When constructing an internal wall, it is necessary to consider the amount deflection (dynamic lateral movement) that will be present in the structure.
This allows the core structure to move without producing stress cracks in the lining board joints.
When it comes to an internal doorway, the deflection requirements of the jamb studs are no different to the rest of the wall: the jamb studs must not be direct fixed to the top track. Installers often overlook this point and simply screw the jamb studs to ensure a rigid connection for fixing the jamb stiles. Structure deflection does not magically disappear at a doorway. In some recent projects where jamb studs were direct fixed, cracking occurred almost instantly and irritating noise was produced by the friction created by the screwed joint. Needless to say, on a fully occupied 30 storey apartment block, rectification works were difficult and costly.
The correct method for fixing jamb studs in deflection situations is to use Studco M100 angle bracket. The bracket is fixed through the top track using a masonry anchor, providing a rigid and sturdy fixing point. Then, by screwing through the two slots provided on the bracket to the pan of the stud, the stud is held firmly in place, with no axial or longitudinal movement but with the ability to ‘float’ as the core structure deflects. Do not fully tighten the screws, to allow the stud to slide, and ensure that jamb studs are always boxed.
Do it right, do it once. Using the correct method only takes marginally longer to install and it’ll save you a heap when you don’t get called back for defects.