CBD Plumbing & Fixture Integration 5

Question 1

In a bathroom remodel, the designer discovers the existing drain is cast iron. When connecting new PVC drain to existing cast iron, the proper transition fitting is a:

Accepted Answer

Fernco flexible coupling (rubber band coupling)

Answer

A Fernco (or Mission) flexible rubber coupling with stainless steel clamps is the standard method to join dissimilar pipe materials like PVC to cast iron.

Question 2

A designer specifies a digital shower system with multiple output zones. The control processor for such a system is typically located:

Accepted Answer

In a remote mechanical module installed outside the wet area

Answer

Digital shower processors/modules contain electronics that must be kept dry, so they are installed in a nearby accessible space outside the shower enclosure.

Question 3

When a lavatory drain does not have an overflow, the designer must specify a drain that:

Accepted Answer

Is designed without an overflow port to avoid a cross-connection

Answer

If a sink bowl has no overflow, a drain without an overflow port must be used to avoid creating a dead-end cavity that can harbor bacteria (cross-connection concern).

Question 4

The hot water supply to a bathroom should be sized to deliver hot water within how many seconds per NAHB green building guidelines for master baths?

Accepted Answer

Under 30 seconds

Answer

NAHB green building guidelines recommend hot water delivery within 30 seconds at the point of use to reduce water waste from running the tap while waiting.

Question 5

Which toilet type is most appropriate for a bathroom where the designer wants to completely conceal all plumbing within the wall?

Accepted Answer

Wall-hung toilet with in-wall tank carrier

Answer

Wall-hung toilets with in-wall carrier systems conceal both the tank and all supply/drain connections within the wall cavity for a completely clean appearance.

(CBD) Certified Bathroom Designer Practice Test

(CBD) Certified Bathroom Designer Practice Test

CBD Plumbing & Fixture Integration 5