Sealing Floor Ducts

How to seal duct boot to ceiling with fiberglass mesh tape and mastic for gaps larger than 3 8 inch.

Sealing floor ducts.

An odor alerted me to standing water debris and even a dead animal in the ducts below my floor. Use caulk for gaps that are less than 3 8 inch. Watch this video for more tips to seal air ducts. The tape does a great job sealing but as the metal expands and contracts with seasons it can begin to come loose.

Heat must travel a shorter distance and enters. Seal the seam between the duct boot and the flooring or sealing framing and finish material. I just discovered that the air ducts in my concrete slab have problems. This is one of those things that can go unnoticed but have.

Use fiberglass mesh tape and mastic where gaps are larger than 3 8 inch. Today s technology enables you to seal your entire air duct system from the inside. That is where the duct sealer comes in. If you really want to seal all of your air ducts you will need to contact a professional.

Make sure the sealer extends below the bottom of the tape but do not put any on your floor. Floor vents are typically used in homes where the furnace is in a basement or the ducts the piping from the furnace travel through an underground crawlspace. I have galvanized air. Only qualified contractors should perform changes to your duct system.

Floor ducts are effective because they deliver heated air at floor level. Use your putty knife to generously coat the aluminum tape with duct sealer.