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Get the installers back to do a proper job!
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Failing that, grind that out, back fill the gap (backing rod / expanding foam etc) then apply a good quality external
sealant (from soudal etc) -
With what you've said in the first post the priority would be to get the closures of the doors working as smooth as possible, estimating what'll fix this is a bit of a nightmare from a poorly fitted seal to complete frame misalignment, without that sorted the possible 3-5mm movement I'm operating the doors will never be sealed from the frame... But with it sorted the falling out may stop. A helpful judgement is how are the 'gaps'/cracking on the internal?
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Sadly as others have already said, you probably need to take the cement out and seal it with an appropriate frame sealant.
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Howard
bluehuw
Airhead
@frankohara
How shall I re-seal the frame of that alu bifold door to avoid water sneaking in above the damp proof membrane? Installers just used some concrete or concrete based render but being quite rigid it cracks and falls with door use (door catches more than I would like it) Shall I just add some external sealant? Any suggestions @Airhead
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