Best Mullions for Double Doors: Tough, Weatherproof Solutions You Can Trust
Double doors rely on precise hardware to seal, operate smoothly, and resist the elements. This guide covers top mullions and related sealing solutions that fit common double-door setups, from aluminum astragals to vinyl weatherstrips. Each option aims to improve security, insulation, and daily usability while fitting typical interior and exterior styles across American homes and businesses.
Below is a quick reference of featured products, highlighting what they’re best for and where they excel. The table includes the product name, brand when available, a quick-use note, and the primary benefit for double-door installations.
| Product | Brand | Core Benefit |
|---|---|---|
| CRL Double Door Overlapping Strike DDS | CRL | Integral compatibility for metal and wood doors; key for rim panic exit devices on double doors |
| Double Door Mullion Horseshoe Astragal Seal | Window & Door | Weatherproof strip to seal gaps between double doors |
| Jackson Stabilizer Package for 896 Mullion | Laurence | Replacement stabilizers; four pieces for double-door repair |
| 2 Pcs 36″ Double Bubble Kerf Door Sweep | — | Vinyl weatherstrip for exterior doors; energy efficiency and draft protection |
| Aluminum T Astragal for Double Doors | — | Sound insulation, wind and dust protection, heat retention for double doors |
When choosing the right mullion or seal, consider door material, opening direction, climate, and whether you need retrofit components or new installations. The items listed here cover metal and wood doors, interior and exterior use, and both permanent installations and repair kits.
CRL Double Door Overlapping Strike DDS
CRL’s Double Door Overlapping Strike DDS is designed for use with both metal and wood doors and is commonly paired with rim panic exit devices when two doors operate together. This hardware supports secure latching, improving the overall efficiency of dual-door assemblies in commercial and residential settings. Its compatibility with multiple door types makes it a versatile choice for retrofit projects or new installations where a dependable strike mechanism is essential.
Double Door Mullion Horseshoe Astragal Seal
This weatherproof door seal strip from Window & Door functions as a horseshoe astragal for double doors, helping to block drafts, dust, and moisture. It’s a practical upgrade for older doors with noticeable gaps along the meeting stile. The installation improves thermal performance and reduces noise transfer, which is particularly helpful in busy entryways or exterior-facing doors exposed to the elements.
Jackson Stabilizer Package for 896 Mullion
The Stabilizer Package from Jackson, marketed under Laurence, provides four pieces to repair a double-door installation. This kit is ideal for restoring alignment and maintaining smooth operation when a mullion or door assembly has shifted or worn over time. It supports both residential and light commercial double-door configurations and helps extend the life of existing hardware.
2 Pcs 36″ Double Bubble Kerf Door Sweep
These dual-pack kerf door sweeps are designed for exterior doors and help seal gaps along the bottom edge. Made of durable PVC, the 36-inch length and 1.75-inch width fit a broad range of door sizes. The package is cost-effective for outfitting multiple entry points, and the brown finish blends with many door colors. They are a practical choice for reducing drafts, dust, and noise while supporting energy efficiency.
Aluminum T Astragal for Double Doors
The Aluminum T Astragal is designed for both inward and outward opening double doors, suitable for commercial and residential use. It emphasizes sound insulation, windproofing, dust protection, and heat preservation. The product features a 36-inch length, 0.5-inch width profile, and adjustable sealing gaps, making it adaptable to various door-threshold configurations while enhancing comfort and energy performance in exposed entryways.
Buying Guide
Key considerations when selecting mullions, astragals, and door seals:
- Door type and opening direction: Choose components compatible with the material (metal, wood, composite) and whether doors swing inward or outward.
- Climate and weather resistance: For exposed entrances, prioritize weatherproof seals, UV-stable materials, and rust-resistant finishes like aluminum or bronze.
- Sealing and insulation: Assess gaps at door meets, thresholds, and along the mullion. Astragal seals, kerf sweeps, and overlaps reduce drafts and improve energy efficiency.
- Repair vs. retrofit: If the mullion or stabilizers are worn, consider replacement parts that restore alignment and security without a full door replacement.
- Aesthetics and finish: Match finishes to door hardware and frame for a cohesive look, especially for visible exterior doors.
- Installation complexity: Some products require basic hardware skills; others may benefit from professional installation for optimal alignment and performance.
When evaluating options for double-door assemblies, it’s helpful to compare durability, installation ease, and compatibility with existing hardware. For historic or high-use entrances, prioritize products with robust materials and proven performance. For budget-conscious projects, consider a combination of weatherproof seals and stabilizers that restore function while delivering measurable energy savings.