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tperez

05:14PM | 11/26/04
Member Since: 09/24/04
128 lifetime posts
Bvbasement
The front porch of my home faces to the north. When it rains the concrete gets a line of a white chrystaline substance next to an expansion joint. There is a water or at least it look like a water stain there.

Can you tell me what this stuff is and how to get rid of it so it won't come back.

I should mention also that it goes away on it's own but always comes back when it rains. I'm thinking some kind of mold or other fungus. Any concrete people know what this is? Thanks in advance.

U.S.M.C. Semper Fi !!!

theeagle

08:01PM | 11/28/04
Member Since: 11/27/04
172 lifetime posts
phosforesence or salts in the concrete.

but usually should not show up like that but according to your description it is. scrub with some muriatic acid (big caution) and clean the area to hopefully remove the surface salts.


tperez

08:21AM | 11/29/04
Member Since: 09/24/04
128 lifetime posts
theeagle,

Thank you for the reply. I will certainly give it a try.

U.S.M.C. Semper Fi !!!

Glenn Good

05:22AM | 12/04/04
Member Since: 09/10/03
314 lifetime posts
I’m sorry for correcting you theeagle but it is not “phosforesence” or “phosphorescence” it is efflorescence. The muratic wash should remove it but will not prevent its reappearance. To prevent it from coming back you must find the areas where water is getting into the brick wall (cracks, poor flashing, etc.).

Water getting into the wall is dissolving the salts in the mortar and then they will crystallize (or bloom) on the surface where the solution dries. Find the areas where the water is getting into the wall and seal them and you should eliminate the problem from reappearing.

Glenn

Moderator: Construction Systems, Foundations, and Masonry & Stone

For more information about me and/or my qualifications please visit my website at:

www.consultationdirect.com

theeagle

03:43PM | 12/04/04
Member Since: 11/27/04
172 lifetime posts
i know fancy long words. efflorescence. thats one i keep getting screwed up. thats why there is a forum of lots of knowing people around.

.

i've got to proofread my writing better.


Glenn Good

06:17AM | 12/05/04
Member Since: 09/10/03
314 lifetime posts
No problem theeagle. We all make mistakes. I just try to correct them when I notice them.

Good to have you on board.

Glenn

Moderator: Construction Systems, Foundations, and Masonry & Stone

For more information about me and/or my qualifications please visit my website at:

www.consultationdirect.com
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