On average, air ducts filter about 20 to 30% of air conditioning (Energy Star). To reduce air loss and increase energy efficiency, it is recommended to seal all joints and add insulation around ducts, especially in spaces without air conditioning. Whether you decide to use adhesive tape or putty to seal the ducts, the main goal is to achieve a durable and reliable seal. It can be difficult to reach all areas of the ducts, and you'll need to be especially careful when filling in important gaps, as you don't want putty to enter the ducts.
The construction industry has established regulatory requirements for duct sealing and repair. For example, if a pipe's ducts have insulation around them, you'll first need to unwrap them, seal the leaks, and finally, replace the insulation. Putty is a perfect option for sealing the duct system, but it must be applied carefully and can make a mess. In general, duct sealing requires that sections of the duct network fit tightly into joints and connections.
Ducts of this type must pass industry-approved leak tests and must be sealed in accordance with industry best practices. The code standards establish three different levels of duct sealing, depending on the type and location of the duct network. Sealing the ducts ensures that all sections of the duct network fit perfectly together and that there are no openings, holes or loose sections that could allow hot or cold air to escape. An HVAC contractor will normally use a combination of putty and duct tape to achieve the perfect seal.
Before starting any work on your air ducts, it is important to consult these standards and consult your trusted local HVAC contractor for detailed information on duct sealing requirements. Duct mastic is a type of adhesive used for sealing air ducts. It is a thick paste-like material that is applied directly onto the surface of the ductwork. It is designed to provide an airtight seal that will last for years.
It is also resistant to temperature changes and can withstand extreme temperatures. When using mastic for sealing air ducts, it is important to follow all safety precautions. Mastic should only be applied in well-ventilated areas and should never be used near open flames or other sources of heat. Additionally, it should not be applied directly onto insulation or other combustible materials.
Mastic is also available in different types depending on its intended use. For example, there are mastic products specifically designed for use in high-temperature applications such as furnaces or boilers. There are also mastic products designed for use in low-temperature applications such as refrigeration systems. When applying mastic for sealing air ducts, it is important to ensure that all surfaces are clean and dry before application.
Additionally, it is important to apply an even layer of mastic over the entire surface area of the ductwork. This will ensure that there are no gaps or openings where air can escape. Mastic can also be used in conjunction with other materials such as adhesive tape or putty for additional protection against air leakage. However, it is important to note that mastic should not be used as a substitute for proper installation techniques such as using screws or rivets.
In conclusion, mastic can be an effective solution for sealing air ducts when used correctly. It provides an airtight seal that will last for years and can withstand extreme temperatures. However, it is important to follow all safety precautions when using mastic and consult your local HVAC contractor for detailed information on duct sealing requirements.