Beware of imitations- log cabins which use less costly styrene plastic Home windows (which tend to ‘mist’ or shatter simply eventually). All Tiger log cabins have 4mm thick toughened glass as regular. The nail is pushed in on an angle to safe it in place, but doesn't fully go in. https://cornersummerhouse36789.blogdomago.com/27222108/considerations-to-know-about-timber-summer-house