Hi

Can two 100mm WC branches be connected into the stack at the same
vertical position if they are at 90 degrees to one another ?

I'm aware they have to be offset if connected directly opposite each
other, but what about at right angles ?

E.g., where O represents the stack:-


WC-----O----WC must be vertivcally offset

WC-----O ?
^
|
|
|
WC

Having perused the building regs., I'm none the wiser, so all advice
appreciated.

TIA,
Gareth.