How to reinforce drilled floor joists
peternoon
floor joists, that have been drilled off limits for services, as
follows:
Joists are H8.6" x T1.8"
The holes are round, 2" diameter
One hole per joist off limits
But they are close to the span end and are off-centre relative to the
joist height (1" average)
If anybody knows of existing material or parts that can be used, I
would appreciate it even more if a web link or company name were
posted on this thread
Thanks
Robert Allison
You say you have about a 1.8" x 8.6" piece of lumber that has a 2" hole
in it? You don't need to do anything if you are going to use it as a
floor joist.
--
Robert Allison
Rimshot, Inc.
Georgetown, TX
GHooper
3/4 plywood gusset 48" long, both sides of the FJ glue and screw...
"Robert Allison" <rims...@verizon.net> wrote in message
news:lS4sj.1648$gg1.1422@trnddc01...
Bobk207
> but to answer the question,
> 3/4 plywood gusset 48" long, both sides of the FJ glue and screw...
>
>
> news:lS4sj.1648$gg1.1422@trnddc01...
>
> > peternoon wrote:
> >> Can someone tell me what is the correct way to reinforce some timber
> >> floor joists, that have been drilled off limits for services, as
> >> follows:
>
> >> Joists are H8.6" x T1.8"
> >> The holes are round, 2" diameter
> >> One hole per joist off limits
> >> But they are close to the span end and are off-centre relative to the
> >> joist height (1" average)
>
> >> If anybody knows of existing material or parts that can be used, I
> >> would appreciate it even more if a web link or company name were
> >> posted on this thread
>
> >> Thanks
>
> > You say you have about a 1.8" x 8.6" piece of lumber that has a 2" hole in
> > it? You don't need to do anything if you are going to use it as a floor
> > joist.
>
> > --
> > Robert Allison
> > Rimshot, Inc.
> > Georgetown, TX
OP-
Per Robert's comment "a 1.8" x 8.6" piece of lumber that has a 2"
hole in it? "
is not in need of repair.... as long as .....
the hole is not in the middle third of the span (& its not since you
state "close to the span end")
and not too close to the end of the span.......how close to the end of
the span? 12"? 6"?
addtionally, if you've still got ~2" of wood from the edge of the
hole to the top or bottom of the joist, you're fine
The hole is not in a zone where bending is a huge issue & you've only
removed 2" of wood.
personally I think some code allowances for holes in joist are a
little too generous
if you insist on a repair, I'd use 2 pieces pieces of 3/4" plywood
10" to 12" long x ~8.6" high (one each joist face; glue & staple or
brad nail, 16 gage)
fwiw, I reinforced an ~ 4" x 6" oval hole in the lower corner of a
4' x 8' shear panel by gluing & stapling a plywood "doubler ring
reinforcer" over the hole. The rectangluar size of the "ring" was ~
12" x 12". Worked fine, hole & reinforcement did not fail when shear
panel was cyclically tested to failure.
cheers
Bob
peternoon
Yes, the only worry is that the distance from the hole centre to the
span end is 3.7" only
Bobk207
>
> > and not too close to the end of the span.......how close to the end of
> > the span? 12"? 6"?
> Thanks all for the feed-back.
>
> Yes, the only worry is that the distance from the hole centre to the
> span end is 3.7" only
>
>
That is a little close but you've a lot of wood there.....
when you say 3.7" to hole center line...does that mean you've only
2.7" from the edge of the hole to end of the joist?
What's above it? What kind of bearing forces are in the joist?
New / ongoing construction or remodel?
I'd still be inclined to forget about it.....
you know, your repair really won't take much force unless you "unload"
& shore the joist, install fix, let glue dry, remove shoring.
Just slapping doublers over the hole doesn't make them take any load &
since you're not in earthquake country, the load the joist sees now is
pretty much the load it will see forever (unless construction is
ongoing)
cheers
Bob
vcmg
http://www.thestuccocompany.com/construction/Re-How-to-reinforce-drilled-floor-joists-12562-.htm
:
This is an old discussion, but I found this on the web when I was looking
for floor joist repair solutions.
<a href="http://www.metwood.com/">Metwood</a> has a joist reinforcer
product that can actually be ordered online at their store if you input
the dimensions etc.
What's great is you can use these to run utilities through the joist while
reinforcing it
Bobk207 wrote:
> OP-
> cheers
> Bob
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