Who knew there was a “right” way to configure my hated aluminum triple track storm windows? I had assumed that both of the glass storm sashes had weatherstripping on the sash to allow them to be positioned with either sash as the bottom or top.
It looks like only the “inside” sash can be the bottom. I gained this bit of enlightenment during this past weekend’s snowstorm when I noticed snow piling up in the window sill space between the storm windows and the interior windows in the sunroom.
I scooped out the snow, reversed the storm sashes and haven’t had any more issues. Yes, dear reader, I feel like a dummy. So that you won’t repeat my mistake, remember to position your storm window sashes just like those on your main windows– with the sash closest to the interior of the house on the bottom.
Or do what I hope to do someday and replace your aluminum storm windows with new or salvaged wooden ones.