Glass holes

The diameter of the hole that is made into the glass has to be 5 mm minimum, or, as is the case with the thickest glazings, the same as the thickness of the glass. The diameter of a round hole can not exceed ⅓ of the thinnest point of the glass.

The distance between the edge and a hole with a diameter under 50 mm has to be at least 1.5 times the thickness of the glass. If the glass is 8 mm or thicker, the distance has to be at least two times wider.

The hole’s distance from the corner of the glass has to be at least 4 times the thickness of the glass. If the hole’s diameter is over 50 mm, or if it is rectangular, the distance has to be at least 0.5 times the hole’s diameter or width.

The maximum width of a rectangular hole can be ⅓ of the width of the glass, and the maximum height of the hole ⅓ of the height of the glass. The edges of holes always have to be bull-nose. The corner drilling of a rectangular hole has to be at least the same as the thickness of the glass, yet at least 10 mm.

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