product will not seal the chimney.



  • 10 Year Warranty
  • 100% Vapor Permeable
  • Environmentally Friendly
  • Non Glossy Look
  • Efflorescence/Stain Protections
  • Mildew/Fungus Resistant
  • Freeze/Thaw Protection
  • Water-based and Environmentally Friendly
According to the Brick Industry Association, chimneys require special attention and maintenance to prevent costly damage caused by water penetration. Because chimneys project above the roof line, they are vulnerable to the elements. Nearly every chimney you encounter has signs of water damage! The first step is to determine the cause and then find the best corrective measures. ChimneySaver, the first product developed specifically for chimneys, has been used successfully by leading chimney professionals for nearly 20 years. It reduces water penetration into the masonry by 99.9%, according to ASTM tests conducted at the University of Wyoming.
It’s also 100% vapor permeable, which means it won’t trap water vapors that may pass through the bricks when the chimney is in use, unlike other products found in most hardware or home improvement stores. Those products when applied to a masonry chimney can actually slow down water vapors as they pass through the chimney leading to water damage.
Whether to use Water-Base or Solvent-base
ChimneySaver is available in both solvent (mineral spirits) and water-based formulas. The water-based formula is most popular, however, if a water repellent has previously been applied to the masonry, we recommend the solvent-based formula.

Moisture from a variety of sources is always present in masonry and concrete. Sealers and silicone coatings form a water resistant surface film which trap water vapors inside. If these vapors cannot escape, they will contribute to spalling, scaling, deterioration, and freeze-thaw damage. ChimneySaver is 100% vapor permeable - a non film-forming water repellent that penetrates and lines masonry pores.




Neil

Last edited by flippinfool; 03-23-2010 at 10:39 PM. Reason: more info
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Old 12-12-2011, 03:57 PM   #19
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Re: Brick Chimney Leaking Through Brick?


Chimney brick leaks are due to old or bad mortar and/or old bricks. The bricks are exposed to the harshest of the elements and become porous.

An easy and reliable fix is to spend $10.00 on a gallon of Thomson's General Purpose Water sealer and coat the entire chimney including the cap with it.

Works for me!
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Old 12-12-2011, 06:08 PM   #20
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Re: Brick Chimney Leaking Through Brick?


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Chimney brick leaks are due to old or bad mortar and/or old bricks. The bricks are exposed to the harshest of the elements and become porous.

An easy and reliable fix is to spend $10.00 on a gallon of Thomson's General Purpose Water sealer and coat the entire chimney including the cap with it.

Works for me!
Only 18 months late...

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