What a great guy! The original install of our French doors was done so badly, when it rained outside, it came inside through them. We thought they were installed backwards but Derrick figured out that our leaking French Doors could be repaired by properly adjusting the doors, weatherproofing, and putting on a drip guard above the door opening. Hooray! It is watertight, shuts perfectly, and I'm very happy with the completed work. The price was very fair for his high level of expertise.