Hissing buzzing sound coming from lead pipe

[acerf1]

I get a very loud hissing buzzing sound coming from a lead pipe when my next door neighbor flush his toilet. Only last until his toilet fills up.

I have end Terrence house , the water supply is shared , the pipe in question comes off the mains of my neighbor house and feeds the toilet and sink in my house , i have separate stock for the rest of the house.


also I seem to have low pressure compared to his house and damp brick on the outer wall.



I have tried listing to my mains stop cock can't hear anything , and I also tried listen to stopcock which comes in from the next door neighbor still can't hear anything which.

any ideas on what it could be?

 

[HERTS P&D]

There is a leak, where is the damp patch?

Andy

 

[acerf1]

on the wall 1 meter away from the pipe

 

[acerf1]

damp path rising from the bottom of the wall

 

[HERTS P&D]

Is it the neighbouring wall? if so, go and speak to your neighbour.
If you are a tenant then speak to your land lord.

Andy

 

[acerf1]

no my wall, fells like to me the if it was water is running to lower ground toward the main drain