Sealing Floor Ducts

Use fiberglass mesh tape and mastic where gaps are larger than 3 8 inch.

Sealing floor ducts.

Diy duct sealing only goes so far. This is one of those things that can go unnoticed but have. Use caulk for gaps that are less than 3 8 inch. 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 just discovered that the air ducts in my concrete slab have problems. Floor ducts are effective because they deliver heated air at floor level. 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.

Watch this video for more tips to seal air ducts. Only qualified contractors should perform changes to your duct system. Seal the seam between the duct boot and the flooring or sealing framing and finish material. Today s technology enables you to seal your entire air duct system from the inside.

The heat then rises and continues to warm the rest of the room. Make sure the sealer extends below the bottom of the tape but do not put any on your floor. The tape does a great job sealing but as the metal expands and contracts with seasons it can begin to come loose. If you really want to seal all of your air ducts you will need to contact a professional.

How to seal duct boot to ceiling with fiberglass mesh tape and mastic for gaps larger than 3 8 inch. If you live in a house with a crawl space there is a good chance the floor vents are not sealed.