How to Weld Around Polyiso Insulation

Polyiso insulation, or polyisocyanurate insulation, is a plastic form of foam insulation installed by spray or through rigid foam boards. When welding, it is necessary to move this insulation out of the way to prevent it from melting from the high heat of the welding torch and melted metal. Once the insulation is cleared out of the way, the welding procedure can occur as normal, with all proper safety precautions in observation.

Drywall saw
Hammer
Respirator mask
Welding visor
Welding apron
Welding gloves
Welding torch
Welding metal
Fire extinguisher
Duct tape

Instructions

- 1
  Cut away the section of insulation surrounding the metal with a drywall saw. You can also remove the nails holding the insulation in place with the back of a hammer and set the entire section aside. If the insulation is foam, cut through the insulation with the saw and set it aside while you work. Clear a 24-inch section of insulation around the metal you want to weld.
- 2
  Put on safety gear including a respirator mask, welding visor, welding apron and gloves. Make sure the area where you weld is well-ventilated.
- 3
  Weld the two pieces of metal together holding the torch at least 24 inches away from your face. Try not to get any sparks onto the surrounding insulation. Keep a fire extinguisher on hand to dissipate any sparks that get onto the insulation. Allow the metal to cool for two hours.
- 4
  Replace the insulation back over the metal, either with nails if the foam is in board form, or by taping the insulation in place with duct tape.

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