I've got big challenge on building a single wall

Hi guys, Here's my case, i have a small room 20x10sq ft, my plan is going to divide the room into 2 room and then build a room within one of the room 9.5x9.5sq ft. 5" space between the isolation wall and the existing wall I have done the floating floor, but here comes my question. there will be 3 walls 5" from away from the existing wall, the single wall that i am going to build will be 2x 5/8" drywall --- insulation --- 2x 5/8" drywall which means i need to put the screw to fasten the drywall to the metal stud in only 5" space which is impossible i can't even put my hand there. Any solution? I have done one in another way, i build one wall in the center of the room so i have enough space to move and then i move it to the place, it is super super heavy, the drywall didnt crack when i move, but i want to have a better way to do it instead of moving the big heavy wall. and its too dangerous as well.. plz give me some solution.

Hi "redsoundco". Please read the forum rules for posting (click here). You seem to be missing a couple of things! :)

one of the room 9.5x9.5sq

That's a really bad idea! If you make your room square like that, all of your modal problems in one direction across the room ("length") will line up perfectly with all of the same modal problems in the other direction ("width"), so you will have terrible peaks and nulls in your low frequency response. Studios should NEVER be square, and no two dimensions should be within 5% of each other. You should search the forum for the term "room ratio", and learn how to set the dimensions of the room correctly, to avoid those problems.

I have done the floating floor,

How did you do the floating floor? Photos would be useful, or a diagram, as well as a description. And more important, WHY did you do a floating floor? Floating floors are almost never necessary (it's a common myth that studios need them). They are extremely expensive to do right, and if NOT done right, they make matters worse, not better. You should read this information on floating floors: viewtopic.php?f=2&t=8173

there will be 3 walls 5" from away from the existing wall, the single wall that i am going to build will be 2x 5/8" drywall --- insulation --- 2x 5/8" drywall

I'm not sure I understand what you are saying, but it seems like you are planning to build a three-leaf wall? That would also be a bad idea. Your walls should only ever be two-leaf, never one, nor three, nor four, nor anything else. If you have a three-leaf wall in your plans, that needs to be fixed urgently. Maybe you could show a diagram if what you are planning, so we can check.

which means i need to put the screw to fasten the drywall to the metal stud in only 5" space which is impossible i can't even put my hand there.

Once again, I don't think I'm understanding you correctly, but there should NEVER be a situation where you need to do that! If you are planning to build one leaf of your wall inside-out, then the normal way of doing that is to build it lying flat on the floor, then tilt it up when complete, but that does not sound like what you are doing. Please provide a more detailed description, and some accurate, clear diagrams so we can understand what you are thinking of. - Stuart -