Hi
  Does anyone know what the thickish black rubber/butyl sheeting is called that is used in the construction/building industry? It is similar to the stuff that is used for pond lining but much thicker.
  I have had a peice of it down on my concrete kennel floor for many years,an it has been brilliant for cleaning an insulation,but it is starting to deteriorate an need to get some more but,for the life of me I cannot remember what it is called.(think the old grey cells are going a bit lol)

Many thanks

Don't know the stuff you are talking about but have you tried this:
http://www.kraiburg.co.uk/
It's for stable floors and is by design very hard wearing and durable and great insulation.
Aileen.