What is the proper overlap for duct wrap (blanket insulation) on commercial jobs?

Duct wrap insulation should have a minimum of a 2-inch facing lap at all longitudinal and transverse seams to guarantee a continuous vapor barrier seal.

['Duct wrap insulation should have a minimum of a 2-inch facing lap at all longitudinal and transverse seams to guarantee a continuous vapor barrier seal.']

Stop if

• Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

Steps

• Duct wrap insulation should have a minimum of a 2-inch facing lap at all longitudinal and transverse seams to guarantee a continuous vapor barrier seal.

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