what is the unit of measuring glass panes?
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Answer:
Fitting a new sheet of glass into an existing window frame depends largely on cutting the glass to exactly the right size: too large and it won't fit, too small and it won't fill the hole. The space where the glass must fit is larger than the hole you see, so simply measuring across that hole won't work. You also must determine the dimensions of the recess into which the glass fits, a dimension known as the "tight fit."
1
Locate the outer edges of the glazing beading all around the frame. Glazing beading is the strips of wood or plastic that overlap the edges of the glass and hold it in the window frame.
2
Determine the horizontal "tight fit" dimensions by measuring the horizontal distance between the two outer edges of the beading on either side of the window frame at the top and bottom of the frame. Record the dimensions as the top and bottom "tight-fit" values.
3
Determine the vertical "tight fit" dimensions by measuring the vertical distances between the top and bottom outer edges of the beading on the left and right edges of the frame. Again record the dimensions.
4
Deduct 1/4 inch from each of the recorded dimensions. For example, if the width across the top of the frame is 30 inches, deduct 1/4 inch to create a new width of 29 3/4 inches. The adjusted measurements are the values to use for cutting the new sheet of glass. A 1/8 inch is deducted from each side of every dimension so that the cut glass is slightly smaller than the frame. This allows the frame to contract and expand without compressing and fracturing the glass. Because 1/8 of an inch is removed from each side, the total removed is 1/4
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