I am creating a first floor internal bathroom i.e. no external wall. The wc which connects to a 110mm soil pipe has a run of 2.20M to an external wall. The soil stack is about 2.5M further along the outside wall, making a total run of 4.5M. I would like to connect the basin and shower/bath waste pipes to the soil pipe (running between the floor boards and the ground floor ceiling) before it reaches the external wall. There is not enough space between floor boards and the ceiling to use a manifold. There is not enough room to connect the basin and bath wastes into the top of the 110mm soil pipe. Can I connect the basin and bath wastes into the side of the 110mm soil pipe under the floor boards? If not, what other options are there?

Many thanks for your reponse.
Just to be sure I use the correct fitting would a

GREY 4" x 45deg TS BRANCH
Ref: SL065

Grey 4 Inch Soil 45 Degree Triple Socket Branch

Found at: http://www.plumbingworld.co.uk/onlinestore/Online_Store_UPVC_PUSHFIT_SOIL_SYSTEM...

be the item I require? If so would I be able to connect both basin and bath pipes into this i.e. connect them together and then into the end of the 110 soil pipe with a reducer to 50mm pipe? Or is there a better way.

Thanks again.

Stephen

Again many thanks for this I will look at the situation today and see which way to go.

Stephen