Waste from middle of kitchen

[marlb]

Hi all,

I am in the process of re-fitting a kitchen. I want to have an island sink unit but do not know the best way to get rid of the waste. I will be laying new floor tiles anyway so was looking at maybe going under the floor to the gully outside the kitchen. There looks to be a spigot on one side of the gully. I do not want to have to pump the waste out. Is this the best route to take? I am worried about going through the damp course. If this is the best route to take, can you tell me the the drop i need etc. The sink will sit approx 1.8m from the gully outside.

Cheers.

 

[Softus]

I do not want to have to pump the waste out. Is this the best route to take?

Er, you have only two choices - above floor level or below.

I am worried about going through the damp course.

How high is your finished floor level above the DPM?

If this is the best route to take, can you tell me the the drop i need etc. The sink will sit approx 1.8m from the gully outside.

The gradient should be a minimum of 20mm per metre, so for 1.8 it would be at least 36mm. You should use waste pipe no smaller than 40mm (internal diameter).

 

[megawatt]

I haven't come across many island sink units other than in new build and maybe this is the reason

What about redesigning to have it somewhere else ... In front of the window is the usual place?

MW

 

[Softus]

I haven't come across many island sink units other than in new build and maybe this is the reason

Probably - the bottom of the waste pipe (in this scenario) would be at least 82mm below the underside of the tiled surface by the time it reaches the external wall.

 

[John M]

Get the pick & shovel out ....... another 2/10 for planning