Kelleway v Insar [pdf, 283 KB]
...chosen to avoid detracting from the appearance. Control joints can also accommodate thermal stresses…. The sensible provision of control joints is good insurance against uncontrolled unsightly cracking… Vertical control joints should be formed above and below the sides of openings such as doors and windows and at 4.0m intervals. In some parts of the country where the temperature range from summer to winter is large, plasterers form joints at 2.5m spacings between openi...