I am a licensed contractor who installed a Marvin french door for a customer.The door itself cost $1900 plus finishing and installation.
The door was warped 1/8 " from top to bottom causing the door to not seal at the top. We spent a great deal of extra time trying to tweak the installation to accomadate this issue but could not remedy it completely Marvin sent out a tech who told us that the allowable tolerance for warping is 1/4 ". The weatherstripping is only thick enough for a variance of 1/16" at most.
No help from Marvin and I have a pissed customer.I used to tell clients that Marvin was the best but never again. 2f960c2