I had a tap fitted outside over the summer. It is fed from a tee off the rising main under the kitchen sink and then through the wall and fitted under the kitchen window. I can turn off the supply via a dedicated stop cock. My neighbour reckons that his didn't freeze even during last year's cold snap and that he has never bothered to insulate it. I have switched off the water supply, but is my neighbour correct about insulation? The house is centrally heated until about 10.30 each night and then again from 6am.