As an HVAC expert, I have been asked numerous questions about the use of duct seal putty outside. Many homeowners are concerned about its durability and effectiveness in different climates. In this article, I will share my knowledge and experience to provide you with a comprehensive understanding of this topic. First and foremost, let's address the question of durability. Duct seal putty is designed to last for several years, making it a reliable choice for sealing ducts.
However, there are certain factors that can affect its performance, particularly in extremely dry and hot climates. One potential issue with using duct seal putty outside is its susceptibility to extreme temperatures. In extremely hot climates, the putty may become brittle and crack over time, compromising its ability to seal the ducts effectively. Similarly, in extremely cold climates, the putty may become too hard and lose its flexibility, making it difficult to apply and potentially leading to cracks or gaps in the seal. Another concern is the ability of duct seal putty to block water vapor. While it is effective in most cases, there have been reports that over time, it may not be as effective as other sealing methods.
This is especially true when cables pass through the putty, creating potential weak points in the seal. So what are the alternatives? One option is to use expandable closed cell foam to seal the outside of the ducts. This type of foam is specifically designed for outdoor use and can withstand extreme temperatures without compromising its effectiveness. Another option is to use silicone sealant, which is also suitable for outdoor use and has excellent water vapor blocking properties. However, if you do choose to use duct seal putty outside, there are some precautions you can take to ensure its longevity and effectiveness. First, make sure to apply the putty according to the manufacturer's instructions, paying special attention to the recommended temperature range for application.
Additionally, regularly inspect the seal for any signs of cracking or deterioration and reapply the putty as needed. It's also important to note that duct seal putty is not a permanent solution. Over time, it may need to be reapplied or replaced, especially in harsh climates. Therefore, it's essential to monitor its performance and address any issues promptly to prevent potential damage to your HVAC system. In conclusion, while duct seal putty can be used outside, it may not be the most durable or effective option in all climates. Consider using alternative sealing methods such as expandable closed cell foam or silicone sealant for better results.
And if you do choose to use duct seal putty, make sure to follow proper application techniques and regularly inspect and maintain the seal for optimal performance.