How long can PVC pipe be left outside exposed and still be used?
At least 2 years. According to a UniBell study [1] PVC pipe retains its strength after being exposed for up to 2 years. This study found that after 2 years of exposure PVC pipe’s, – “…tensile elasticity and tensile strength…for all practical purposes unchanged.” – “…pressure class…remained constant.” – “…ability to resist external soil loads and traffic loads has not been adversely altered…” – “Reductions in pipe impact strength…were not significant enought to warrant concern.” In addition, exposed unburied ASTM certified gaskets are warranted by the manufacturer for up to 2 years.
