2 part question.
After seeing ghosting in the closet adjacent the bathroom I performed humility evaluation on the gypsum.
Closet averaged 8% to 10% respectively.
Basement and under 500 sq-ft.
Lowest is 30" inches below grade to 0% at the back of the unit.
I did random sampling to form a hypothesis on(organic growth).
Higher levels of humidity in the wall board in a closet adjacent ( connecting too ) and the bathroom.
I covered the lowest and mid sections of the walls inside the closet, bedroom, bathroom.
I separated the unit into 2 parts, front and back half for my hypothesis. .
Back half = bathroom, bedroom.
Front= hall, kitchenette and living room entrance.
Front averaged 5.xxx% relative humidity, the back half averaged 9.xxxx.
#1: Basement apartment.
#2: Wall samples averaged 9%+( bathroom and closet )
#3: 5% in the rest of the unit.
#4: The unit had been vacant for over 1 month.
#5: no visible signs of growth in the living araea.
#6: Signs of living plant and organic growth in-between window openings of the bedroom.
Unit in 5 years old. Windows are hinged mechanical, thermo pain, with exterior screen.
Screened area never cleaned.
What are acceptable levels?
Would a IR camera have been able to complete my hypothesis when investigating form mold?
PS: I studied the IAC2 course " and think " I remember that relative humidity levels under 17% percent are not conductive to mold growth.
I am going back to complete this cert.