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How to Repair a Cracked Composite Door

Even though composite doors are extremely robust but they are still susceptible to developing cracks due to wear and tear. Fortunately cracks like this are generally simple to repair.

All you need is an plastic filler, a uPVC-friendly cleansing agent (HG uPVC Powerful Cleaner is the best choice) and a medium to fine grit Sandpaper. First, you need to clean the crack.

Identifying the Crack

Composite doors are one of the most popular kinds of front doors that are available due to their style and durability. However, like any other door, they may be prone to problems over time. Luckily, most of problems can be solved without the need to call in professionals.

If you hear a loud cracking sound each when you shut or open your composite door it could mean that the frame is damaged. This is especially relevant if the crack is visible on the outside of the door frame. In this scenario it could be caused by the door and frame not fitting properly at the beginning. It is recommended to contact the professional installer who fitted your composite door, as they can help resolve this issue.

Incorrect alignment of hinges and latches is another issue that can be found in composite doors. This is often the result of excessive use or wear and tear, but it could also be caused by changes in temperature and humidity. This is a different issue that can be fixed by simply changing screws.

sittingbourne composite door lock replacements might also notice that the frame of your composite door isn't big enough. This could occur if the frame was not installed correctly by an experienced installer. If the frame is too small, it will not be capable of supporting the weight of the door. This can lead to cracking, warping, and creaking.

Another potential cause of cracks in a door made of composite is weather damage. The most common type of weather damage to composite doors is a worn out or missing weather seal. This allows cold air to enter your home, along with debris and rain. A broken or damaged weather seal can be fixed by replacing it with a new one that is made for composite doors.

The most important aspect of maintaining a composite door is the regular cleaning. This will prevent the door from getting damaged or scratched. it can also help to keep any stains from appearing. It is recommended to clean your composite door with soapy water at least once per week to avoid the pitting of your hardware. Also, you should regularly lubricate hinges.

Cleaning the Crack

Composite doors are a favorite among home owners because of their durability and low-maintenance feel. However, they are susceptible to a number of common problems over time, including cracks and warping. Most of these problems are solvable without the assistance of a professional.

A composite door is constructed of a solid wood core to provide strength and stability, and uPVC to weatherproof it against the elements. The door is then covered with a glass reinforced plastic (GRP) outer skin which is available in a range of styles and finishes including woodgrain effects and a smooth contemporary finishes. Composite doors are created by combining different materials that makes them highly robust, resistant to moisture, and resistant to abrasions.

The best way to ensure your composite door stays looking good is to keep it clean and dry. You can keep your composite door looking good by regularly cleaning it with a mild cleanser and a soft cloth. However, you must also wipe the door down after exposure to sun or rain. Avoid using abrasive cleaners as they could cause damage to the surface of the door. Also, always ensure that you make use of clean water to wash it off once you're done.

Another method to keep your composite door looking great is to lubricate the hinges and locks on a regular basis. It is recommended to use a lubricant specifically designed for uPVC locks and doors but be careful not to overdo it. A lot of grease could cause the lock to get stuck or stop working altogether.

One last thing you must do to maintain your composite door is to regularly examine the weather stripping to ensure that it's in good shape and working properly. This will help reduce drafts, and also save you money on your heating bill.

Although composite doors of today are durable and resistant to many common problems, they can still be damaged by sudden temperature changes or simply wear and wear and tear. Even the most severe cracks can be repaired by using some plastic filler, sandpaper and perhaps a little more sandpaper.

Filling the Crack

Although composite doors are extremely durable, they are prone to cracking because of physical damage, such as scratches or impacts, or even changes in humidity and temperature. These cracks can often be easily fixed with a simple DIY repair technique.

It is important to determine the cause of the crack. It may be as simple an ear-splitting sound that you hear when you shut or open the door. Alternatively, it could be more severe, like a visible crack or damage to the exterior glass panel. If the problem is more serious, you will need to seek help from a professional.

The next step is to apply an adhesive to the cracked area. You can buy plastic fillers that are specially made to be used on uPVC and composite materials. They are typically a mixture of liquid and powder, that must be mixed before being applied immediately as they harden very quickly. Use a putty blade to apply the filler, making sure you get it all the way to the other side.

Once the filler is applied, you'll need to sand it down to create smooth finish. For this, you can employ an electric sander, or a light sanding tool. After you've sanded your area, you will require a clear coat of varnish or polyurethane to protect the filler and your door.

If the sound of the hinges on your doors is making you hear a cracking noise You should grease the hinges to prevent them from falling down or becoming stiff over time. This will ensure the hinges' strength and extend their lifespan.

You can keep your composite door looking like new by regularly sanding, using touch-up pen to repair scratches, and applying a paint of the same color for uniformity. Regularly lubricating ensures that your composite door is as strong as possible. This is an easy step that can be overlooked, but can make all the difference to the functionality of your door and appearance.

Sanding the Crack

Composite doors are durable and strong however they may crack or creak. These issues are more likely to occur within the frame. This could be due to a variety of causes, including weathering or general wear and tear. If you're concerned that your composite doors are beginning to show signs of aging there are some easy steps you can follow to rectify the problem.

Clean up the crack and the surrounding area. This will prevent dirt from getting intermingled with the work to be repaired later. To remove any grime or grit, you can use a uPVC non-toxic cleaner that is fragrance-free like HG uPVC Powerful Cleaning Agent, available on Amazon. Leave the area to dry fully before proceeding.

After the crack has been cleaned and dried, you can begin the composite door crack repair. Depending on whether or not your door is painted, you can choose between filler and putty for this step. If it's painted, opt for a wood filler that can be sanded down after it's set. After you've applied the filler you prefer, let it set. Sanding down the compound will help smooth the surface and make it appear more natural.

You'll also need to consider the size of the crack before you start sanding. If the crack is bigger than the crack, you'll need more than just filler or putty to fix it. If your door is showing indications of this, you might need to put a wood spline in the split to provide a long-lasting solution.


The best way to stop splitting from occurring is to make sure the door frame and hinges are properly positioned. It is also crucial to regularly oil any moving parts, such as the hinges, by using products specifically designed for uPVC and composite materials. This will help reduce friction and ensure that your composite door is operating smoothly for many years.

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