Running Ductwork Through Floor Joists

Is it safe to try and pass the hvac ductwork through the bssement ceiling first level floor joists.

Running ductwork through floor joists.

In this case it s big enough that there s even a joist running right through the middle. Attics can be problematic when insulation is located in the attic floor rather than in the rafter bays or better yet outside the roof sheathing. Is that a towel in there. If there is enough room up in the joist bays yes you could run the duct work up there.

I used a 6 hole saw to run a new duct into an addition we built. Viewed 2k times 0. As part of finishing my basement i want to improve the head room. Position bathroom vent fans so the ducts can run parallel to the joists right up to where they exit the house.

If you need to cut through a joist firm up the floor as shown in fig. Ask question asked 1 year 8 months ago. Make sure the studs and bays line up well enough to leave a clear path. Just be sure to get the sizing sorted out correctly ie a 12x12 duct cannot be replaced by a 3x48 duct same area as there s a lot more friction in the 3x48 but the correction factors for duct shape are surely.

To minimize problems with ductwork. Rather than try to run the flex duct through it which would have required at least another 2 i put a 1 long section of 6 rigid duct through the hole and attached the flex to both sides of it. But if i add a 5 booster fan would it be possible to retain proper air flow and route this duct through the joist. Ducts should be able to run between studs in the wall and then turn into a joist bay the space between two joists.

The hole cannot be larger than one third the depth of the joist so the maximum hole size for a 2 12 joist actual size 1 1 2 x 11 1 4 in is 3 3 4 in. Active 1 year 8 months ago. You can drill the holes anywhere along the length of the joist first photo. What the installer did here was to screw a piece of sheet metal to the bottom of the joists and attach a duct to it to carry the air back to the hvac system.

You may be able to work with a wide shallow duct so you can have a broad not too deep soffit for the cross joist duct run. Is it possible to run an hvac duct through a floor joist. The problem lies when you come across where electrical. I understand that the maximum size hole i can put through a 9 floor joist is 3.

As we look closer here s what we see in this house.