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Unread 12-31-2016, 10:21 AM   #1
argile tile
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Join Date: Dec 2016
Posts: 101
quick: latex mortar and mold - yes or no?

Does mold eat latex in latex-modified thinset in time? Will it turn tan with age?

Mold eats latex in time (ie, caulk or paint). If Latex Modified Mortar (white) (good bond strength) is used to whitewash a pitted old concrete wall, will I expect the whitewash will turn tan (eventually have mold eating the latex) and loose it's bond strength? Keep in mind it will be in a moist and dark environment with no airflow (because insulation will be blocking airflow to room, and moisture will be locked in, foam insulation).

((I just whitewashed a portion of a wall with "a good bond strength latex modified white mortar". Stuck real good (filled pinholes like mud) even where scraped thin. (the grey thinset test area: depends on depth). I'm wondering if I will now haven an eventual mold issue where the whitewash was done.))
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Unread 12-31-2016, 11:10 AM   #2
argile tile
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(the other possibility is: because white mortar may well have some/more lime and is bonded chemically close to the latex, the mold simply wont be able to get at the latex, chemically, lime eats mold per say)
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Unread 12-31-2016, 11:25 AM   #3
Veteran DIYer- Schluterville Graduate

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Location: Nashua, NH
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One of the selling points of Schluter's Kerdi showers is that it is done with entirely inert and organic free materials. No outgassing, no organic materials (at least that are mold food!). Mold can form on it, but only after it has been contaminated with more suitable food.

Mold requires three things: food (latex is a food to mold - maybe not a great one, though), moisture, and the mold spores themself. The pH of cement helps to prevent mold, but not forever.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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