Composite door "shudder"

[DIY fan]

No amount of extra fixings will make a difference (assuming he has done the recommended 600mm fixing spacing when joining the frames).
This is due to the flex in the 3 separate frames and the aluminum couplers.

I have the exact same problem

Front Door with two narrow side panels in glass. The door is fitted properly and strapped at 5 points overhead but there is still a shake

I have not rendered the outer reveal overhead yet, so I presume I will need something like this, which is strong but flexible enough to prevent cracking?

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I will also need mesh I presume

This would create a solid front for the doorframe to press against. On the inside, I may consider angle iron fixed up to the lintel across the width of the frame. This should prevent any play or movement?

 

[robinbanks]

What problem does it cause? Does the wind shake it audibly or is it just the few times a day the door is used you notice a flexing?

 

[DIY fan]

What problem does it cause? Does the wind shake it audibly or is it just the few times a day the door is used you notice a flexing?

When the door slams it shudders at the point where the side panel is connected to the door frame.

My concern is that over time when the outside reveal is plastered, that (a) the external plaster will crack with the constant vibration and (b) the vibration will also crack the hardwall inside.