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OK, I don't think that I actually answered your question properly. A small amount of moisture will seep in between the ceramic tiles during sustained heavy rain, but it is a very minor issue. I set a mini-wall of ceramic tiles standing up on their sides around the base of all the walls, and then grass grew thickly up against the vertical tiles, so the base is almost water proof; unless of course the observatory is located on the site with very poor drainage!
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