Green mold is growing on a corner of our house's brick.

threeapplesNovember 28, 2012

The gutters are in and downspouts too. Is this something to be concerned about? The brick is sand-faced so I'm not sure how to clean this off. Thanks.

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mydreamhome

Is it on a north facing side of the house/side that gets very little to no direct sunlight or is in shade all day?

    Bookmark   November 28, 2012 at 10:07AM
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threeapples

Yes

    Bookmark   November 28, 2012 at 10:52AM
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renovator8

It is probably algae or moss that can be washed off. The important issue is where is the moisture coming from. Are the bricks always damp?

    Bookmark   November 28, 2012 at 11:06AM
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kirkhall

Agree this is not a mold issue but rather an algae or moss issue.

    Bookmark   November 28, 2012 at 1:45PM
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brickeyee

A painters extension pole, an 'acid brush' and some elbow grease.

Only scrub as hard as you need to .

    Bookmark   November 28, 2012 at 3:33PM
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threeapples

Thanks. Yes, the brick there has been wet or damp for ages now.

    Bookmark   November 28, 2012 at 4:55PM
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renovator8

Find out why the bricks are damp.I suspect excessive water is getting into the cavity from above. Get someone on a ladder to look at every crack, joint and opening in the brickwork.

Also check to see if the weeps are open at the bottom of the wall and above openings.

This post was edited by Renovator8 on Thu, Nov 29, 12 at 8:17

    Bookmark   November 29, 2012 at 8:16AM
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gbsim1

Before we all start speculating, I'm curious to know what your GC and mason have said in answer to your question.

    Bookmark   November 29, 2012 at 8:32AM
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mydreamhome

North facing/areas that stay shaded all the time are prone to this, unfortunately as we found out with our last house (it had siding--so much easier to clean).

I am also curious what GC & mason have to say--but also, what does your brick manufacturer recommend you do to remove it since the brick is sand faced?

    Bookmark   November 29, 2012 at 10:52AM
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Sophie Wheeler

This is a natural and not at all uncommon occurrence for the north side of houses. They stay shady and moist, no matter what the siding material. That's perfect growing conditions for moss or algae. Some people pay really big bucks for bricks that have that growing on them as it gives a time worn appearance and is considered desirable by some. Others hate it, and are in a continual battle to scrub it off. With sand faced brick, I'd suggest that you grow to love it. Continual scrubbing of sand faced brick will just scrub the sand right off.

    Bookmark   November 29, 2012 at 12:18PM
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threeapples

our builder said they'd clean it off and it's no big deal. the mason and i did not speak about it. i doubt anyone will be willing to look for cracks between bricks, etc., but i will ask.

    Bookmark   November 29, 2012 at 9:25PM
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mydreamhome

Did the builder say how they would clean it off?

    Bookmark   November 30, 2012 at 1:48AM
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threeapples

No. I've not heard how they will clean it off. Today the mason seemed unconcerned about it. I'm going to have our builder check the weep holes next week.

    Bookmark   November 30, 2012 at 2:00PM
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threeapples

this is the least offensive area in the section where the moss/algae is growing:

    Bookmark   November 30, 2012 at 8:27PM
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