Filling Floor Vents With Concrete

Hvac air ducts located inside concrete slab floors invite a surprisingly broad range of building problems that fall into two broad categories.

Filling floor vents with concrete.

Someone said i should seal the floor vents and install new vents in the ceiling but that sounds very expensive and i would prefer to keep my floor vents. The forced air vents in our floor fill with water whenever it rains. This has caused the metal ducts to rust out and expose the dirt. This article describes heating and air conditioning ducts that have been placed in or beneath concrete floor slabs.

The hard part is replacing the flooring itself. Foam may do the same thing. Local companies refuse to work on them. If you have floor registers in your basement that mean that the duct work is either in the slab which would be difficult to do with a typical concrete slab being 4 inches thick or it is running in the gravel below the concrete and just coming up through the concrete.

I would think you need to insert some expansion material to prevent cracking the floor slab. Filling the holes is the easy part. Now i have these vents in my floor we are on a slab no basement or crawl space and i need to do something with them. When mixed with water it produces putty like mortar with good wash out resistance and a powerful bond onto wet concrete substrates.

We recently had our hvac system replaced from floor vents to ceiling vents. Then just fit a piece of sub floor in the opening and screw it onto the 2x4 s. Concrete would add some strength to the slab. I have no idea who i should call or what kind of business does this type of repair work.

Old metal pipes rust out that they used for slab ducts. Hvac ductwork in floor slabs. If the ducts are way below the slab it may not be necessary and you could fill w sand top off with concrete. This water is filling the lowest spot under the furnace where all the basement s heat vents connect.

Functional troubles such as lack of air flow or collapsed ductwork and environmental problems such as. They are metal vents buried and encased in the concrete floor. Vents buried below a basement floor are new to me. Concrete floor patch fill is a blend of ordinary and specialist cements high quality graded aggregates and a unique combination of polymers and admixtures.

I bet it wouldn t take all that much concrete to fill them anyway and it would be much easier to pump it than to mix it by hand. The hvac company was going to blow insulation into them and cap them off w a piece of metal. You put a scrap of 2x4 under the floor across the hole on each side and run screws through the existing subfloor to fix the scrap in place.