DuraTop Quick Facts Sheet) In 2011, the Oregon State University Utility Pole Research Cooperative published their 31st Annual Report. In that report, they shared their findings on the benefits of using caps on wooden poles. For 40 months, the wood moisture contents of Douglas Fir pole sections were studied to determine the effect of capping. "Moisture levels in capped poles have continued to remain at low levels after 40 months. The levels are within the expected equilibrium moisture content for wood exposed outdoors and far below those required for active fungal decay." - Read the full report. Installing the DuraTop-50 Pole Cap is simple. It won't tear, and it won't stick to itself or to other caps in the box.