What Is an Astragal and Why It Matters for Your Doors
Quick Answer: An astragal is a vertical strip, often made of wood, metal, or composite, that attaches to one of the doors in a double door system. It seals the gap between the two doors, improves security, and enhances energy efficiency.
If you have ever shopped for double entry doors or French doors, you may have heard the word astragal.
It sounds complicated, but it is simply a small yet critical piece of hardware that improves how your doors function and seal.
For South Florida homeowners, where hurricanes and heavy rain are constant threats, knowing what an astragal does can make the difference between a secure, efficient door and one that fails when it matters most.
What Is an Astragal?
An astragal is a component used primarily on double doors and French doors. It runs the full length of one door and overlaps the other, ensuring that the space between them is closed.
Without it, you would see daylight and feel drafts where the two doors meet.
Astragals may include weatherstripping, locks, or bolts that extend into the floor and frame for extra reinforcement.
This makes them especially valuable for
impact doors in Miami and across South Florida.
Key Factors Affecting Astragal Performance
- Material: Wood astragals are traditional, while aluminum and composite astragals are more durable in humid climates.
- Weather Resistance: Many models include integrated weatherstripping to block air and water leaks.
- Security: Astragals often include flush bolts that lock the inactive door into the frame and threshold, improving resistance against forced entry.
- Cost Range: A basic astragal can cost around $50–$100, while high-performance versions with multi-point locks may exceed $250.
- Installation: Proper alignment is critical. Poorly installed astragals can compromise storm resistance and void warranties.
Local Relevance for Florida and Miami Homeowners
In South Florida, building codes are strict because of hurricane risks. Miami-Dade County requires door systems, including astragals, to meet impact resistance standards.
An improperly sealed double door can allow water intrusion, air pressure changes, and even structural failure during a storm.
Insurance companies also look at door hardware. A French door astragal that locks securely can reduce claims risk, which may help homeowners qualify for insurance discounts.
For Miami residents, ensuring your astragal meets
HVHZ (High Velocity Hurricane Zone) standards is just as important as choosing impact-rated glass.
Comparisons or Alternatives
- Single Door with Sidelites: A common alternative to double doors. Eliminates the need for an astragal but reduces the opening width.
- T-Astragal vs. Flush Astragal: A T-astragal overlaps the inactive door, while a flush version aligns evenly. Flush astragals provide a sleeker look but may reduce weather resistance.
- Surface Bolts Only: Some homeowners skip astragals and use surface bolts, but this sacrifices energy efficiency and storm protection.
Actionable Tips for Homeowners
- Always check if your double door system includes a factory-installed astragal.
- Make sure it is impact-rated for Miami-Dade compliance.
- Inspect weatherstripping regularly to prevent air leaks.
- Choose materials resistant to rust and warping in humid conditions.
- Upgrade to a reinforced astragal with multi-point locking if security is a priority.
Why Choose Doors Galour Corp?
At Doors Galour, we specialize in custom impact doors built for South Florida conditions.
Our double entry and French doors come equipped with astragals designed to meet or exceed Miami-Dade and Florida Building Code requirements.
Whether you are exploring
impact doors or upgrading your
custom interior doors, our team ensures every detail, including astragals, supports durability, safety, and energy savings.
Why Astragals Matter for Your Doors
An astragal may be small, but it is a key factor in how well your double doors perform in Florida’s demanding climate.
From keeping out water and wind to reinforcing security, this strip is essential.
If you are considering new entry doors or want to confirm your current doors meet hurricane standards, we at Doors Galour can help.
Start your project today by
requesting a free quote.
FAQs
What is a door astragal?
An astragal is a vertical strip attached to one door in a double door system, sealing the gap between doors.
What is an astragal on a French door?
It is the same concept, used to connect and seal French doors, often with added weatherstripping and locks.
Is an astragal necessary?
Yes. Without it, double doors are vulnerable to drafts, leaks, and break-ins.
What is the difference between a T-astragal and a double door astragal?
A T-astragal overlaps the inactive door, while a double door astragal may be flush, creating a more seamless appearance.
Can I replace an astragal myself?
Yes, but professional installation is recommended to maintain storm resistance and warranty coverage.
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