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Old 04-03-2011, 07:38 AM   #1
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Help Identifying a problem with my brickwork (pics included)


Hi,

I am noticing that i have these lumps forming/bubbles on my brickwork under the paint... When i burst the bubbles they appear to be filled with a white-ish gritty powder (maybe mortar?). The interesting thing is that the bubbles are not just forming above the mortar but also in the middle of some of the bricks... Does anyone know what this is? And what i need to do to correct the issue? I planned to repaint however i think i may need to do something else to fix/correct the problem before i paint - maybe treat the bricks?

Link to Pics: http://flic.kr/ps/Wck4R

a little extra info on the wall itself.. The wall is an exterior facing wall, part of it is below ground, and in the last month the exterior part of the wall was dug out and treated to prevent moisture entering.
Any assistance would be greatly appreciated! I am just starting my mini renovations and i am new to DIY!

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Old 04-03-2011, 07:51 AM   #2
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Help Identifying a problem with my brickwork (pics included)


It's probably salts migrating to the surface caused by moisture from the ground. Where abouts is the property?
It looks like a solid wall built in English bond.

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Old 04-03-2011, 08:14 AM   #3
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Help Identifying a problem with my brickwork (pics included)


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It's probably salts migrating to the surface caused by moisture from the ground. Where abouts is the property?
It looks like a solid wall built in English bond.
The property is in Melbourne Australia of all places. I was thinking it felt lile salt, there really is quite a bit of it if it is! The exterior facing part of the wall has just been treated so hopefully that will stop the moisture... is there something i should do to treat the wall or some special paint that should be used on the wall? Im guessing its going to have to be taken back to bare brick before doing anything?
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Old 04-03-2011, 08:14 AM   #4
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Help Identifying a problem with my brickwork (pics included)


What kind of paint is bubbling?

Dick
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Old 04-03-2011, 08:19 AM   #5
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Help Identifying a problem with my brickwork (pics included)


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What kind of paint is bubbling?

Dick
Looks like Oil paint.. it was painted some time ago before i purchased the place but that would be my guess!
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Old 04-03-2011, 08:23 AM   #6
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Help Identifying a problem with my brickwork (pics included)


Rub some denatured alcohol on the paint.
If it comes off on the rag, it's latex. No paint on rag - it's oil
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Old 04-03-2011, 10:42 AM   #7
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Help Identifying a problem with my brickwork (pics included)


Certainly sounds and looks like effloresence, which is free salts migrating to the surface with moisture. On first thought, I'd speculate that the moisture is wicking up from below grade.

http://www.masonryinstitute.org/pdf/612.pdf
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Old 04-03-2011, 11:42 AM   #8
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Help Identifying a problem with my brickwork (pics included)


My first reaction was a non-breathing paint, probably oil but epoxy could be even worse. I have seen epoxy come off in 2x2 pieces plus some of the concrete surface.

The first photo shows a big bubble creating by a pressure build-up and inadequate breathing. The white must be efflorescence. Efflorescence is the growth of crystals that can create expansion and pressure that can destroy paint in both large and small areas (like pin holes).

Painting over the surface with more paint can only increase the deterioration. Even a breathing paint can be caused to not breathe by adding thickness, which decreases the permeability and creates a vapor barrier.
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Old 04-03-2011, 12:29 PM   #9
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Help Identifying a problem with my brickwork (pics included)


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Originally Posted by jomama45 View Post
Certainly sounds and looks like effloresence, which is free salts migrating to the surface with moisture. On first thought, I'd speculate that the moisture is wicking up from below grade.

http://www.masonryinstitute.org/pdf/612.pdf
Great site Joe, even tells you how to pronounce it.
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Old 04-03-2011, 05:04 PM   #10
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Help Identifying a problem with my brickwork (pics included)


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Certainly sounds and looks like effloresence, which is free salts migrating to the surface with moisture. On first thought, I'd speculate that the moisture is wicking up from below grade.

http://www.masonryinstitute.org/pdf/612.pdf

Thanks for all the info so far... I have done a little bit of reading about efflorescence and given i already have the issue there certain things i cannot change - such as the type of grout/mortar.

As my first post the exterior side of that wall was recently dug out and sealed – the council is building a park next door where before there was a car park – which should improve the moisture situation.

What I was thinking was that I should remove all the paint form the wall, then give the bricks a good cleaning/scrubbing and patch up the grouting where needed.. After this, as per the advice I have seen when reading about efflorescence, I will use some form on non-porous sealer no the brickwork then repaint…

Does this sound like a reasonable course of action to take?
Is there a particular type of paint I should use?

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