Ok, thinking about putting a sink in my garage for cleaning muddy boots etc. One thing which I am worried about though is the pumbing freezing in extreme cold conditions like that expirienced in dec 2010 and flooding the garage. What is the normal practice for installing plumbing in unheated buildings? I know insulation will help but if the temp is below 0 and the tap not used for an extended length of time will it still freeze despite being insulated? What type of pipe is best? Copper, Speedfit or Is it possible to buy pipe which can cope with expansion without breaking?