Does spacing roof slates introduce a weather-entry problem?

No. The 1.2 mm ( Over the centuries, standard overlaps have been well worked out to accommodate these openings. Because it reduces capillary action, SlateSpacerâ„¢ actually reduces the most persistent form of water penetration.

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I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.