Do I Need Floor Joist Hangers Subfloor

If you need to cut through a joist firm up the floor as shown in fig.

Do i need floor joist hangers subfloor. In the past 2x4s or 2x6s were sometimes used as floor joists. However doing this does not fix the slant that the floor has taken since the old joists got damaged. If you re working on a floor in an older home you might want to consider adding a new layer of plywood over the decking. In buildings with basements the first level of floor joists serves the same purpose.

In cases where greater open spans are needed framers often use joist hangers which are u shaped hardware pieces that are nailed in to accept hold and support flooring joists. Dropped ceiling will only support new 5 8 blue board. Sometimes it s the subfloor that s the problem and not the structure under it. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction.

The only caveat to this is that you need to make sure you have enough space to add another joist. They are sometimes not required at the header if they rest on a nearby drop beam and you drive nails through the face of the header into the joists. This method of laying a sturdy subfloor on top of joists and then topping the subfloor with a cosmetic only flooring top creates a tighter stronger structure. It is flexible it can be changed out it is inexpensive.

Layering makes it easier to change the visible floor if you tire of the look or if it has become damaged. Sometimes the plans for a home may call for additional joists to be sistered next to the other floor joists for more strength. Are joist hangers needed at each. A cast iron tub with water and occupant can weigh in at more than 800 lbs.

The place where you ll be most tempted to create oversize holes and notches under the bathtub is the part of a floor you can least afford to weaken. True floor joist span calculations can only be made by a structural engineer or contractor. This size is no longer acceptable when framing a structure. It will update all the amounts needed but it won t take into account any joist that may have to be doubled and or beams that would need to be added because of this opening.

Floor opening if there is an opening in your floor enter the sq footage in the floor opening field. But even in that situation some inspectors will want to see joist hangers. Codes typically call for attaching joists with joist hangers at the ledger. Floor joists installed on second or third or higher levels double as ceiling joists for the level below.

I am framing a dropped ceiling below an existing floor assembly which is 3 off level over 20.