You measure the width and height with a tape measure or laser measure and check the deviations.

 

Deviations* for:

Brick walls:

openings up to 100cm: width +6mm and -3mm; height +15mm and -10mm

openings over 100cm: width +10mm and -5mm; height +15mm and -10mm

 

reinforced concrete walls:

- openings +25mm and -25mm

 

 

*deviation means the allowable difference between the designed and actual dimensions.

 

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