The heel of an insulated 45-degree elbow is sweating and dripping
Condensation usually means humid air is reaching cold metal through an air gap or broken vapor barrier. Dry it, tighten the wrap, and seal the vapor barrier continuously.
Do not tape over wet insulation or leave air pockets against cold supply duct.
Check
Find the exact sweating point on the elbow heel.
Look for loose wrap, air pockets, torn foil, or wet insulation.
Dry the metal skin before resealing.
Maintain continuous vapor barrier around the curve.
Check nearby uninsulated collars, taps, and seams too.
Steps
Find the exact sweating point on the elbow heel.
Look for loose wrap, air pockets, torn foil, or wet insulation.
Dry the metal skin before resealing.
Maintain continuous vapor barrier around the curve.
Check nearby uninsulated collars, taps, and seams too.
Say this to your foreman
The 45 elbow heel at [location] is sweating because the insulation/vapor barrier has a gap. I dried the area and found the break. Do you want the wrap replaced and resealed now?