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Give a picture, maybe a structural crack. This also depends on whether your balcony is supported by pillars or not. Take 3-4 clear photos to see, have the location of the cracks and the panorama, and have photos of the windows (corners) of the balcony.
The masonry did not pull the wall reinforcements, which is also the responsibility of the construction.
Sealants can. Or use special plastic glue. AB type. made of epoxy resin. This strength is high. Silicone sealants are not strong enough and are easy to tear.
Just put it on with sealant.
When the gap was first dealt with, it may not have been done well. >>>More
The most difficult is the butt without keel lining Aluminum-plastic panel edge, reverse folding thin edge strips, adding double layers, flat butt Two large plates fixed on the keel lining with gun nails squeezing the seam Gap opening with plastic "aircraft triangular expansion screw"! "Peer! "Whistle at the risk of death" click: Adopt!