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 Seismic restraints recommended when rigid gas lines are connected to water, hints from a home inspectorSeismic restraints recommended when rigid gas lines are connected to water heater: seismic restraints are like insurance; it is better to have them and not need them than to need them and not have them. In the event of an earthquake, or other violent movement, seismic restraints should maintain the water heater in an upright position. If it were to fall, a fire could result from a broken gas line. Physical injury or other heavy damages could occur, especially if the water heater is installed in the attic. Have a plumbing contractor or someone from a home repair service install "earthquake straps" securely around the water heater. Although manufactured braces are available, a metal diagonal framing brace will work fine. One should be at the top and one at the bottom of the water heater. Braces are available at building supply dealers. The health and safety codes vary from state to state. The state of California, for example, requires the seller of the property to install seismic restraints before close of escrow. The straps should be in the top third and lower third of the water heater, but at least 4 inches above the control valves. The straps should not be wrapped around a water heater blanket. Straps should be fastened to wall studs with lag bolts. Use large washers with the lag bolts to prevent the lag bolt head from pulling through the strap. It is acceptable to use heavy plumbers tape, with the exception that certain municipalities do not allow plumbers tape on newly installed water heaters. Metal brackets attached to the top of the water heater will not conform to the new requirements of the state of California. Other states may or may not have similar requirements. Be aware that movement of the water heater due to and during the installation of seismic restraints may cause gas and/or water pipes immediately connected to the unit to leak. You are advised to review the water heater and all connecting pipes closely during your final walkthrough. Rigid gas lines are not allowed in areas of the country where seismic action may be expected. Install a flex gas connector line directly to the water heater. This may require the services of a plumbing contractor. Copper gas lines are not commonly used PVC plastic gas lines: plastic gas line is very common Flexible gas lines: flex gas lines commonly are used as connector lines Galvanized gas pipes or fittings Copper brass drain lines Cast iron drain lines Galvanized drain lines ABS plastic drain pipes are quite common Orangeburg or fiber drain pipe: Orangeburg Clay sewer lines Municipal water supply Private water well
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