I have a heating duct in the ceiling (joist space) above the studio area in my garage and I am creating the first mass layer inside the ceiling joist space for my first leaf. I was wondering if:
I would replace the round duct with a square duct close to the underside of the upper floor and then create my first mass layer below the duct. I would be placing 4 layers of drywall below (3 @ 1/2" and 1 @ 5/8") below the duct and within the joist space. The idea would be to have the duct on the other side of the 1st outside mass layer therefore eliminating it as a concern for the transmission of sound.
Would this still be considered a two leaf system ?
My concern is the floor above the joist space which consists of 3/4" plywood and nailed down walnut hardwood flooring creating a 3rd leaf. Note that the duct run is direct and straight out of the furnace so there is no concern whatsoever in terms of flow and/or losses due to the transition in the ductwork (lots of flow in this run).
Thanks in advance.
Danny
Would this be considered a 2 or 3 leaf?
Originally posted at johnlsayers.com, topic 11818.
I'm not sure I understand what you are trying to describe. Maybe you could do a quick-n-dirty model in SketchUp, to show what you have in mind? It sounds like you are going to make a 3-leaf, but I'm not clear on the plan. They say that "a picture is worth a thousand words", so I guess a 3D model must be worth quite a bit more! - Stuart -Would this still be considered a two leaf system ?