If you're doing my idea of routering a rabbit / dado on the edges of the studs then dropping in the plywood, it would not take much extra work to do one side, then slide some 5x5 metal mesh with spacer rods, then do the same plywood on the other side. You now have a framing for dropping in fiberglass reinforced concrete. Assuming a concrete slab, no weight issues and a damn durable wall that is good to stop anything short of multiple hits with 30-06 AP. Unless they get lucky and hit the 2x4 at a direct angle.Netpackrat wrote:If going to the trouble of taking off sheetrock, adding plywood, and filling with sand, you could make a mold for reinforced concrete blocks sized to fit between the studs. Pour them in the garage, hand cart them into the house, and lay in place when the interior sheetrock is out. Seems like that would be better than sand.
Now you have Reinforced cement protection.
Although, I really think the way to go for suppression / deceleration of incoming rounds through interior doors is to use 1/2" lime rock / marble / granite chips (depending on what is cheap locally) dropped in the space between the layers of plywood. It's cheap, its easy and its fairly self healing.
