Sealing Stone Vaneer / Brick Chimney


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Old 07-13-14, 07:48 AM
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Sealing Stone Vaneer / Brick Chimney

I have a brick chimney. There is a stone vaneer type fašade on it. It appears to get soaked when there is heavy rain and I think its passing water.

I would like to use a spray/paint sealant on it. What is the proper material to use? Hopefully something I can get locally at a big box store.

Thanks.
 
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Old 07-13-14, 03:48 PM
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I would first make sure of your assessment of the origination of the water. Chimney could be leaking at the crown where the flue passes through the top or it could be a flashing issue. You may be getting water down the flue and if there are any transition points in the flue, water could be seeping through the flue lining joints.

If it is a certainty that the chimney is getting saturated from rain and you decide to seal the masonry, check out RTV Silicone water repellant which is used by many chimney repair services for the issue you describe.
 
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Old 07-13-14, 04:37 PM
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If the chimney was getting saturated, can you guess how the leak would appear on the interior of the home?

Is it more likely I would see a leak in this case in the attic, or down at the bottom of the chimney like in the basement/cleanout?
 
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Old 07-13-14, 05:30 PM
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Where are you seeing evidence of the water damage?

You can try covering the flue and crown in a rain storm to see if there is an effect.

Usually a flashing issue will show up in the attic, look for water stains on the sheathing or the masonry at the perimeter of the chimney in the attic.
 
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Old 07-14-14, 06:56 AM
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Where are you seeing evidence of the water damage?
I see water infiltrating in the attic at the downhill corners of the opening for the chimney.

check out RTV Silicone water repellant which is used by many chimney repair services


I intend to have the flashing replaced. But would also like to use the type of sealent you mention for extra insurance/// it appears this stone vaneer is very wet during heavy rain ....

however, is that type of masonary sealant only available for contractors? I do not see anything like that while googling other than a few pages that show a product but no pricing information.
 
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Old 07-15-14, 04:20 AM
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Does anyone know where I can get this type of breathable RTV water repellant/ sealer?
 
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Old 07-15-14, 04:56 AM
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I don't remember if the paint store carries it but most masonry supply houses should.
 
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Old 07-15-14, 06:07 AM
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Professional Products | Watersealant | Graffiti |

This is "Professional Products of Kansas", they have a long track record. Don't be afraid to call them to find out how you can obtain it.
 
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Old 07-15-14, 07:01 AM
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I didn't know there were masonary supply houses.... I called the one in my area and they carry a siloxane? based sealer (38 bucks a gallon) and a silicon based sealer (68 bucks a gallon)....

Now I need to figure out which one to apply.
 
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Old 07-15-14, 07:41 AM
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Siloxane is breathable, I'm not sure that silicone is. It's always been my understanding that when sealing rock veneer the sealer needed to be breathable ..... but while I've painted my whole life, I've not had occasion to seal much rock veneer so my knowledge is kind of limited.
 
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Old 07-15-14, 08:10 AM
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I found the old box of the veneer.... it says "Stone Master Manufactered stone veneer"... it appears to be flat cuts of real stone but I wonder... does manufactured mean man made? Like will my sealer adhere to this stuff?

The directions on the box of the veneer doesn't say anything about sealing....

These are the directions of the product that was used
www.westwoodmills.com/Install_Brochure_Download.pdf
 
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Old 07-15-14, 08:54 AM
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manufactured means man made
I'd contact the manufacture and get their input.
 
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Old 07-15-14, 01:46 PM
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NEVER count on the apron/vest stores having pro materials IF they only sold to pro's, they'd be out of biz overnite.

we use prosoco's silicone siloxane on masonary - brick, stone, conc,,, it breathes but will NOT plug leaks,,, that calls for a joint sealant & closed-cell backer rod
 
 

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