As a remodeling contractor and carpenter one common structural framing issue i see alot of in bathroom remodeling jobs are floor joists that were cut drilled notched or need to be cut out to accommodate plumbing pipes and drains.
Floor joists cut.
To minimize problems with ductwork.
Driving 16d common nails in old hard wood is difficult.
Then use pry bars and your reciprocating saw to pry and cut the floor joist away from the subfloor.
Problems can occur if framing is cut to make room for.
Start by cutting out a small 1 2 in 2 5 5 1 cm section of the floor joist with a reciprocating saw.
Then attach the sister joist using three 16d common nails driven every 16 in.
A nominal 2 8 board measures 1 1 2 by 7 1 2 inches cutting the new joist.
When the sagging joists are level apply a generous bead of construction adhesive to the existing joist.
In situations when sistering damaged floor joists with lumber of similar dimensions it can be easy to notch and slide the sister board into place.
This will create a weak spot.
If you need to cut through a joist firm up the floor as shown in fig.
Apa performance rated i joists pris are manufactured in accordance with pri 400 performance standard for apa ews i joists form x720 this performance standard provides an easy to use table of allowable spans for applications in residential floor construction allowing designers and builders to select and use i joists from various member manufacturers using just one set of span.
These joists may need reinforcin g to reduce bounciness sagging or excessive deflection in the floor or ceiling.
But it s usually best to run the sister joist over the entire span.
If the cut outs are too large or in the wrong location the joist can be weakened and unable to support the load it was designed for.
Make sure not to install joists so they run parallel to and directly under walls where you intend to install ductwork.
The space between the beam and the floor boards above was 7 inches so i decided to use regular framing lumber and rip a 1 2 inch off the width of a 2 8 framing member.
Sometimes joists are notched at the end where they bear on a wall or sill.
Cutting and or removing joists to provide an entry or access can be the most difficult part of the overall project.
Floor joists can also be attached to a full depth header rim joist or to an adjacent stud.
In order to maintain the support integrity of the ceiling or floor joist or rafter system it is important that if joists are cut that the load that was bearing on those joists be transferred to a modified support system.
Trusses structural composite lumber structural glue laminated members and i joists are exempted from this requirement but must be supported according to the manufacturer s recommendations.
Pry the floor joist from the subfloor with the back of your hammer.
It is very easy to over cut the notches and remove the waste in two swift cuts but over cutting the notches in this manner weakens the structural integrity of the replacement lumber.
