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Help! Need advice on sealing for mold in cob/cordwood wall...

 
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Hello,

Someone else started this cordwood and cob wall project years ago and I'm now trying to finish it (see attached picture). I really want to be able to seal the inside of the wall in some way to control mold (we live in a super wet area in a house with a mold history that includes this wall). The bottom half is concrete and cordwood. The top half is slip straw on the interior and is covered with cob. I really wish I could paint it with lime primer from earthpaint.net - as that is part of what we have done with the conventional walls in the house that had mold and it just sounds so easy to go that route . But I got advised to not ever paint naturally built walls because it can make the interior even moldier since it then can't breathe. Is that in fact correct...?

Or... Is a lime plaster the only thing I can do here? If so, does anyone have good recipes/video instruction resources for that? Also, does anyone have advice on what to do on the bottom half that's concrete and cordwood? I am much more concerned at this point about getting it sealed better for mold control than what it ends up looking like. And I'd really appreciate any sort of advice or direction on the subject! I am not experienced with natural building - just really need to wrap up this project best I can and try to get our house healthier than it currently is. Thank you!

wall.jpg
cob wall
cob wall
 
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Hi there, I made a natural hard breathable paint a while ago which we used here at our home on a clay render wall. If you want a good hard finish but to retain breathability for the mould issues then it might be worth a shot? I have my recipe here: https://moreecological.wordpress.com/2019/04/22/sustainable-building-blog-how-to-make-flour-clay-sugar-paint/
 
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The first thing is to find the source of the moisture that is causing the mould.
Painting / sealing may not help at all.
Either the roof leaks, something is wicking up into a wall, broken pipe.
Normally its not hard to locate.
Then carry our remedial works and the mould should disappear.
Remember that mould can be dangerous to you!!
 
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