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    This. Tonnes of places water gets in and then busts it apart. Water in a hole in a stone can break it apart given a few freeze/thaw cycles, so it will split apart a felted roof in no time. Generally easy to fix so long as access isn't a chore.

  • This is what I thought about the burst water main up in Belsize Park - it's going to be a nightmare if your basement floods then freezes.

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