more on doors, 4-leaf system or not?

I remember reading that someone (Rod?) suggested using a hollow core door with OSB added to each side in place of a solid core door for better soundproofing. My question is - if I do that and then add another set of doors, leaving a 6 inch gap between them, would that create a 4-leaf system? If so, would it be better to use two solid core doors with an air gap or one door of the above construction? I hope that makes sense. Thanks! Scott

I'd always start with a solid core door.

Nope- was not me. I agree 110% with John (not surprisingly) always start with a solid core door..... Rod

Thanks, gentlemen. In looking at other door threads and it looks like some people are installing doors that are amazingly heavy, like 300 lbs. Maybe I'm missing something, but the same area of wall covered by 2, 5/8" sheets of gypsum would only weigh about 90 lbs. I'm figuring the 5/8" gypsum to weigh about 2.5 lbs/sq. ft., each sheet. Of course that's for only one side of the wall. Are they using such heavy doors because they are only using one door as opposed to two with an air space between them? Thanks, as always! Scott

plus6vu wrote:

Are they using such heavy doors because they are only using one door as opposed to two with an air space between them?

Without links to the specific threads, yes. Andre

Sorry about not having the links, but thanks for the reply. That seems to make sense. Scott

You use heavier doors because the door "system" is not PERFECT like the wall.. ie. its not perfectly sealed so you need to compensate for that. A 55 stc rate door will eventually perform 40 with a decent sealing system and so on. thats why