Horizontal Soil Pipe connections

[Old Miller]

I am refurbishing a bathroom and adjoining en-suite which back onto each other and are on the first floor of the house. Both have a toilet, washbasin and shower. The showers are electric and the flow rates are not excessive. There is a straight horizontal soil pipe (with appropriate slope 1:40) that runs behind a stud wall, from the en-suite through the bathroom before it exits the the building through the outside wall where it connects to the vertical soil pipe. The total length of the horizontal 110mm pipe is 3metre and it has an inspection/rodding point when it leaves the houses accessible from the outside. Currently the toilets back onto the soil pipe (they are about 2m apart) and connect to it with short fittings.
I would like to connect the wastes from the the wash basins and showers seprately to the horizontal soil pipe, with suitable fittings. The waste from the wash basins (32mm) have about a 1 metre run, the bathroom shower (40mm) a 600 mm run and the ensuite shower(40mm) about a 1200mm run. I was intending to use wirquinn shower wastes and similar type wastes for the wash basins to prevent the smells from the soil pipe.
Are my plans realistic, are there any issues I need to address?

 

[Timmy D]

I see no issues, just make sure you adhere to connection spacings.

 

[Old Miller]

I see no issues, just make sure you adhere to connection spacings.

Thank you for your reply... where can I find details of the spacings?

 

[Timmy D]

Thank you for your reply... where can I find details of the spacings?


Off the top of my head, I think soil pipe regs are in the building regs approved document H. It’s free access on the gov website.

It’s also got details of discharge flow rates/design etc.