Well, I build a bulkhead around my cold air return in my 1/2 bath. What do you think? It's actually perfectly level and probably the most solid structure in this house. I also had to cut the studs it rests on in the back. It had a 2x3 that was nailed to the front and the studs just ended. The wall wobbled. I attached the far left stud you cannot see to the joist then cut 3" off of the two middle studs, attached a 2x3 to each end stud and then the two middles to the top plate. The wall is very solid now.
Now, time for my question. I need to build a bulkhead around my other HVAC vent that goes the width of the room. I am also building a partition wall with a bi-fold door. The red is where I need to frame. The blue is where I will frame the closet.
My question is how do I assemble this? How do I attach to the studs? Any advice?
what i do for drops is use 2x4 ripped in half nail one to joist the use 1/2 inch osb ripped to height of drop from ceiling towards floor then staple the other half of the ripped 2x4 then do the same on other side the connect sides to each other with bottom layer of 1/2 osb