Ok, so everything was going reasonably well with refitting the bathroom until this.
The 'plughole' of the bath is above a section of floor that is directly above the main feed and return circuit to boiler.
From the bottom of the bath to the top of the floor I have about 125mm, and basically that is not enough room for me to fit the banjo / pop-up-plug connection AND one of these traps:
I have seen one of these which may take up less space:
But now comes the questions.
My waste is of single pipe design, that is an internal soil stack that everything flows to.
As I understand it the regs stipulate that the bath must have a minimum 'seal depth' within the trap, and neither of the above traps will give it. Apparently one way to achieve this is to use a shallow trap at the bath, then run the waste pipe to a clearer area, and use an inline trap to give the correct seal depth, and then onto the soil stack from there.
This work around sounds like the most promising solution to me, but I have a couple of questions;
The waste pipe goes from the bath, and travels under the floor, with the basin waste T-ed down into it, and then goes into the soil stack.
Obviously the basin will have it's own trap, so not an issue.
If I have a shallow trap at the plughole, and then a deeper trap further on before the sink 'T' am I going to be at risk of basically having an airlock between the shallow bath trap and the deeper one, and then have problems with the water draining?
If I am having a deeper trap later in the pipework, do I even NEED a shallow trap directly under the plughole of the bath, or would a 90 degree elbow be ok into a length of pipe that then feeds into the deeper trap?
Many thanks
The 'plughole' of the bath is above a section of floor that is directly above the main feed and return circuit to boiler.
From the bottom of the bath to the top of the floor I have about 125mm, and basically that is not enough room for me to fit the banjo / pop-up-plug connection AND one of these traps:
I have seen one of these which may take up less space:
But now comes the questions.
My waste is of single pipe design, that is an internal soil stack that everything flows to.
As I understand it the regs stipulate that the bath must have a minimum 'seal depth' within the trap, and neither of the above traps will give it. Apparently one way to achieve this is to use a shallow trap at the bath, then run the waste pipe to a clearer area, and use an inline trap to give the correct seal depth, and then onto the soil stack from there.
This work around sounds like the most promising solution to me, but I have a couple of questions;
The waste pipe goes from the bath, and travels under the floor, with the basin waste T-ed down into it, and then goes into the soil stack.
Obviously the basin will have it's own trap, so not an issue.
If I have a shallow trap at the plughole, and then a deeper trap further on before the sink 'T' am I going to be at risk of basically having an airlock between the shallow bath trap and the deeper one, and then have problems with the water draining?
If I am having a deeper trap later in the pipework, do I even NEED a shallow trap directly under the plughole of the bath, or would a 90 degree elbow be ok into a length of pipe that then feeds into the deeper trap?
Many thanks