Before applying any heat, open the faucet connected to the frozen drain pipe. As the ice begins to melt, water needs a path to escape. Leaving the faucet open allows water to flow out rather than building up pressure inside the pipe, which is the primary cause of pipe bursts.
Modern homes often use plastic piping (PVC/ABS) and modern insulation materials. Older thawing methods can be dangerous. how to unfreeze a drain pipe 2021
The salt lowers the freezing point of the water, making it a very effective ingredient for melting ice. For frozen pipes exposed in a basement or crawlspace: Before applying any heat, open the faucet connected
Before attempting to thaw the line, prepare your workspace to minimize water damage. Modern homes often use plastic piping (PVC/ABS) and
Before you can apply heat, you need to pinpoint exactly where the ice blockage is located. Begin at the affected faucet or drain and work backward along the pipe, tracing it as far as you can. Look for frost on the outside of the pipe, which indicates the frozen section. Another useful technique is to tap the pipe lightly with a metal object and listen: a hollow sound suggests flowing water or air, while a solid, dull thud usually indicates ice inside the pipe. Pay special attention to the P-trap — the curved section of pipe underneath sinks, showers, and tubs — as this is where freezing most commonly occurs.
Some situations are not DIY-friendly. Call a professional if:
The following techniques are widely recommended for safely restoring drainage: