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The addendum is intended to complement the Moisture Performance of High-R Wall Systems report. This Addendum summarizes the results of extended monitoring that continued through April of 2018. The goal of the extended monitoring is to capture the performance through an additional winter season, after the construction moisture had an opportunity to dissipate, so that the observed results are representative of expected long-term trends in wall performance. Monitoring through an additional year also provides data for a different set of climatic and indoor conditions.