how to plumb/frame toilet waste in a timber frame base layer

[jpadie]

hi all 

 

I'm thinking of allowing for a shower room and loo in a garden room project I'm in the middle of.  the loo will be in the second bay from the bottom left.  the waste will exit just behind the bottom left foundation block below the floor joists.  that's a good position for the soil stack and easy access to existing pipe work to the main waste.

 

the insulation goes between the joists here.  I've currently left this bay uninsulated as I am unsure how to frame the area to receive the waste pipe and stop it physically dropping in the void below.  

 

is there any standard practice here?   

 

thanks in advance! 

[jpadie]

please ignore.  i've had to move on and used some plastic brackets to support with no extra framing.