Hi Dave,

In terms of soundproofing the floor of the bathroom you will need to look at our DIY floor systems if the neighbour is going to treat their floor. These can be seen here http://www.keepitquiet.co.uk/soundpro...

or our DIY ceiling systems if you want to treat your ceiling. These can be seen here http://www.keepitquiet.co.uk/soundpro...

With regards to the waste pipe in the box you will need to wrap our Soundblocker Quilt http://www.keepitquiet.co.uk/acoustic... around the pipe at least once and maybe secure it with our wire netting http://www.keepitquiet.co.uk/chicken-...

There may be other options for the downpipe so I would suggest you call our technical team to discuss on 0845 363 7131

I hopw this helps.