Plumbing insulation - or lagging - performs two important purposes: it prevents pipes from freezing and bursting in cold weather and reduces heat loss as hot water moves through the system. The four main types of insulation used in plumbing are explained below.
This is the most common form of pipe insulation and is made up of lengths of plastic foam tubing split down one side. By carefully opening the plastic foam tube at the split it can be eased on to the pipe, securing it in place at regular intervals with adhesive tape. Plastic foam tubes are manufactured to fit 15mm, 22mm and 28mm pipes and with a choice of two wall thicknesses. The standard thickness will be sufficient for most pipe systems, but if you live in a location where the weather is particularly cold, or the pipes are exposed, then the thicker grade should be used. Although plastic foam tubing is a little more expensive than self-adhesive foam wrap, it is easier to use.