» dose any one spray silicone on older chimneys to stop leaks?

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  Post subject: dose any one spray silicone on older chimneys to stop leaks?
PostPosted: Sun Apr 04, 2010 3:22 pm 
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dose any one spray silicone on older chimneys to help stop leaks? i know it's not the right way to fix it but have seen it done on structurally sound chimneys to seal them up for a bit till a new one can be paid for. on most roofs i do i put new lead or copper and there is always new step put in with ice and water or grace under that. but when the mortar is falling out or some bricks have cracks in them some thing els needs to be done.

if any one does this let me know what you use for silicone and to spray it. thanks.

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PostPosted: Sun Apr 04, 2010 4:29 pm 
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Wadman 1,

There are a lot of different chimney water repellents.
Rarely this is the cause of the leak, but I have seen some porous brick soak up water and cause leaks especially with wind driven rain. http://www.weathertiteindustries.com/FlexibleCrown.htm
has the chimney protection we use. It is breathable. This is important because the sealants that aren't cause the brick to spall or break up into little pieces.
A more common area that causes leaks is chimney crown. The crowns are always cracked. One reason is a lot of workers that build the chimneys make the mistake of using the same mortar that they use to lay the brick for the crown also. You need to use a cement rather than mortar for the crown. The crown is to thick for mortar and always cracks after a few years.
Chimneysaver.com has a lot of excellent information on chimneys, and some unique products. The products at weathertite industries are also available thru ABC Supply.

Onarooftop

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PostPosted: Mon Apr 05, 2010 1:00 am 
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Would siding the chimney be an option? Done a few that way and installed a metal cap

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PostPosted: Mon Apr 05, 2010 2:46 am 
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I guess that is a preference thing. Some
homeowners like the brick looking chimney.
It is becoming a little more common to have
the homeowner say, "Just take it out, it isn't in use anyhow"

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PostPosted: Mon Apr 05, 2010 2:52 am 
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See what it cost to have a mason repoint it or get a price from some restoration contractors and then seal it with some waterproofing products.


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PostPosted: Tue Apr 06, 2010 3:46 pm 
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On old brick work, it may actually be a requirement. The mortar may need re-pointing, and even then you may still have a problem with old porous brick. It is becoming more common here in Texas to need and use brick sealers. Most of our brick isn't nearly as old as much or yours.

And I second the advice to check the crowns. We just replaced two crowns on two big chimneys. One was starting to crack apart, and the other had long ago collapsed down into the void between the flue and the chimney facade. This house probably cost a half-million to build and they used plywood-under-mortar for the crowns - go figure.


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PostPosted: Tue Apr 06, 2010 5:09 pm 
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around here a lot of chinmeys are pan "thru wall" flashed. thats really the best way. the pan is abouve the roof line and goes all the way through with weep holes. sealer never works long term. they also recomend waterstruck brick as it is less porus.

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PostPosted: Tue Apr 06, 2010 7:41 pm 
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have you all seen the lead caps they are making ?never used one but seems like a great idea

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PostPosted: Tue Apr 06, 2010 8:37 pm 
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thanks for all the tips. this was not for a specific chimney, it was a general question. a lot of home owners cant come up with the money for a roof so a new chimney is out of question.

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PostPosted: Wed Apr 07, 2010 3:18 am 
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why is it out of the question ? thats what they need a lot of the time to solve there problem. Find a mason that knows about pan flashing.

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PostPosted: Wed Apr 07, 2010 4:27 am 
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Whatever coating you use, be sure that it is a breather. Silicone is a breather.

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PostPosted: Wed Apr 21, 2010 1:28 am 
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How do you know Chimney savers?
sorry for the random q.


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PostPosted: Fri Apr 23, 2010 5:21 am 
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What does it mean by the chimney savers, Its the first time I have heard about the chimney savers. Can some one tell me about the chimney savers, what are these?


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PostPosted: Sun Apr 25, 2010 6:31 pm 
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http://www.chimneycricket.com/chimney-r ... oducts.htm


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PostPosted: Mon Apr 26, 2010 1:07 am 
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I think I could work for RooferJ. He likes to do stuff right.

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