Greetings,
I’d like to remove some band joist under a doorway for HVAC return air to an addition.. The duct will be worked into box stairs. The doorway is in a load wall, and the header for the doorway is an LSL. Assuming some band removal between the floor joists (marked in yellow) is OK, how much can i take out? I’d leave the sill alone.
Thanks in advance!!
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Replies
THe area in yellow is carrying NO LOAD at all.
ANd since you say there is a sill under teh band joist, then all floor joists in the floor below the dorr are bearing on teh sill and not hung on teh band joist. So if no joists aer in your way cut away on the band to your hearts content.
All that said it is very possible you ahve not told us something or I have made an incorrect assumption some where.
So if you explain more precisely what is under the door way we can be more sure of our answers
Thanks DoRight,
The band, sill and joists (ends in yellow in photo) are all original 2x10s in good shape. Its traditionally built with joists on the sill and band at the ends of the joists. 3/4 pine subfloor above then 3/4 t&g oak floor above that.
Given some of the other issues going on, that entire wall will be getting a 1/2 plywood skin as well.
Enjoy the day; Thanks again!
Well, I wouldn't say no load. It depends on how fat the person is stepping on that threshold.
Actually
Hey sunsen:
Good call actually. If the subfloor were to end at the threashold and the band joist removed, it is possible that subfloor at the threashold could be spongy. One might want to put a block on teh flat in that bay at the threashold. Even a 1 x 6 on the flat glued and pinned, but I would go with a 2 by.
Yep, it's not clear what is supporting the threshold, and the flooring immediately adjacent to it. These need to have adequate support. And one should consider that the joist is also resisting tension/compression. In particular I see a joint in the sill just to the right, so it's possible that, if cut, the joist could pull apart.