When it comes to sealing metal and flexible ducts, adhesive tape is not always the best option. A better alternative is duct putty, a soft material that does not harden, similar to caulking. Putty remains flexible as the metal expands and contracts, making it a great choice for sealing ducts. However, a combination of putty and adhesive tape is often used to achieve the perfect seal.
Putty tape is another excellent option, which looks like regular aluminum tape but has a putty-resistant adhesive. High-quality adhesive tape can also be used, but it should only be used as a temporary solution. Duct tape is a faster and relatively simple solution to air duct leak problems, but it can be difficult to reach all areas of the ducts. Special care must be taken when filling important gaps, since putty is not recommended to enter the ducts. When attaching the duct to the trunk, the seam should be properly sealed before repairing the roof. This will help prevent distant rooms from receiving less air flow than expected by the duct designer.
Hardcast recommends using Foil-Grip butyl tape with ducts, duct plates, or flexible galvanized steel ducts. Unfortunately, few building inspectors outside of California bother to enforce current code requirements that residential duct joints be sealed with high-quality putty or adhesive tape. Cleaning the ducts and then installing putty and insulation in the ducts is a good plan for achieving an effective seal.
What are the Best Alternatives to Duct Sealant?
When it comes to sealing metal and flexible air ducts, there are several options available. The most popular alternatives are duct putty, putty tape, and adhesive tape. Each of these materials has its own advantages and disadvantages that should be taken into consideration when selecting the best option for your project.Duct Putty
Duct putty is a soft material that does not harden over time, making it an ideal choice for sealing metal and flexible air ducts.It remains flexible as the metal expands and contracts, allowing for a secure seal that won't crack or break over time. Additionally, it can be used in combination with adhesive tape for an even more secure seal.
Putty Tape
Putty tape looks like regular aluminum tape but has a putty-resistant adhesive. This makes it an excellent choice for sealing air ducts as it provides a strong bond that won't break down over time. It's also easy to apply and can be used in combination with other materials for an even more secure seal.Adhesive Tape
Adhesive tape can also be used for sealing air ducts, but it should only be used as a temporary solution.Duct tape is a faster and relatively simple solution to air duct leak problems, but it can be difficult to reach all areas of the ducts with this material. Special care must be taken when filling important gaps since putty is not recommended to enter the ducts.