Sliding Screen Doors are  often used  as Patio Doors.

Sliding Doors have the advantage that they do not require room either insider or outside to allow them to be opened as hinged patio doors do.

There is however a problem , and you need to check on the doors that you buy for security. If the doors are simply on two sliding rails, then at the center is a potential weak spot where they can be levered apart.

For that reason tilt and slide doors are a more complicated patio door, where the inner door slides across then a mechanism drops it outwards and level with the other door – although the tilt and slide patio doors seem to be less common, since they are certainly more expensive, and there is more to go wrong with them.

There are Sliding Screen Doors of all sizes, weights, colors and materials, so they are available in wood, PVC and aluminium.

Aluminium sliding doors may be weaker than UPVC, since aluminium is not a strong material unless reinforced.

Wood screen doors look more natural.

There are a variety of manufacturers and Retailers in the Internet – so here are sites where you can find  Sliding Screen Doors

Sliding Door Co. – Website has both Wall Slide Doors and Swing Doors

Other sites and resources are:

ScreensDepot.com – Offers Screen Kits for Sliding Patio Doors

Wizard Industries -  Has  Retractable Screen Doors

As with all patio doors, check out how the manufacturer has tackled  the security issues with sliding screen doors.  Several risks are – first that the entire frame is pulled out, next that the two doors are levered apart.  Finally that the glass can be either broken or removed.