I am in the middle of building a complex storage rack system in my garage. I ran 2x4 "sleepers" across the ceiling and tied into every floor joist. My shelving system is anchored to this.
Here is where it gets interesting. I did not think twice about this design because I assumed I was anchoring into 2x8 or 2x10 floor joists (room above garage) but when I cut a hole in the drywall to relocate a light fixture, I found I was tied into 2x4's. Basically I have 2 sets of joists. 2x10's above, then about 6 inches down, the 2x4's, 16" OC holding up the sheetrock.
The dimensions of the garage are about 20x20, but there is a beam in the middle shortening the span of said joists to 12ft. Has anyone ever seen/heard of this before? I can't understand what the reason for this design would be, other than the extra insulation that is in this space (im in Canada).
I am thinking of rather than ripping the shelves out and starting over, strengthening the 2x4's by tying into the 2x10's. Thoughts?