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Any ideas what this is, doesn't check out against google searches.
white markings in "pores" in 45+ year old fir floor joists. Floor over un-encapsulated crawlspace, approx 70% humidity through winter so not ideal.
Only on some joists, not all. Not much effect with concrobium..certainly doesn't disappear after wetting with it anyway. Perhaps h2o2 fogging will get it.
I assume the white has made the pores by consuming the wood, but other mould I've seen eating wood has had either more surface build up or weirdly stringy and you can tell its bad sh*t.
Will send for lab sampling at some point or should I just set a match to it now?
(posting here as I'm sure someone's an abatement expert)
My first thought is that the joist looks very smooth and shiny, is it reclaimed timber that was previously painted, maybe from a whitewashed cellar?
Has someone screwed through the floorboards?
Its probably just plain old white mold, you get it anywhere where wood sits in slightly damp air with poor ventilation I suspect its starting where it is as those are damaged parts of the timber easier to attach to. Consider putting in a vent or two to aid air flow?
That's been sanded down. Give it flick with a screwdriver and see if it's paint.
Sniff test will tell if it's mold it has a smell of its own
Not reclaimed or previously painted, it's normal mill finish lumber for north america. Straight from the lumber yard when built I expect
Airflow and encapsulating the damp ground are in the works but we're ultimately going to end up closing these joist cavities in as we're creating a finished space below.
Looks like a white aspergillus (distant relative of the normal black mould aspergillus niger).. but you won't know really unless you send for analysis.
Regardless though the treatment will probably be peroxide and acetic acid ... or one of the fairly scary mould treatments.
I did some testing .. ripped out the whole floor and joists and the hydrogen peroxide and acetic acid did as well as the stuff you need a full suit and breathing apparatus to spray...
I did however put an extractor under the floor and cleared all the airflow vents but partly as I also added an extra layer of concrete on top of the 1920's and subsequent mess underneath but I ran it for a long time after just to get more air circulation.