Filling Floor Vents With Concrete

When you pour concrete into slab duct you will have expansion from new cement.

Filling floor vents with concrete.

I would think you need to insert some expansion material to prevent cracking the floor slab. Filling the holes is the easy part. This article describes heating and air conditioning ducts that have been placed in or beneath concrete floor slabs. This water is filling the lowest spot under the furnace where all the basement s heat vents connect.

Concrete floor patch fill is a blend of ordinary and specialist cements high quality graded aggregates and a unique combination of polymers and admixtures. Local companies refuse to work on them. 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.

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. They are metal vents buried and encased in the concrete floor. If the ducts are way below the slab it may not be necessary and you could fill w sand top off with concrete.

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 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. 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. Functional troubles such as lack of air flow or collapsed ductwork and environmental problems such as.

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. When mixed with water it produces putty like mortar with good wash out resistance and a powerful bond onto wet concrete substrates. Foam may do the same thing. The forced air vents in our floor fill with water whenever it rains.

My slab from 1952 had dust neighbor has leaches. Vents buried below a basement floor are new to me. I have no idea who i should call or what kind of business does this type of repair work. The hard part is replacing the flooring itself.

Hvac ductwork in floor slabs. Old metal pipes rust out that they used for slab ducts. I did not have them do it cuz i have heard from others that they should be filled with concrete.