Bed joint reinforcement may be used for a variety of purposes and locations:
In walls which have door and window openings, bed joint reinforcement can reduce the frequency of control joints. Reinforcement should be provided in the first and second courses above and below all openings and should extend no less than 600mm either side of the opening.
Bed joint reinforcement can also be used near the top of the structural walls abutting concrete roofs and to provide additional strength to parapet walls.
If you are looking to use it on the external wall we strongly advise that you use stainless steel, however the internal wall can be either stainless steel or galvanised.