Arguably, French doors could be considered as retractable as each door can be pulled back. The advantage of retractable doors is that maximum access is possible between the two sides of the aperture whereas sliding panel doors generally overlap unless built to retract into a recess.
Metal frames, usually aluminium, provide strength in compact form. As notoriously good conductors (which is a bad attribute for insulation), frames made from aluminium are thermally-broken, which is a good attribute. It means that the metals on the inside and outside of the door frames are not joined, preventing the temperatures from being transferred between them. A bare metal frame would look completely unattractive so it is powder-coated in a choice of over 100 standard colours, including a white that resembles pvc.
Modern patio doors can be made out of materials such as aluminum and PVC vinyl. While those materials have their merit, they simply cant match the warmth and beauty of wooden doors. When you choose wood for your patio door, youre not stuck with one color. Those other doors are usually all white, but what if you want a color that goes nicely with the inside of your home? Well, as you know, wood comes in all sorts of color and grain choices, so there are no limits to your decorating choices.
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