Flush-fitting plastic windows?

Hello everyone,

we have two companies here making the following statements:

Company 1:
Flush (outside) closing plastic windows are possible without further ado.

Company 2:
Flush (outside) closing plastic windows carry the risk of warping because they have an unfavorable "geometry." Company 2 therefore only makes these in the very expensive wood-aluminum version, which is not an option for us due to cost reasons.


How do you assess the statements of both companies? Does the risk mentioned by Company 2 really exist, or is it just a "trick" to keep the effort low for the company or to generate more money?

Flush-mounted windows would ultimately be the ultimate for us because this type of window very positively supports the appearance of our facade (very clear facade design towards Bauhaus style!).

Depends on the color of the windows? In the past, various problems have been heard with very dark shades (warping....) Of course, it is possible that the manufacturers have learned from this and/or one of the two window makers has already burned their fingers :-) What exterior color do the desired windows have?

Flush-mounted windows would ultimately be the ultimate because this type of window very positively supports the appearance of our facades (a very clear facade structure towards Bauhaus style!).

Then aluminum belongs there instead of plastic. In that case, the flush mounting is no longer a special request, and the slight "additional cost" (which in the long term is no cost at all) is further relativized.