What are the advantages of sliding folding patio doors, you ask? In many cases, people who have sliding folding patio doors found that they experience a sort of outside inside living. Having that said, these sliding folding patio doors can be folded right back to allow the best in inside/outside living. It provides a certain amount of light indoors during the day which can be quite an energy saver, if you ask me. Unlike conventional sliding doors, which only open up halfway through the space available, these sliding folding patio doors (or bi folding doors) can fold right back to just a few inches of the opening. In other words, your house will look and feel spacious more than ever. Another great advantage of sliding folding patio doors is that they are quite easy to install. Bi folding doors can simply be carried through the house to the site of installation with no mess and no fuss at all.