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-   -   Help Identifying a problem with my brickwork (pics included) (http://www.diychatroom.com/f19/help-identifying-problem-my-brickwork-pics-included-100376/)

feroxide 04-03-2011 07:38 AM

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!

stuart45 04-03-2011 07:51 AM

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.

feroxide 04-03-2011 08:14 AM

Quote:

Originally Posted by stuart45 (Post 622197)
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?

concretemasonry 04-03-2011 08:14 AM

What kind of paint is bubbling?

Dick

feroxide 04-03-2011 08:19 AM

Quote:

Originally Posted by concretemasonry (Post 622209)
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!

tcleve4911 04-03-2011 08:23 AM

Rub some denatured alcohol on the paint.
If it comes off on the rag, it's latex. No paint on rag - it's oil

jomama45 04-03-2011 10:42 AM

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

concretemasonry 04-03-2011 11:42 AM

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.

stuart45 04-03-2011 12:29 PM

Quote:

Originally Posted by jomama45 (Post 622318)
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.

feroxide 04-03-2011 05:04 PM

Quote:

Originally Posted by jomama45 (Post 622318)
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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