Floor Joist Splice Detail

It would have been easy to do it.

Floor joist splice detail.

Then set new joists same height as existing ones alongside the old. Also install diagonal blocking to keep the entire frame from racking. If additional holes are required beyond the scope of the field cut holes table in the floor system contact a licensed professional engineer for guidance before cutting. Use narrower lumber 2x8 blocking on 2x10 joists so the blocking looks less conspicuous from a distance.

Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall. Believe it or not this kind of poor workmanship is not that uncommon. Tack a beam under the sagging joists.

Drooping and joist sag can be seen in the photo. No splices in studs joists or other load carrying members may be made without prior engineering review and specific details for any such splice s. 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. Here is a pathetic attempt to splice some floor joists under the bathroom.

And that leads to a wavy deck surface. A day until they re level. To help keep joists flat always attach blocking perpendicular to the joists.