My front porch is in good structural condition, but over the years the 1x6 boards were stained, then painted. Of couse, the paint is peeling badly. Rather than going thru the pain of stripping/sanding/painting, or removing them entirely (they are nailed, not screwed) can I put another layer of 1x6 cedar directly on top? The current height is 7" above the last step. Do the boards need to be gapped? Should there be a layer of waterproofing between?