Notched Joists - help
Notched Joists - help
(OP)
Instead of drilling holes into our ceiling joists (putting in a bathroom/closet in the attic) my plumber actually NOTCHED out holes from the top of several joists!
In order to resupport these beams, can I just add on sister joists?
In order to resupport these beams, can I just add on sister joists?
RE: Notched Joists - help
Depending on the amount of space you have over the you may be able to sister a 2x something between the pipe. I've recently used a small angle secured and dapped into the joist in conjunction with 'glulam rivets'. Notch, hopefully isn't near the support...
Also some codes limit the maximum depth of a notch.
RE: Notched Joists - help
Is it causing a noticeable weakness?
Keep in mind the flooring can be a reinforcement, if done correctly. If the area is to be sheathed with plywood, you might consider glueing it down, and using a closely-spaced nailing pattern. You might also consider screws instead of nails.
RE: Notched Joists - help
Here are typical code guidelines for notching:
Never in the center third of the span.
Only in the outer third of the span.
No more than 1/6 depth of joist.
Holes need to be 2" from either edge of joist, the diameter no more than 1/3 depth of joist.
Pg 111,Residental Framing, William P. Spence 1993
Book availiable at 'big box' home improvement stores.
RE: Notched Joists - help
If it is a 'normal' floor arrangement and the notches are in the middle third but less than 1/4 of the joist depth then doubling up with joist of the same width and grade as the existing will be satisfactory provided the depth is greater than 3/4 of the existing.
Otherwise get professional advice.
Just for information notches are generally preferred to holes in beams near supports, the maximum shear stress occurs at the middle of the joist.
RE: Notched Joists - help
-Richard L. Flower, P. E.