嗨。附近的一个矩形块石板掉到地上我的后花园。我不知道这是从哪里来的,屋顶没有将瓷砖。我想知道它来自下忽明忽暗的?它有两个孔两端。不确定这是钉子或螺丝?任何建议大大赞赏

课程”可以作为一个屋檐下瓷砖的第一行吗?
没有看到图片(我猜你有普通瓷砖10 x6 ?)”Ah ok, this might be it! Its a Victorian house, Roof has red concrete tiles but they might not have removed the original slate from the eaves? Was it there to prevent damp?

“通常会有一个屋檐瓦带雨水沟,有时石板被使用,做同样的工作,但也许成本有效的方式如果石板盖屋顶坏了一半使用?”Must be it. It was a quarter size of the concrete tiles. The must have cut some of the original slate tiles down to size to do this. Mystery solved!