The cork matting worked, only....not in the way I expected. I was getting water in from the outside. The cork stained dark at the points the water was getting in. I drilled a hole in the foot of the Observatory at the points where the dark patches were, and squirted in some expanding polystyrene. A few hours later, I cut off the residue with a sharp knife. Problem is now solved. I will leave the cork matting in place. It provides a little insulation from the concrete pad. Besides, if I get a new leak, I can see where it is entering the observatory immediately. A little expanding polystyrene will sort that out too.
Clear skies.
Wayne

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