How to Solder Galvanized Flashing

Galvanized flashing is a common element in roofing. Connecting these pieces together properly contributes to sealing out moisture and making the roof look visually integrated. The most common method of joining galvanized flashing is through soldering. However, instead of using a small soldering iron, it's necessary to bring out a larger, more effective heat source.

Clean cloth
Solder flux
Propane torch
Spark generator
Lead-free solder

Instructions

- 1
  Wipe the sections to be soldered with the clean cloth. Apply a liberal coating of solder flux to both sides of the flashing.
- 2
  Place the two sections as close together as possible, in their final installed location. Turn the knob on the propane torch to begin the gas flow. Hold the spark generator one inch from the tip of the valve. Squeeze the handles of the spark generator in rapid succession to ignite the gas. Adjust the knob on the propane torch to create four to six inches of flame.
- 3
  Heat the flashing at the seam until the flux begins to bubble. Immediately place the soldering bar against the heating seam. The solder will flow using capillary action along the fluxed seam.

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