Use of aluminium foil tape over what?

Use of aluminium foil tape over what?

• A. A butt joint
• B. A welded seam
• C. A taped seam
• D. A stapled shiplap joint

Answer: (D)

Foil tape is used to seal joints in ductwork, providing an airtight barrier and a durable finish that resists temperature and moisture. A stapled shiplap joint creates a seam along ductboard panels that isn’t welded, so it relies on a sealant or tape to prevent air leakage across that edge. Applying aluminum foil tape over this seam wraps the joint in a continuous, airtight layer that sticks well to metal and ductboard, plus it tolerates the temperature swings and humidity typical in HVAC installations. Other joint types are normally addressed with different methods: welded seams are already sealed by the weld, and butt joints or taped seams are handled with appropriate sealants or tapes designed for those configurations, rather than relying on this particular stapled shiplap setup.

Foil tape is used to seal joints in ductwork, providing an airtight barrier and a durable finish that resists temperature and moisture. A stapled shiplap joint creates a seam along ductboard panels that isn’t welded, so it relies on a sealant or tape to prevent air leakage across that edge. Applying aluminum foil tape over this seam wraps the joint in a continuous, airtight layer that sticks well to metal and ductboard, plus it tolerates the temperature swings and humidity typical in HVAC installations.

Other joint types are normally addressed with different methods: welded seams are already sealed by the weld, and butt joints or taped seams are handled with appropriate sealants or tapes designed for those configurations, rather than relying on this particular stapled shiplap setup.