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How To Repair Rotted Window Sash In Reading

Are you experiencing rotting problems with your home's sash windows in Reading? This can be a frustrating experience, but it is not unusual. Sash windows provide excellent ventilation, but they tend to suffer from rot problems due to their construction using wood.

At Sash Windows Berkshire, we are sash window repair experts with a wealth of experience in repairing and replacing window sashes in Reading and the surrounding areas. Whether your sash windows are suffering from rotting, wear and tear, or any other issues, we can help.

Introduction to Sash Window Repair

Before we delve into the details of how to repair rotten window sashes, it is essential to understand the benefits of sash window repair over replacement. Some people may think that replacing a rotted window sash is the easiest option. However, repairing your sash windows has advantages that you may not have considered.

Replacing your sash windows entirely can be more expensive, and it may change the look and feel of your home. Repairing your window sashes preserves your home's original appearance while addressing the problem areas. Repairing is also more eco-friendly and sustainable than replacing the entire window. It ensures that the original timber is used, reducing the need for new materials.

Wood, Window and Screw

To repair a rotten window sash in Reading, the following tools and materials will be necessary:

  • Wood filler
  • Sandpaper or sanding block
  • Wood hardener
  • Screws
  • Drill
  • Centering drill bit
  • Wooden mallet
  • Chisel
  • Saw

Getting Started

Before you start, it is essential to determine the severity of the rotting issue. Assess the size and location of the rotted area before you begin the project. If the damage is extensive, you may need to replace the entire window, rather than repairing it.

Once you have established the extent of the problem, the next step is to remove the sash from the window opening. This can be done by using a wooden mallet and a chisel to pry the window frame upwards gently. Removing the frame will expose the sash, which can then be removed.

Repairing the Sash

To repair the rotted area of the sash, you will need to cut out the damaged section using a saw. Be sure to cut only the damaged area, leaving enough space to attach the replacement wood piece. Once you have removed the damaged area, check to see if the rotting has spread any further. If it has, you will need to remove the additional affected areas.

Now that you have removed the rotted section, it's time to start the replacement process. Start by measuring the size of the removed piece, and cut a replacement piece from the new wood to match the size.

Replacing the Rotted Section

When the replacement piece has been cut, use a centering drill bit to create a hole for the screw. This hole should be at the center of the new piece, in line with the existing screw hole. When the hole has been drilled, align the new piece with the existing sash, and attach it using the screw. Be sure to countersink the hole to create a smooth finish.

Project Completion

Once the repair is complete, it is essential to sand down the repaired area for a smooth finish. Use a sander or sanding block to reach any areas that you may have missed. This will help to create a uniform finish for the repaired sash.

Finally, apply a layer of wood hardener to the area to strengthen and protect the new wood from rot. Once the hardener has dried, use wood filler to fill in any gaps or imperfections that may still be visible. When the filler has dried, sand the area once again, until there is a smooth finish across the entire sash.


Repairing a rotted sash window in Reading may seem like a daunting task, but it can be accomplished with ease with the right tools and materials. With these simple steps, you can save money and preserve the original appearance of your home's sash windows.

At Sash Windows Berkshire, we are dedicated to providing reliable and efficient repair services for sash windows in Reading and the surrounding areas. We are just a phone call or email away, so don't hesitate to contact us to learn more about our services. With our expert help, you can restore your window sashes to their original glory. Contact us today at 0118 449 2798 or at [email protected].

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