IICRC S520 Mold Remediation Flashcards

Under IICRC S520, which professional is qualified to perform post-remediation verification sampling and interpret results?

Answer: An independent Industrial Hygienist or qualified environmental professional

An independent IH or qualified environmental professional should conduct PRV to avoid conflicts of interest.

According to IICRC S520, what moisture level (by weight) in wood is generally considered the upper limit to prevent mold growth?

Answer: 19%

Wood moisture content should be kept below approximately 19% by weight to prevent mold growth.

Which of the following sampling methods collects mold spores impacted onto a sticky surface for microscopic analysis?

Answer: Tape lift sampling

Tape lift sampling collects surface spores on a transparent adhesive for direct microscopy.

IICRC S520 recommends that workers performing mold remediation wear protective clothing primarily to:

Answer: Prevent carrying mold spores out of the work area

Protective clothing, including disposable suits, prevents workers from carrying spores on their clothes into clean areas.

In IICRC S520 terminology, 'amplification' refers to:

Answer: The growth of mold beyond its normal ecological role due to a moisture source

Amplification is the abnormal proliferation of mold resulting from an uncontrolled moisture source in a building.

Which substrate is considered semi-porous and may be cleaned and retained if mold contamination is limited under IICRC S520?

Answer: Concrete block or brick

Concrete and masonry are semi-porous and can often be HEPA-vacuumed and wire-brushed then cleaned if contamination is not extensive.

IICRC S520 establishes that the root cause of mold growth must be corrected before or during remediation because:

Answer: Without moisture control, mold will recur even after successful remediation

Without eliminating the moisture source, mold will return regardless of how thoroughly the existing growth is removed.