2 patio doors were installed by their contractors in 2008. I live off a lake with a lot of wind, doors are drafty. If doors are raised up air leaks through bottom. if door is lowered air leaks out of top. Installing contractor came out twice to fix problem and finally stated nothing else can be done. I had to install plastic to keep draft out. I guess my research wasn't as good as I thought. I called and wrote to customer service. no reply. I'll need to find better doors.