How to Use Wood Fillers to Repair Timber Windows
Many timber windows are afflicted by rot, which can lead to a variety of problems including peeling paint windows that stick and rattle. A careful repair can keep your historic windows intact and improve their energy efficiency in the process.
The first step is to determine the extent of the rot. This can be achieved by examining the wood using a sharp instrument, and then looking through the windows for sunken, damp corners and crumbly areas of wood.
Wood Fillers
Wood fillers are a fantastic way to seal cracks and crevices that are present in old wooden windows. They are usually made from sawdust or other wood shavings that are suspended in a petroleum or water base. They can be used to fix damaged or rotting timber frames, window sills, and sash windows. They can be tinted or stained to match the existing wood, and then painted. This guide will help you select the most appropriate type of filler to suit your needs.
The first step is to clean the paint that is present, especially from the window sill. This will reveal any areas that require to be treated and will also allow you evaluate the condition of the timber. If double glazed window repairs has too much rot, it might not be able to be repaired.
The next step is to determine the source of the rot. If the wood is unstable due to lack of support, you'll need to treat it with a structural consolidant. This will help stabilize the wood and can be applied using a paintbrush. Once this has been completed the wood can be treated with a water-based wood filler, like Bondo(r). Water-based fillers for wood tend to dry faster than solvent-based fillers. They are also easier to clean up as they don't require acetone for get rid of.
Use standard acrylic latex sealant to fill the gaps between window frames and wall openings. This is a great option because it is simple to use and accepts the majority of paints. It is crucial to examine the frame for rot first because too much sanding can cause the gap to be too wide, making the window prone to leaks.
The last option is to use heavy-duty epoxy. This type of filler is formulated to withstand extreme conditions, including heat, humidity, moisture and freezing temperatures. It can be sanded, or carved when it is hard, giving you greater control over the final result. It is important to keep in mind that this kind of filler will absorb stain in a different method than natural wood, and that it is not likely to produce an exact match.
Spliced Repairs
Timber windows can add a touch of elegance to any home, and with proper care they will last for many years. However, with time they can become damaged and require a repair. Damaged window frames can be susceptible to insect infestation, and rot. They must be treated immediately to stop further degradation.
A splice is typically required to ensure that no water can infiltrate the sill or rotted wood, and also to stop damp fungus from returning to the area. The area is cleaned of all decay and fungus. The timber is then spliced and resin bonded with the window care system to insure that the joint will not move and allow moisture in.
This is an effective way to replace rotten wood and is especially beneficial in situations where splicing can be more cost-effective than replacing the entire sill. This type of repair is also a great option for replacing a small piece of rotten timber that is not affecting the surrounding timbers and isn't in need of major replacement.
It is important to use high-quality timber to repair the Splice. This will help to hold the cement and stop any movement. It is also important to scrape off all emulsion from the splice and to avoid applying too much cement that could cause it to leak through the film and leave marks on the surrounding lining paper. It is a good idea after the splice has been completed, to tape the edge to hold the repair in the correct position. Then, apply the film adhesive starting from the center to the outside (fig. 11.1 iv).
It is recommended to wrap the entire repair area with a damp prevention and treatment compound to prevent future deterioration. It is also advisable to stain or paint regularly the timbers in order to shield them from UV light and to ensure that any preservative used is still in contact with the wood for maximum protection and longevity.
Replacement Parts
Timber windows are a beautiful feature that can add a lot to the appearance of a house. Over time, they can be damaged due to dampness and extreme weather conditions. Regular maintenance can reduce the need for costly replacements and also help to extend their life.
When the wood of a window frame begins to rot, it could cause problems with the operation of the window and even lead to its collapse. If the rot is serious, it may be necessary for the timber to be replaced completely. This can be expensive. However, with the right treatment and maintenance, a timber window can be repaired to its original state without needing a complete replacement.
Repainting your windows made of timber is a great method to maintain their condition. It is a simple process that can give windows an overhaul. Before painting, it is essential to prepare the surface thoroughly, which includes sanding and taking off paint layers. Natural oils from linseed are a good choice as they provide excellent protection and are available in a range of colors. It is important to not block the draught strips using paint as this can prevent them from functioning properly.
Before starting any repairs to your windows made of timber, it is essential to check that the wood is dry. It can be difficult to do with the naked eye however it is feasible to use a moisture meter. Moisture can provide the ideal conditions for wet-rot to develop in wood, which could cause serious damage.

Cracks, splinters or soft spots should be filled straight away as they could lead to decay. It's a good idea to examine any soft areas of timber using a light pressure. Healthy wood will feel solid, but the wood that is rotting will be able to depress easily.
To stop draughts from entering the house, it is essential to inspect and adjust the draught seals that surround the window made of wood on a regular basis. The hinges and handles of a window made of timber can be tightened as well to ensure they are secure. They must be maintained in good order to increase the performance of your window.
Replacement Windows
Rather than replace the existing wooden window with a brand new uPVC one, it is sometimes possible to restore original wooden windows. It can help you save money and add value to your house. It could be as simple as repainting, re-sanding, and filling any gaps, depending on the condition of your timber window.
It is crucial to tackle the sash first, since it is usually the first component to begin to show signs. In this region, you may find rotten wood, or missing or damaged glass putty. This will ensure that the window is able to seal properly and stop water from getting into the building.
Re-sanding and painting the window can help to give it a new lease on life and bring it back to its previous glory. A quality sanding will protect the wood and ensure that the paintwork lasts for a long time.
If the sash is severely deteriorated or has been damaged, it can be replaced with a custom-made wooden replacement, designed to match the size of the existing opening. This will allow the same amount of light to enter the room and will not alter the original features of the window, such as muntins.
In some parts of the country, specifically in conservation areas, laws on planning safeguard historic details, such as intricate brickwork and plasterwork, as well as timber window frames. If this is the situation you will not be able to install a uPVC window replacement in the opening of the old one because it will not fit and could damage the brickwork surrounding the opening.
Window frames made of wood require more maintenance than uPVC ones and need to be filled with sandpaper, sanded and painted on a regular basis, but this can enhance the overall character of your property. There are however uPVC windows available that are low maintenance, so it's worth your research prior to deciding to replace your wooden windows.