Slats done backwards - help me out of this jam

I have about 7 slat modules (2'x2') thay have slats but no backs. Anyway, what is the best way to make these "airtight" now? I am thinking of using weatherstrip foam between the frames and the plywood backing. Any ideas? I could put caulk down, but I am not sure if it would do much.

Aloha, I put a cleat running along the inside of the frames; set to the thickness of plywood backing, then screwedl the plywood into place. If you desire a more airtight seal, you could run a bead of caulking along the joining surfaces of the cleat and plywood, and then screw/nail into place. Hope this helps, Aloha 8)

maybe I was overthinking. For some reason I was thinking the caulk wouldn't touch the 2 surfaces but, it avtually may be better this way getting in between the grains. Thanks! :D

sorry, i didn't understand what a cleat was at first. I am getting over my head and didn't think this would cost this much. I like the cleat idea, but I want to avoid buying more wood. Woud a flush seal work with caulk applied directly on the frame back?

shameless bump :oops:

Could you post a pic or make a diagram of "as is", the plan or whatever. Caulking a gap correctly (using backer rod and maybe multi rows of caulk/backer rod) between two solid joined materials will proivde an air tight seal. Marc

Thanks, it's pretty simple. The frame lumber is 3/4" wide and shaded are the slots on opposite side. I have playwood backing cut to the preimeter of the frame. Plywood is going to be screwed or nailed down to the frame. I never knew what a backing rod was until now. Plain Butyl caulk between won't seal then? I have a bunch of weatherstripping......seems like similar matereal as backing rod. BTW, Kendale -thanks for the sugestion it took me a while to see what you were saying, but I am cheap. Especially since I got a bunch of Clear pine for slat 1x2's.