Fungal Treatment: At Bright Crest Barriers we use an environmentally friendly product that is safe for humans and pets. The product we use soaks into the wood working as a corrective and preventative. Fungal in a crawlspace is awful for numerous amount of reasons the most common type of fungal found is white fungus. White fungus grows against the wet/moist wood in the crawlspace, which can cause sagging in the joist/subfloor. Our products also help protect against Brown rot fungus among others and help prevent future infestation.