Gap around Internal Soil Pipe

Hi,

Yesterday what started as me changing the "donut washer" on our downstairs toilet ended up with me having to replace the pan and cistern. To do this I had to remove all the 'boxing in' around the pipes so the new toilet would fit. Lots of tidying up to do now....

But in the course of doing so I noticed lots of rodent droppings around the internal soil pipe and there is a big gap between the concrete floor and pipe. Also quite a draft.

The construction of the floor is block and beam with a pretty thick screed on top, which looks very grainy, almost like grey tarmac.

Can I pour concrete around the pipe to seal it off or will the concrete corrode the pipe over time?

Thanks,

Matt

You could concrete it - it was probably forgotten when built

Just get a bag of readymix from one of the sheds.

Jay