Double doors can elevate curb appeal and create a distinctive look that makes an entryway stand out from a traditional single entry door. However, creating a complete double door system involves more than simply selecting two door slabs. From choosing the right configuration and hardware to protecting the area beneath the threshold, several important details can impact the performance and longevity of the finished system. Here are four details to get right before you order.

Understanding the Door Configuration

One of the most common points of confusion when ordering is understanding the difference between a patio door and a double door system. While the two may appear similar, they operate differently. With a patio door system, one panel typically remains fixed while the other operates. With a double door system, both door slabs are designed to operate, allowing for a wider opening when needed. Understanding this distinction is an important first step in selecting the right configuration for your project.

The Importance of an Astragal

Once the door configuration is selected, the next consideration is how the two slabs will work together. An astragal plays an important role by securing the inactive door panel and helping keep both doors properly aligned within the frame. This added stability can help prevent shifting or bowing while also contributing to improved security and weather resistance.

For an easy-to-use option, consider the Ultimate Flip Lever™ Astragal from Endura, designed for use with Panolock. Unlike traditional astragals that may require the homeowner to bend down to lock or unlock the inactive door, the built-in Flip Lever allows the astragal to be operated with one simple motion for added convenience and accessibility. The astragal boot also lifts clear of the sill when the inactive door is opened, helping reduce the rubbing, wear and potential damage that can occur with other astragal designs.

Choosing the Right Locking Hardware

Hardware is another important part of configuring a double door system. For double fiberglass doors, consider the Therma-Tru® Multi-Point Locking System (MPLS), which engages the door and frame at three points from top to bottom rather than at a single point like a traditional deadbolt. The increased engagement helps enhance stability and security while helping create a more complete door system. For double-door applications, Therma-Tru and our team highly recommend the Lever-Style MPLS. The system engages by lifting the handle upward, activating the locking points along the door edge. Once engaged, the door secures at the top, middle, and bottom, while the deadbolt provides an additional point of security below the handle. Designed with larger entry applications in mind, the Lever-Style MPLS is a strong choice for double fiberglass doors, combining enhanced security with intuitive operation.

Don’t Forget What’s Underneath

The performance of a double door system isn’t just about what you see. Protecting the area beneath the threshold can also help prevent moisture-related issues that may affect the system over time. Protecto Wrap Premium Dual Guard Threshold Tape™ is designed to help protect the subfloor beneath the threshold from air and moisture infiltration. Its unique flange creates a gasket-like seal around the threshold, helping keep moisture from reaching the subfloor.

By limiting moisture infiltration, the tape can help reduce the potential for subfloor swelling, warping and structural movement that could cause the door frame to shift out of square and require ongoing adjustments.

Putting the Complete System Together

A successful double door installation goes beyond selecting the right slabs. Paying attention to the door configuration, astragal, locking hardware and threshold protection can help create a complete system designed to perform reliably while providing homeowners with added security, accessibility and peace of mind.

Need help configuring a Therma-Tru double door? Contact our team. Your Palmer-Donavin Door Representative and our Door Customer Service team can help guide you through the details and ensure your unit is configured correctly before ordering.