Commercial Building Mitigation Flashcards

In a large commercial building with multiple sub-slabs, what is the primary reason for installing multiple suction points?

Answer: To ensure adequate pressure field extension across all zones

Multiple suction points are required when a single point cannot extend the negative pressure field across the entire sub-slab area.

Which document is required before beginning radon mitigation work in a commercial building in most U.S. jurisdictions?

Answer: A building permit

Most jurisdictions require a building permit before structural modifications such as core drilling and pipe installation in commercial buildings.

A school building has radon levels of 6.2 pCi/L in occupied classrooms. According to EPA guidance, what action is recommended?

Answer: Mitigate the building as soon as possible

EPA recommends mitigation when school radon levels exceed 4 pCi/L in frequently occupied areas.

What type of fan is most appropriate for a large commercial Sub-Slab Depressurization (SSD) system requiring high airflow at moderate static pressure?

Answer: Centrifugal blower fan

Centrifugal blower fans are preferred for large commercial SSD systems because they deliver high airflow at the moderate static pressures typical in those applications.

When installing radon mitigation piping through a fire-rated wall in a commercial building, what is required?

Answer: Fire-rated sleeve or intumescent collar must be installed

Building codes require fire-rated sleeves or intumescent collars when penetrating fire-rated assemblies to maintain the fire separation rating.

In a commercial building, which foundation type presents the greatest challenge for achieving uniform sub-slab depressurization?

Answer: Slab with multiple isolated footings and interior walls

Multiple isolated footings and interior walls create compartments that restrict pressure field extension, requiring additional suction points.

A diagnostic pressure field extension test in a commercial building shows less than -1 Pa at 10 feet from the suction point. What does this indicate?

Answer: Sub-slab communication is poor and additional suction points are needed

A pressure differential of less than -1 Pa at 10 feet indicates inadequate sub-slab communication, requiring additional suction points for effective mitigation.