If you find joists in the house that have notches cut out of it on top
but with no pipes going through it, would it be a good idea to drop in,
screw in and glue wood pieces cut to size to fill the notches?
I am under the amateur assumption that a 2x10 floor joist holding a load
will be under tension at is bottom side and under compression on the top
So would filling the 1" cube notches on top of the 2x10 joists restore
the joist in anyway to 100% of its load carrying capability?
I was always taught to NEVER notch a joist. Drilling the middle was
acceptable. Notching the top or bottom just reduces the strength of the
Your concept of filling in the notches, is not going to do any good in my
way of thinking.
Best to get a carpenter out and see if there are any real issues. It might
be time for a structural engineer.
It is sometimes in compression at the top, but it really depends on
where the supports are. Imagine an upright T shape. The ends of the top
droop, stretching the top of the joist. Same reasoning applies at the
top of the beam near a center post support.
Yup. RicodJour is right -- there are a couple of assumptions. I should
probably have just left it at "it depends, but often yes" as the
correct answer to the question about compression at the top of the
If you are worried about it, fasten a sister board to the notched joist.
But don't use too many fasteners. Each one puts a hole in the joist and
that weakens it too. Something else to keep you up at night!
I think if I found some that had been there for a few years I would ignore
them and worry about something else.
Not sure you expressed it correctly but I agree with your statement that the
load on the joists should tend to compress the gap because the force is
The same principal applies to the other thread in this group. If the
plumber cut a 1" notch and placed a 1" iron pipe in it there is no problem.
Depending on how you did it, possibly, but it's simpler and more of a
sure thing to sister the reinforcement.
That sounds like you believe that a round pipe in a square hole would
restore the strength of the joist. Is that what you're saying? I also
need to find out who this plumber is that cuts a perfectly snug notch.
Every plumber's work that I've ever seen has been a wood butcher of the
highest order. Half-jokingly I tell some of them that on the next job
they can run there pipes and I'll frame around them, because after
they're done it's what I have to do anyway.
It certainly couldn't hurt.It probably would do more good if you can
"unload" the joists first.
How about truss plates? Anyone think they would be of benefit? I've been
thinking about this for the bottom of some joists that someone previous
notched in my house.
The plug would have to be a perfect fit and you'd have to manage to
transfer all shear across the bottom of the cube to the joist. That
would mean either sufficient screws and/or an adhesive that is both
sufficiently strong and a comparable elastic modulus to the wood.
If the upper chord is in tension rather than compression, then you'd
also have to provide a tensile connection between both sides of the
cube and the joist where they contact.
It would be easier to sister the joist. It would be easier still
to avoid notching the joists in the first place. Why are there so
many dumb contractors in the first place? I once had a house where
the contractor that converted the house from hot water to forced air
heating (decades ago) had cut several joists along one wall to fit 4"
ducts! (and then didn't place the ducts there). I had to sister the
joists - they had been ignored all those years.
Later in this thread you mentioned that sister boarding is not an
option due to space.
This is just a thought.
Have you considered using 1 1/2 inch angle iron across the bottom of
the joist? A four foot long piece with six holes drilled in it large
enough to accept an 8 X 1 1/2 wood screw would surely recover the
strength of the joist.
If you only have a few joists to " fix " use the whole 8 foot length.
Run the screws in straight up through the bottom and let the " side
piece of the iron float against the side of the joist. At most you
loose 1/4 inch on the side and bottom of the joist. I don't even
think it would that much but I am not sure how thick the steel in 1
1/2 angle iron is ( 3/16 1/8 ???? )
Like I said... Just a thought.
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