Plumbing

New attic conversion, blocked ensuite toilet/waste pipe

Anonymous user 16/03/2024 - 2.44 PM

Hi, we recently had our attic converted to a 3rd bedroom with a small en-suite in our mid sized Victorian terrace. The bathroom was finished 6 months ago but because we've not had time to finish sanding/filling and decorating and laying carpet, we're not using the room yet other than the new under eaves storage. We go up to use the toilet a few times a week on a night mainly for the kids as it's the closest toilet. We flushed the toilet as usual the other day, and raw sewerage came up through the shower waste pipe and flooded the shower tray which I'm told is 'bossed in' to the toilet waste pipe under the floor. Everytime you flush the toilet this happens and then gradually the waste in the shower tray goes down. The fall from the toilet/shower in the attic is approximately 5 metres to the back of the house, where the pipe then goes outside of the house and goes through an angled pipe, and follows the angled first floor entended bathroom roof down, and through a second angled pipe and then along the side of the first floor bathroom exterior wall, until it finally meets up with the exiting soil stack (connected to first floor bathroom), and goes vertically down into the underground drain. If the correct diameter waste pipe has been used in the new attic new, is the problem the lack of 'fall' or angle of the waste pipe that travels 5 m is not sufficient and so the waste is not being disposed of properly? Thanks in advance for any suggestions