Does bleach kill mold?
Thursday, July 19, 2018
“Bleach doesn’t kill mold, it just annoys it,” according to one mold remediation contractor we know. Actually, chlorine bleach can kill mold on a non-porous surface like glass or metal; but, because it is a plant-like growth with a root system that embeds in porous materials like drywall and only the moisture in the bleach reaches into the material, bleach just kills the top part. Most mold problems occur on porous surfaces, and this is why it will stubbornly reappear on a many surfaces treated with bleach after a few weeks.
Also, bleach is corrosive. Whey sprayed on wood roof trusses to kill a mold growth, any bleach that gets on the metal gusset plates that connect the truss members will destroy the galvanization and accelerate corrosion of the plates.
But there are a number of alternatives such as borax, ammonia, hydrogen peroxide, and multiple proprietary chemicals to choose from, plus numerous websites online with instructions for applying each of them.
Also see our blog post Is mold contagious? Can mold spread to my home if there is a nearby house with mold?
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