PPR (Polypropylene Random Copolymer) pipes are generally used for hot and cold water distribution in residential and commercial buildings. PPR pipes have a low thermal conductivity, which means they are good at retaining heat, but they can also cause heat loss if not properly insulated.
Whether or not PPR pipes need insulation depends on the specific application and conditions in which they are used. In general, if the PPR pipes are being used to transport hot water, then insulation is recommended to prevent heat loss and increase energy efficiency. Insulation can also help to reduce the risk of condensation forming on the outside of the pipes, which can lead to moisture damage or mold growth.
If the PPR pipes are being used for cold water distribution, insulation may not be necessary, but it could still provide some benefits. Insulating cold water pipes can help to prevent condensation from forming on the outside of the pipes, which can be especially important in humid environments.