Cold Water Line Heats up in Hot Attic
I have a very long house - 90' from one end to the other. The water main and water heater ared at one end, and the master bath at the other. During a recent remodel we changed our water lines from inside the slab to run through the Attic (in Southern California - no chance of freezing - condensation not an issue). We have a recirculating hot water system with a foam-wrapped copper loop so it doesn't take forever to get hot water to the kitchen baths. That works great.
The problem is the Cold Water! Even though the attic is well ventilated (2 fans, lots of vents) it can get very very hot - well over 100 degrees - on warm days. The un-insultated copper cold line heats up the water very quickly so when you turn on the COLD water, we get HOT water for two minutes until the hot water is flushed out and cold water from the underground main works its way to the faucet.
Is there any way to keep the cold water pipe from heating so much? Would wrapping it with insulation help? Or make it worse?
The recirculating system saves water so you dont have to run it waiting for hot water. Never thought I would waste water running the cold tap to wait for cool water.