CSLB C-36 Plumbing ContractorFixture and Appliance InstallationEasy
A plumber is installing a water heater in a commercial building. The local code requires that the water heater be protected from seismic activity. Which of the following methods is most effective for securing a large commercial water heater against seismic forces?
- AResting it on a rubber mat to absorb vibrations.
- BUsing plastic zip ties to attach it to nearby piping.
- CPlacing it on a concrete pad with no additional restraints.
- DSecuring it with two galvanized metal straps, one in the upper third and one in the lower third, anchored to the structural framing.
Show answer & explanationAnswer & explanation
Correct answer: D. Securing it with two galvanized metal straps, one in the upper third and one in the lower third, anchored to the structural framing.
Proper seismic strapping involves securing the water heater to the building's structural framing at specific points to prevent tipping or movement during an earthquake. Galvanized metal straps are robust and suitable for this purpose.
Why the other options are wrong
- A. Rubber mats might absorb minor vibrations but offer no resistance to tipping or significant lateral movement during an earthquake.
- B. Plastic zip ties are not strong enough to withstand seismic forces and would easily break, offering no protection.
- C. A concrete pad alone does not secure the water heater; it can still slide or tip over.
Water Heater Seismic Strapping
The process of securing a water heater to a building's structural elements using approved straps to prevent damage or injury during an earthquake.
- Required in seismically active areas.
- Typically involves two straps: one in the upper third and one in the lower third.
- Straps must be anchored to structural framing.
Memory trick: Secure the tank, save the day, when the earth starts to sway.