I'm about to fit a new hard wood floor in my hall in which the heating pipes run under the floor boards. Is it worth insulating these before I put the new floor down? It seems really quite expensive to do it and will I benefit that much from it? I need 30m in total... Where is the best and cheapest place to get it? The house is just over 100 years old so under the floor is not massively well insulated. The pipes are the plastic type not copper. What are your thoughts? Thanks