 | Carpentry for Vocational Schools - A Teachers Handbook |
 |  | 20. DOORS |
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20.2. Calculating of opening
To calculate the width of the door opening , measure the width of the door, add two jambs thickness and 4 mm. To calculate the height of the opening, measure the height of the door, add head and 4 mm.
E.g. Width:
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Doorwidth |
820 nun |
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Thickness of 2 jambs |
+ 50 nun |
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+ 4 mm |
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________ |
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Width of opening in the wall |
= 874 mm |
Height:
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Doorheight |
2040 mm |
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Thickness of one head |
+ 25 mm |
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+ 4 mm |
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_________ |
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Height of opening in the wall |
= 2069 mm |
Door opening in the wall = 874 x 2069
Figure
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