Which statement about flashing tape is accurate?

• A. To color-code the roof for aesthetics.
• B. To act as a temporary water barrier during installation.
• C. To seal joints and seams before applying metal flashing and to improve waterproofing.
• D. To function as the main waterproofing layer without flashing.

Answer: (C)

Flashing tape is used to seal joints and seams before installing metal flashing, which helps improve the waterproofing of the flashing assembly. In a roof system, you want a continuous, watertight path where metal flashing meets other surfaces, and the tape fills small gaps and irregularities that could let water seep behind the flashing. It’s an aid to the flashing system, not the primary waterproofing layer itself. The main defense against water is the combination of the underlayment or membrane and the properly installed flashing, with the tape reinforcing the seal at joints and transitions. It isn’t for aesthetics, it isn’t a temporary barrier, and it shouldn’t be treated as the sole waterproofing layer.