We had T&D Screen Enclosures install our sliding glass doors. We had heavy duty, vinyl, argon filled, doors put in. T&D was the best in my opinion. They level the lanai floor so you don't step down into your lanai. They set the doors in a special slot in the cement so they don't rely on caulking to waterproof. They don't use a bead of cement to level the doors on the sides as some other companies do. Over time this wedge of cement can break down, especially with the installation of heavy sliding doors. In addition they need to rely on a thick bead of caulk to waterproof under the doors and this is prone to breaking down over the years and then it leaks. Not fun if you have nice furniture or a finished floor on the lanai. By leveling the floor with additional cement you can also put electrical outlets on the outside columns. T&D did an outstanding job for us.
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