I am currently framing my own house & the plans call for double joists under some of the partitions – one of which I planned to use for running my plumbing.
Is there a way to go about this that would allow DWV lines to run down through the walls? Is it permissible to offset the doubled joist so that the partition sits immdiately adjascent to the sistered joists or what about placing the joists 6″ apart instead of sistering them (partition above is 2×6) to allow the DWV pipe (4″ schedule 40 PVC) to run between them?
Replies
How about putting the joists 3 1/2" apart so the wall framing above exactly lines up with the space between the joists, and use short pieces of 2x4 vertically as blocking between the joists? That gives you a clear shot for your utilities and good support for the wall above.
-- J.S.
Either John's way or header the double off on both sides of the pipe.
You're talking about a non load bearing wall.
You don't want the wall to "settle" into the ply between to joists and "sink".
I usually block between the joists with similiar material every 3-4' and on each side of an opening.
Eric
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I like to have doubled joists centered under bearing walls, but if the bearing wall is also a plumbing wall, we'll space the joists to the width of the wallframe above, usually 3-1/2 inches. In your case of a 2x6 interior bearing wall above, we would put a 4-1/2 inch space between two joists, the space centered under the wall.
Doing that will allow plenty of room for your plumber to run his DVW up between the joists and through the floor deck and wallplate.
With a 2x4 wall sitting atop a 3.5-inch space, we need to angle our nailers when shooting down the wallplates. You won't need as much an angle.
Remember, of course, to not put a stud right where that stack is!
Thanks everybody