Yes, when the louvres of our pergolas are fully closed, the roof is completely weatherproof in standard conditions. Rainwater runs from the roof louvres into a hidden gutter system and then drains down internally, through the legs. However, during severe weather conditions and heavy rain, there may be a slight leakage as excessive water cannot flow through the drainage quickly enough and may spill over, similar to guttering on a home or an external drain.