Sealing Floor Ducts

Seal the seam between the duct boot and the flooring or sealing framing and finish material.

Sealing floor ducts.

How to seal duct boot to ceiling with fiberglass mesh tape and mastic for gaps larger than 3 8 inch. Heat must travel a shorter distance and enters. I just discovered that the air ducts in my concrete slab have problems. Use fiberglass mesh tape and mastic where gaps are larger than 3 8 inch.

Watch this video for more tips to seal air ducts. An odor alerted me to standing water debris and even a dead animal in the ducts below my floor. Use your putty knife to generously coat the aluminum tape with duct sealer. If you really want to seal all of your air ducts you will need to contact a professional.

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. Diy duct sealing only goes so far. The heat then rises and continues to warm the rest of the room. This is one of those things that can go unnoticed but have.

The tape does a great job sealing but as the metal expands and contracts with seasons it can begin to come loose. If you live in a house with a crawl space there is a good chance the floor vents are not sealed. That is where the duct sealer comes in. Use caulk for gaps that are less than 3 8 inch.

Floor ducts are effective because they deliver heated air at floor level. I have galvanized air.