Can You Coat Fiberglass?

Key takeaways

Duct coatings should only be applied after thorough cleaning to ensure effectiveness and safety.
Coatings can significantly improve indoor air quality and reduce friction in duct systems.
Applying coatings during HVAC changeouts can enhance system performance and longevity.
Training and certification from organizations like NADCA are essential for maintaining industry standards and ensuring safe practices.
Coating ducts is a cost-effective solution compared to full duct replacement.

Summary

Introduction to Duct Coatings

In this episode, Bryan interviews Zach, a duct cleaning expert, focusing on the benefits and applications of duct coatings, specifically the Hardcast RE500 product. The conversation covers important points such as the need for proper surface preparation before coating application, and the benefits of applying coatings on cleaned ducts. Zach highlights that coatings improve indoor air quality and are essential in preventing fiber shedding during cleaning processes.

Benefits of Duct Coating

Zach discusses how coating creates a smooth, cleanable surface that's comparable to sheet metal in terms of surface friction. This is crucial in high-velocity areas near HVAC equipment where fiber shedding is common. Coatings not only reduce friction but also protect the duct surfaces, enhancing airflow efficiency. The discussion emphasizes that coatings should be applied only after thorough cleaning to ensure proper adhesion.

Practical Applications and Cost-Effectiveness

A significant portion of the dialogue focuses on how duct coatings can be utilized during equipment changeouts. Bryan suggests the concept of coating the first 5-10 feet of ductwork near HVAC equipment, which tends to experience the highest airflow and is most susceptible to wear. Cost comparison is also addressed, revealing that coating ducts is considerably cheaper—about one-fourth to one-fifth the cost—compared to outright replacement.

Training and Certification

The importance of professional training and certification is highlighted, particularly from credible organizations like NADCA. Zach notes that proper training in duct cleaning and coating application is critical to avoid health risks associated with fiberglass fibers. He stresses that this knowledge boosts operational standards and improves overall air quality in residential and commercial spaces.

Health and Safety Considerations

The episode also touches upon the health and safety aspects of working with fiberglass duct systems. It discusses how proper coatings can enhance air quality by containing fibers and preventing their release into the air. Zach underlines the ethical considerations HVAC professionals must take into account while providing duct cleaning and coating services.

Show notes

In this episode of the HVAC School Podcast, Bryan interviews Zach about duct coatings and their applications in HVAC systems, particularly focusing on the Hardcast RE500 product. The discussion delves into the importance of proper duct coating applications and their benefits for both contractors and customers. Zach, who has extensive experience in duct cleaning and restoration, shares his expertise on the proper application and benefits of duct coating systems.

The conversation explores how modern ductboard comes with a clear coat that offers some protection, but additional coating can provide significant benefits, especially in high-velocity areas near equipment. They discuss how coating creates a smoother, more cleanable surface that's almost comparable to sheet metal in terms of friction resistance. Zach emphasizes that coating should only be applied after proper cleaning, as it's not meant to cover up dirty ducts but rather to protect and improve cleaned surfaces.

A significant portion of the discussion centers around the practical applications for HVAC contractors, particularly during equipment changeouts. Bryan proposes the idea of coating the first 5-10 feet of ductwork near equipment during changeouts, as these areas experience the highest velocity and are most susceptible to fiber shedding and moisture issues. The conversation also addresses the cost-effectiveness of coating versus replacement, with the coating being approximately one-fourth to one-fifth the cost of replacement.

Key Topics Covered:

Hardcast RE500 duct coating product and its applications
Benefits of duct coating, including reduced friction, fiber containment, and improved cleanability
The importance of proper surface preparation before coating application
Comparison between coated ductboard and sheet metal surfaces
Drying and curing times for duct coatings
The relationship between duct cleaning and coating services
Cost comparison between coating and replacement
Special considerations for coastal environments
NADCA certification and training requirements
The importance of proper application techniques and professional certification
Health and safety considerations regarding fiberglass ductwork
The role of duct coating in preventative maintenance
Application methods, including airless sprayer and brush/bucket techniques
Quality control and industry standards for duct coating

Learn more about NADCA at https://nadca.com/.

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