pipe work

[harrison_633]

Hi every body

I have a 1960s detached house.It has an extension to one side, and the floor is concrete aprox 4"below the house floor. In this extension is a shower room with a toilet & macerator. On lifting the ceramic tiles i have found a channel containing the drainage pipes covered with sand.Can anybody tell me if this is ok or do i have to arange new pipe work.any help would be most appreciated.

 

[hi-spec plumbing heating]

is it working ok?

 

[harrison_633]

Thanks for your reply. It works ok but my concern is what to do if it gets blocked, after laying a new floor, as there are no openings for roding.And the stack is on the opposite side of the house