I am looking at getting brown uPVC doors for front and back door. I was told by an installer that a brown outside door, with the inside part white would not expand with heat. But there is always a possibility that a door which is brown on both sides can sometimes expand when hot. Was told that it is possible that door may not shut, once opened. I have dealt with this company before and I trust the guy but I have never heard of this before. Can anyone shed any light on it. Thanks