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Question DetailsAsked on 9/7/2011

How often should you Have the chimney's exterior brick sealed. How much should the sealing process cost?

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5 Answers

0
Votes

Sealing the exterior of a masonry chimney should never be done nor should the exterior be painted. A masonry chimney has to breathe. It must process moisture through evaporative processes. If you "seal" the masonry that process turns inward. Moisture then weeps to the inside systems components.This can lead to early decay of mortar and freeze / thaw cycle effects on the exterior.
The way to stop weather moisture intrusion is to first clean the exterior masonry and then apply a repellent. SaverSyatems has Chimney Saver masonry repellent. This product changes the POLARITY of the masonry surface when exposed to uv rays to match the polarity of water...therefore REPELLING moisture. This effect should last 10 years as warranted by the company. The key here is repellent not sealer. Chimney Saver is "vapor permeable" which means that it allows the masonry to breathe and continue to process other moisture exposure like combustion moisture and condensation of humidity in the dark cooler flue.
Costs should run $65-$100 to power wash the chimney
I apply Chimney Saver for $89 per gallon.
1 Gallon covers approx. 100 sq. ft. depending on thirst of the masonry. I hope this answers your question. Apply once in 10 years.

Source: http:// David Lamm /The Classic Chimney Sweep/ Saver Systems

Answered 7 years ago by David Lamm

0
Votes

ONLY EVERY TEN YEARS IF YOUR HAVING CHIMNEYSAVER APPLIED, THIS STUFF IS THE BEST. HAVING BEEN IN THE INDUSRTY 27 YEARS IVE SEEN NOTHING BETTER.


SingingSweep

Circleville,Oh

Answered 5 years ago by Singingsweep

0
Votes

The chimney brick can be sealed as long as the sealant you are using is the proper application.


You want a penetrating sealant that will keep out the bulk moisture while allowing the brick to "breathe" and dry to either side.


There are penetrating sealants that have this very property and are specified for just this type of application.

Answered 4 years ago by WoWHomeSolutions

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Votes

Sorry, I do not have the answer, but a follow-up. WoWHomeSolutions stated that there are penetrating sealants that allow the brick to breathe. Can someone provide some sample product names/manufacturers that are appropriate for sealing brick chimneys?


I do have a brick chimney and it has moss growing on the mortar. I do not know what to do about it (how to remove the moss without removing the mortar), what "specialist" to call to help, particularly if the mortar needs to be replaced/filled up, if a sealant is recommended, etc. Where can I find reliable answers to the above? Thanks in advance.

Answered 3 years ago by sfs

0
Votes

Try Rainguard Micro-Seal, for a product that repels and breathes. They sell a cheaper version called Blok-Lok, but it's worth it to pay a little more for this. You can get it from Amazon.

Answered 2 years ago by Guest_90247641




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