Composite Doors: A Comprehensive Guide to Common Issues and Their Solutions

Composite doors have become an increasingly popular choice for homes and businesses due to their durability, security, energy efficiency, and visual appeal. However, as with any product, they can develop issues over time that require maintenance or repairs. This article from Be-Tech Locks provides a comprehensive overview of the most common composite door problems and proven solutions.

Be-Tech Locks is the leading hotel door lock system supplier in China, providing electronic security solutions like RFID hotel locks and biometric fingerprint door locks to facilities globally. With expertise in advanced access control systems, Be-Tech helps clients address issues promptly to extend product lifespans.

What are composite doors?

Composite doors consist of a PVC-U frame and door leaf made using various materials layered together under intense heat and pressure. The core is commonly filled with materials like woodinsulation, or reinforced uPVC for stability. This solid, dense composition results in exceptional thermal and acoustic insulation.

The outer surface utilizes a glass-reinforced plastic (GRP) skin that resists denting and repels water. Composite doors can replicate wood grains or various colors for customizable aesthetics aligned with a property’s style.

When properly manufactured and installed, composite doors provide heightened protection, efficiency, and visual appeal over traditional wooden doors. However, they still require proper maintenance and repairs when issues emerge.

Common Composite Door Problems

Despite their durable construction, composite doors can develop a range of issues over years of use, including:


The intense temperature fluctuations that exterior doors endure cause expansion and contraction of the composite materials, potentially resulting in the door warping or bowing. This leads to the door failing to close or lock properly, enabling drafts and security issues.


While composite doors offer exceptional resistance to weathering, constant exposure to sunlight and rain still degrades the vibrant coloring over time. This fading detracts from the door’s aesthetic appeal.


Similar to warping, continual expansion and contraction of the composite materials due to temperature changes can cause slight gaps to form. This enables annoying drafts and difficulties smoothly opening and closing the door.

Insulation Issues

Gaps that emerge between the door’s components, or the use of ineffective insulating materials in the core filler, lead to a loss of energy efficiency. This allows indoor heat to escape and cold external air to penetrate.


The intense pressure that extreme hot and cold weather exerts on exterior doors can cause cracking within the composite door’s frame or panels. This damage severely compromises the structural integrity and protective abilities.


Warping or expansion issues can lead to the door sticking and failing to open smoothly. Alternatively, the door may become misaligned within the frame, binding against the edges when operated.

Locking Issues

The same causes of warping and expansion that affect the door’s alignment can similarly impact the locking mechanisms. This leads to issues with the multipoint locks engaging properly to secure the door.

Glass Damage

Despite being tougher than standard glass, the glass panels within composite doors can become damaged by significant impact or extreme temperature fluctuations. Cracks compromise insulation, security, and visibility.

Water Leakage

Improperly sealed frames or damage around glass panels enables water ingress during storms. This can cause internal swelling, corrosion, and deterioration of the door over time.


The slight gaps that gradually emerge can lead to a noticeable loss of sound insulation. This allows external noise to penetrate disruptively into interior spaces.

Solutions for Composite Door Issues

While minor maintenance and adjustments can temporarily resolve some composite door problems, most require replacement parts or professional repairs for lasting performance.

Replace Affected Components

Instead of replacing the entire door, homeowners can opt to replace isolated components that become damaged or defective over time.

  • Panels: Swap out individual panels that crack, warp, or fade.
  • Locks: Upgrade loose or sticking lock mechanisms.
  • Seals: Replace worn weather seals around the door’s perimeter.

Adjust Door Hinges

Loosening and adjusting door hinges may help realign a warped door within the frame to operate smoothly again. This can enable a proper locking function.

Apply Weatherstripping/Caulking

Injecting weatherstripping into gaps or caulking around glass panels seals drafts and water penetration points. However, alignment issues will still require corrections.

Lubricate and Adjust Locks

Lubricating sticking lock components and recalibrating their alignment often restores smooth locking operation.

Refresh Appearance

For discoloration issues, plastic restorersspecialized paints, or wood stains can renew a composite door’s aesthetic appeal.

Ensure Proper installation and maintenance.

Many issues arise from improper initial door installation or a lack of routine maintenance. Ensuring professional care from the outset prevents premature problems.

Address the underlying causes

While the solutions above resolve symptoms, homeowners must also address root causes like direct sunlight exposure or inadequate overhang coverage to prevent repeat damage.

Preventative Maintenance for Composite Doors

Taking preventative measures maximizes the longevity and performance of your property’s composite doors.

Allow Room for Expansion

During initial installation, ensure the door frame allows adequate space for slight material expansion without binding.

Engage All Locks Properly

When closing the door, double check that both the top and bottom multipoint locks fully engage to seal weatherstripping and prevent movement.

Apply Protective Coatings

UV-resistant coatings and wood preservatives shield the door’s exterior from sun exposure and moisture damage.

Check or replace seals regularly.

Inspect weatherstripping seals around the door for deterioration annually, replacing any loose sections to maintain insulation.

Clean and Lubricate Hardware

Wipe down locking hardware and apply lubricant spray twice annually to prevent sticking and corrosion issues.

With proper installation, care, and maintenance, your property’s composite doors should provide decades of unmatched protection, efficiency, and visual appeal. But despite the most diligent preventative measures, issues still arise. Implementing the comprehensive solutions outlined in this guide from the experts at Be-Tech Locks helps maximize composite door performance, lifespans, and return on investment.

For additional information or assistance with your facility’s door security and access control systems, please contact Be-Tech Locks via our website or phone at +86-757-28376123.

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