I have a standard pedestal washbasin which is leaking from the wastepipe. Looking down the plughole reveals the problem. Sealant between (I think) the wastepipe and part of the sink below the plughole has come out. I can't examine it properly as the pedestal is in the way, so my first question is, can I assume the sink is firmly attached to the wall or do I need to support it when I remove the pedestal? If so, how? A chair on each side perhaps? My other question is what will I need to do the job? The plastic U-shaped wastepipe looks like the sort of thing I can get at B&Q, but will anything else need replacing, e.g. peering round the pedestal I can just make out a black rubber seal right at the top which suggests there is a separate piece of piping or hardware sitting between the basin and the plastic wastepipe. Also what do I use for sealant and should I get it in a tube or pot or something else?
Hope someone can advise on this!