i'm having trouble with rod's assertion that with a heavy enough door and great seals you can use one door or window jam through both walls of a double wall mam system.
maybe someone could explain to me how this hard coupling between two leaves isn't a gigantic weakness in isolation, as the concept goes against one of the main principles in sound isolation, total decoupling of leaves.
i would love to embrace this idea because it would make door frames much tidier, please help me understand
one jam through double walls?
Originally posted at johnlsayers.com, topic 9168.
I've had the same concern. And I'm not questioning Rod's knowledge but I guess I need further explanation of
why it doesn't affect the transmission that much.
It doesn't make sense to my feeble mind.
Thanks
For my window construction, I am not going to link the 2 leaves, but keep them separate. Rod's book shows plans on how to do this.
The doors however are another concern! I have heard Rod explain this before, and I remember being satisfied with the response, but for the life of me, I cannot remember his reasoning! If we are going to trust someone's designs, Rod is the guy, that is for sure!
Reality is that the connection is such a small amount of the whole that the TL loss from the coupling doesn't amount to a hill of beans.
It's one of the areas that I continnually tell you in the book - if you have to live with it - live with it.
NOW - I will also point out that my concern for this really comes down to when double 2x4 walls are used - as I do not trust a single 2x4 structure to satisfy the load requirements for one of these doors. In that case I insist in using the frame as a double brace - and count on the 2 wals to keep the frame intact.
However, if you are using double 2x6 or 2x8 construction then I have no problem with a split frame being used.
I have a details for a double door assembly using split door frames with 2x6 walls if anyone could use them.
Sincerely,
Rod
Thanks Rod, I'm sure you said this in the book but I couldn't find it.Reality is that the connection is such a small amount of the whole that the TL loss from the coupling doesn't amount to a hill of beans.
Well even if we can't use them, I'm sure we can learn something from them. I'd love to see them. Thanks, KenI have a details for a double door assembly using split door frames with 2x6 walls if anyone could use them. Sincerely, Rod
is this the case even with a small room?
I just don't see it yet, in Rod's book he states "tests have proven" but i can't find any data.
using this logic, why use resilient sway braces? a solid sway brace every 4-8 feet is less square foot of hard coupling by far than just one door frame.