Electrical – Extend a wire that i had to splice to sister the floor joist is too short now

electrical

I had a rotten floor joist on the ground floor , i fixed it by sistering a brand new floor joist right beside it in the basement
But when i wanted to instal the beam , i had to cut the wire running through the old joist in order to place the new joist beside the old one Now the wire is too too short ,about 4 inches distance between the tips of the cut wires. And unfortunately no slack in the wire .
I thought about using two junction boxes to extend the wires in the ceiling .
Is there any better way to do this??
If not, once i put the junction boxes, can I use the cover plate on them and keep it behind a REMOVABLE drywall( i mean a drywall panel that has exposed screws that can easily be removed to expose the junction boxes in the ceiling.
Appreciate any thoughts
Thanks

Best Answer

2 junction boxes is there best approach. But instead of a removable panel, just get blank covers for the boxes and mount the boxes to the drywall. You also don't have to keep the wires in the same place they are now. You could cut more off and put the boxes farther apart, if that makes disguising the boxes easier.