How To Prevent Pipes From Freezing in the Lehigh Valley

Why the Lehigh Valley Has a Pipe Freeze Problem

The Lehigh Valley doesn't experience the sustained deep cold of northern Pennsylvania or upstate New York — but it experiences something more damaging to residential plumbing: aggressive freeze-thaw cycling. Temperatures that drop to 15°F overnight and climb to 38°F the following afternoon, repeating dozens of times between November and March, create pressure differentials inside pipes that sustained cold never produces. Each freeze cycle stresses the pipe. Each thaw releases that stress — sometimes through a split.

The region's older housing stock is the other half of the equation. Allentown, Bethlehem, and Easton have some of Pennsylvania's highest concentrations of pre-1940 residential construction — homes built when insulation requirements were minimal and pipe placement in exterior walls was standard practice. These homes have pipes in locations that modern construction would never allow, exposed to conditions that cause failures in cold weather that newer construction simply doesn't experience.

Highest-Risk Locations in Lehigh Valley Homes

• Pipes in exterior walls — particularly north and west-facing walls in older Allentown and Bethlehem housing. Kitchen and bathroom supply lines in exterior walls are the primary source of burst pipe calls.
• Basement pipes near foundation walls — especially in older homes where insulation between the pipe and cold foundation is minimal or absent.
• Crawlspace plumbing — homes with crawlspaces rather than full basements, common in older Easton construction, often have uninsulated pipe in these spaces.
• Attached garage plumbing — utility sink lines and supply pipes running through garage walls are unheated.
• Outdoor hose bibs — must be disconnected and drained every fall without exception.

Prevention Steps — In Priority Order

1. Insulate Pipes in Vulnerable Locations

Foam pipe insulation sleeves are inexpensive, available at any hardware store, and take minutes to install on accessible pipes. For basement pipes near foundation walls and any exposed crawlspace piping, this is the highest-priority preventive measure. Insulation doesn't heat the pipe — it slows heat loss, buying time before pipe temperature drops to freezing.

2. Disconnect and Drain Outdoor Hose Bibs

Every fall before the first hard freeze, disconnect all garden hoses. Modern frost-free hose bibs drain automatically when the hose is disconnected — but only if no hose is attached. Disconnect all hoses before November. Older non-frost-free bibs require shutting off the interior valve and opening the exterior spigot to drain the line.

3. Open Cabinet Doors Under Exterior Wall Sinks

During cold snaps, open the cabinet doors under kitchen and bathroom sinks on exterior walls to allow warm interior air to circulate around supply lines. This is a free, immediate measure that makes a real difference in older Lehigh Valley homes where these pipes are in exterior walls with minimal insulation.

4. Maintain Minimum Heat When Away

The minimum thermostat setting when leaving an older Lehigh Valley home unoccupied in winter is 60°F — not 55°F. For homes with known insulation deficiencies in exterior walls, 65°F is safer. The heating cost difference is negligible compared to a single burst pipe event.

5. Know Your Main Shutoff

The second line of defense is stopping damage quickly when prevention fails. Know exactly where your main water shutoff is and confirm it operates freely. Test it annually. A seized valve during a pipe burst is a catastrophe.

When Prevention Fails

Despite every precaution, the Lehigh Valley's freeze-thaw cycling produces burst pipe events every winter. When a pipe fails, the response in the first thirty minutes determines the scope of damage. Shut off the main, cut power to affected areas, document everything, and call immediately. The 48-hour mold window means there is no time to wait and see.