Shower Drain Frozen Repack

"I called 'Rapid Rooter' for a frozen shower drain. They charged $450 for a 15-minute visit. The tech just poured hot water mixed with calcium chloride (ice melt) down the vent stack on the roof. It worked, but I could have done that myself. He warned that if the ice had cracked the cast iron trap, it would be $3k. Thankfully it didn't. "

In some cases, you may see actual frost on exposed drain pipes in crawl spaces or basements. Why Shower Drains Freeze shower drain frozen

"When my basement shower drain froze, I didn't have a heat cable. Here’s what worked: "I called 'Rapid Rooter' for a frozen shower drain