As per your request i visited the subject residence today to evaluate mold or fungus growth on the floor joists.
Yellow mold on floor joists.
Household mold typically grows in damp areas of the home such as bathrooms and basements.
It uncommon during cold weather this type of mold growth needs to be given just as much special attention as black molds because regardless of color the white fuzzy mold in crawl space is still mold which means to say it has the capacity to.
Removing the problem depends on the type of fungus responsible and the degree of infestation.
In crawl spaces where lighting is more dim take an extension cord and a drop light with you as you inspect the floor joists for mold.
It can also be found under leaky sinks around leaky window frames and in attics or on ceilings when roofs leak.
Grab a helper for this task if you can.
I understand that a home inspector expressed concern about fungal growth on the floor framing so the buyer is concerned that the fungus needs to be removed cleaned mitigated from the joists.
A variety of fungi can result in mold or mildew on floor joists.
Types of mold that are yellow.
Mold can be found in many colors including black white brown green and yellow.
In some cases altering the conditions around the wood can stop growth but in more severe situations a visit from a professional is required.
Yellow mold can grow on floor joists walls furniture other damp materials.