mold

A friend has an attached unheated garage in a newly built home. The exterior wall which sits on the poured concrete frost wall approx. 1' above concrete garage slab develops mold . It is drywall and he has tried mildew proof paint with no success. There is a lot of moisture in the garage due to the snow coming in with the car and no drain in the floor. The mold is only on the exterior wall. What is causing this and how does he stop it.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Mold needs basically three things..lack of direct sun, water, and food.
Eliminate that, and hes cured the problem...altho, now that he has it growing in its food source, complete tear out and replacement of the drywall after removing the water will be needed to completely remove it.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
<< The exterior wall <<>> develops mold . It is drywall >>
You probably mean the exterior wall is finished on the inside with drywall, right? The fix is simple. Remove the drywall completely and replace with the mildew and moisture resistant product now available at most box stores and lumber yards. Finishing with fiberglass tape and a setting type mud will add even more mold resistance. Conventional drywall compounds contain good mold nutrients (PVA, etc.) and paper tape being mainly cellulose is a mold food, too. Might be a good idea to treat the wood structure while its exposed with something like Cuprinol. That should put an end to the problem, HTH
Joe
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.