CBD Plumbing & Fixture Integration 4

Question 1

What GPM (gallons per minute) flow rate is federally mandated for new showerheads in the United States as of current WaterSense standards?

Accepted Answer

2.5 GPM

Answer

The federal maximum for showerheads is 2.5 GPM at 80 psi, though WaterSense-labeled products are rated at 2.0 GPM or less.

Question 2

A designer is specifying a deck-mounted faucet for a freestanding tub. The most critical dimension to verify is the:

Accepted Answer

Hole spacing matching the faucet's center-to-center measurement

Answer

Deck-mounted faucets are pre-drilled with specific hole spacing (commonly 3.5" or 8" center-to-center), which must match the tub deck pre-drilled holes or cutouts.

Question 3

In a bathroom with a steam shower, the steam generator should be located:

Accepted Answer

Within 25 feet of the shower unit with access for service

Answer

Steam generators should be within 25 feet of the shower (per most manufacturer specs) and in an accessible location for maintenance, but not inside the wet enclosure.

Question 4

Which type of supply stop valve is preferred under a vanity for ease of fixture replacement?

Accepted Answer

Quarter-turn ball valve stop

Answer

Quarter-turn ball valve stops provide reliable shutoff, are easy to operate, and don't suffer from the washer degradation that plagues compression valves.

Question 5

The main advantage of a wall-mounted faucet on a lavatory versus a deck-mounted faucet is:

Accepted Answer

Easier countertop cleaning and no deck penetrations

Answer

Wall-mounted faucets eliminate holes in the countertop and make the counter surface easier to clean since there are no deck penetrations or faucet bases.

(CBD) Certified Bathroom Designer Practice Test

(CBD) Certified Bathroom Designer Practice Test

CBD Plumbing & Fixture Integration 4