What should be done to the self-sealing lap of fiberglass pipe insulation when the ambient temperature is below 50°?

To ensure optimal performance and efficiency of fiberglass pipe insulation in cooler ambient temperatures, reinforcing the self-sealing lap with flared staples is a crucial step. When the temperature drops below 50°, the adhesive properties of the self-sealing lap may be compromised, leading to a less effective seal and potential air leaks. By using flared staples, you provide additional mechanical support to secure the insulation in place, maintaining the integrity of the installation and maximizing its insulating properties. This reinforcement helps prevent any gaps that could allow heat loss, thereby improving energy efficiency and protecting the pipes from condensation and potential freezing.

Other options, while they may seem practical in certain scenarios, do not address the core issue of ensuring a secure seal under low-temperature conditions. Leaving it as is could lead to inadequate insulation performance. Applying a secondary sealant might not bond effectively in cold temperatures, and insulating with thermal tape doesn't provide the necessary structural support that flared staples do. Therefore, reinforcing with flared staples is the most effective method under such conditions.