Other guidelines to be observed when sealing ductboard include: which of the following is a correct guideline?

Other guidelines to be observed when sealing ductboard include: which of the following is a correct guideline?

• A. Preheat the tape if either the aluminum foil tape or surface is below 50°F at the time of application
• B. Tape width must be at least 4 inches for all tapes
• C. Heat-activated tape does not require heating after application
• D. Tape width for pressure-sensitive tape must be at least 1 inch

Answer: (A)

Adhesive performance on ductboard is highly temperature dependent. When either the tape or the surface is cold, the adhesive can become stiff and won’t flow well enough to make a strong bond, which risks leaks. Preheating the tape if the tape or the surface is below about 50°F helps the adhesive soften and wet out the surface properly, so the tape adheres firmly and forms a durable seal. Other guidelines aren’t universal. Tape width can vary by product and application, so a blanket rule that all tapes must be at least 4 inches isn’t always correct. Heat-activated tape does require heat to activate the adhesive, so the claim that it does not require heating after application is incorrect. And the minimum width for pressure-sensitive tape isn’t fixed at 1 inch in all cases; installers choose widths based on the seam and tape type. The temperature-focused guideline directly addresses achieving a reliable bond under common field conditions.

Adhesive performance on ductboard is highly temperature dependent. When either the tape or the surface is cold, the adhesive can become stiff and won’t flow well enough to make a strong bond, which risks leaks. Preheating the tape if the tape or the surface is below about 50°F helps the adhesive soften and wet out the surface properly, so the tape adheres firmly and forms a durable seal.

Other guidelines aren’t universal. Tape width can vary by product and application, so a blanket rule that all tapes must be at least 4 inches isn’t always correct. Heat-activated tape does require heat to activate the adhesive, so the claim that it does not require heating after application is incorrect. And the minimum width for pressure-sensitive tape isn’t fixed at 1 inch in all cases; installers choose widths based on the seam and tape type. The temperature-focused guideline directly addresses achieving a reliable bond under common field conditions.