The basic problem with the majority of thermal pipe insulation products is that you cannot use them outdoors; notable exceptions are premium products such as Eurobatex R which can be used externally without painting due to its protective polyolefin skin, but comes at a price premium compared to other products, or high temperature EPDM rubbers such as Eurobatex AT which are inherently UV stable but lacks the thermal values to be used for frost protection on smaller pipes (this product is intended mainly for use on solar pipework where the thermal requirements differ from conventional thermal insulation products).
So, how do you protect it if you want to use this kind of product outdoors? The thing to use is a product such as Plysolene PIB (Polyisobutylene) Sheet. This is a strong but flexible jacketing product that can be used over a variety of insulation types. It is applied by using a welding agent to bond all overlaps and butt joints, going around the insulation 1m at a time. The material is supplied 1m wide, so this is achieved by cutting off the required length to go once around the pipe plus 50mm to overlap at the seam. This is then secured with welding agent. You should also allow an 80mm overlap for the butt joint. For more installation information you can visit Plysolene's Website Here: http://www.plysolene.com/pib-application-advice.asp
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