If you can safely access the roof vent pipe, pour a bucket of (1 cup salt per gallon) down the vent. Salt lowers the freezing point of water. Do this only if you’re comfortable on a roof – ice is a serious hazard.
Inspect the entire exposed length of the frozen pipe for any signs of cracking, bulging, leaking, or other visible damage. If you find any damage whatsoever, . Call a licensed plumber immediately. Thawing a damaged pipe can turn a small crack into a complete rupture, releasing potentially contaminated water into your home.
During extreme cold snaps, keep vanity and kitchen cabinet doors open to let warm house air circulate around the plumbing.
A: According to NOAA’s winter 2020–2021 outlook, the northern US and Canada saw longer, deeper cold spells. If your pipe froze last year, it will freeze again unless you insulate.
Before attempting to thaw, you must pinpoint where the blockage is. Look for:
: Do not use blowtorches or lighters. This is a severe fire hazard and can damage plastic (PVC) pipes or melt soldered joints.
Salt lowers the freezing point of water, making it an excellent natural de-icer for clogged drains.
Use a hair dryer on a medium or low setting. Move it back and forth along the frozen section. Do not hold it in one spot for too long, especially on PVC pipes, which can warp or melt at temperatures as low as 140°F (60°C).