How to Repair Rotten Wood With Epoxy Putty in 2021

The wood rots as a result of the growth of fungi, which arise from the presence of moisture. Rotten wood repair is ideal for areas of wood that have little structural importance, such as door or window frames.

Structural components, such as beams and pillars, should be replaced if there are signs of rot.

How to repair rotten wood

There are two ways to repair rotten wood, depending on the size of the damaged area and the state of the rest: fill with putty, or cut the rotten part and place a patch.

How to repair rotten wood you must apply some consolidating wood product, but in the case of a wood that no longer has a solution, it may be necessary to replace the piece.

Wood Filler

Peel the remains of rotten wood with a wood chisel. If you cannot remove everything until a perfect surface is free of rot, you will need to use a liquid hardener type epoxy resin, which penetrates and reinforces the damaged wood, working through the affected area and adhering to solid wood.

Drill a honeycomb design with shallow holes in the wood, with the 3/16 inch (4.57 mm) drill bit. You don’t go through the wood until the end.

Pass the hardener with a brush and leave it for about two hours, or as long as the label indicates.

Build a shape around the damaged area with hardwood or wood debris. Create a structure that matches the sides of the damaged area, leaving an open side, and paste in place with silver tape.

Spray lubricant on the figure before installing it around the damaged area. In this way, you make sure that it will leave the filler when it is time.

Fill the space between the damaged wood and the figures, with padding. Let it dry for about 10 minutes, or until the filling is solid and rubbery.

Separate the figures and scrape the excess filler with a cutter. Sand the wood with the fine-grain sandpaper to shape and smooth it.

Apply a coat of paint on the wood to seal the patch.

Learn More About: How to remove glue from wood

Wood Putty

Place a small amount of wood putty on the spatula. You will need enough putty for the size of the hole you have to fill.

Place the wood putty over the hole at a 45-degree angle and pull down to force the wood putty into the hole. Repeat this process if the hole is not completely filled with putty.

Scrape the surface of the hole to smooth the putty as much as possible.

Allow four to six hours for the wood putty to dry. Sand the wood putty gently with sandpaper.

Repeat this procedure to fill the other holes that are in the wood.

Wood Patch

Cut a block of wood of the same thickness, but slightly larger than the rotten area. Place the piece on the rotten area and mark the contour with a pencil.

Cut the rotten area along the lines you marked. Use a corner chisel, so that the edges fit comfortably into the damaged area.

Apply polyurethane glue to the patch and reinsert it into the damaged area. Hold the wood with the clamp until the glue dries.

Clamps of this type apply pressure to the top and sides of the wood, to ensure that the patch is firmly inserted into the clearance. Sand the entire area with fine grain sandpaper and apply a coat of paint or dye to seal.

Epoxy Putty

Easy to handle and work, epoxy or epoxy putty can be the perfect material to make permanent repairs of window frames in a state of decomposition, door jambs and exterior wood moldings that are difficult to remove and expensive to remove or replace.

This material, which can be purchased in paint houses, handicrafts or hardware stores, consists of two components that are mixed as dough, which is molded as modeling clay and, when it hardens, adheres strongly to the treated surfaces, does not crack nor does it appear as can happen in other wood fillers.

Here are some basic instructions on how to mix, apply and mold an epoxy putty filler to create a lasting repair on damaged or rotten parts.

First, the area surrounding the damaged wood should be tested with a punch or screwdriver to determine the extent of the rot. The soft and easily penetrated wood is rotten or begins to fall and must be removed until it meets solid areas.

At that time it is also important to determine what was the real cause of the rot and fix it before continuing with the repair.

For example, the base of a wooden structure seated directly on the concrete is more exposed to absorb moisture, which will require the performance of insulation work that prevents direct contact between the wood and the concrete.

Another problem that may arise is that the layer of paint or varnish that covers the wood is cracked or peeling, which allows water to enter and consequent rot.

So that the surface is ready to receive the treatment with the epoxy putty and to guarantee the correct adhesion of this with the wood, the remains of old paint are removed with the help of a scraper or sandpaper.

The next phase consists of the preparation of the epoxy putty, taking two equal parts of components A and B, which are mixed with a knife or spatula for two or three minutes until they are well mixed.

Do not wait for the dough to harden completely before filling the damaged wood. Generally, at 21 ° C, it will take 30 minutes before the epoxy begins to harden since this material is formulated to allow sufficient working time under normal conditions, but the temperature is the key factor. The heat accelerates the reaction and the cold makes it slower.

Therefore it is important to work in the shade and keep the materials fresh when mixing and applying the epoxy putty. So, if you want to speed up the hardening process, you can use a hairdryer or a heat gun.

With the help of a spatula or knife for fine putty, the epoxy is applied to fill the area dug in the wood.

To save putty when making large or deep repairs, it is convenient to cut or carve a block of wood to fill most of the cavity, and only then apply the epoxy mixture to glue the block before covering it with more paste.

It is recommended to use the same type of wood for repair and align the grain in the same direction as the piece to be fixed.

It is not necessary that the outer part of the filling be in perfect shape; you just have to make sure that the putty is as even as possible with the surrounding surfaces.

Once the epoxy putty hardens, it is easy to model and sand with standard carpentry tools. Roughing begins with a flat-file or coarse grit sandpaper.

It should work following the shape of the surrounding wood. When the larger irregularities have been sanded and the surface looks smoother, you can go to work on the details.

Epoxy Filler

Scrape any softwood from the surface of the wood with the chisel. This will create a small depression or hole in the wood.

Apply the epoxy filler in the hole or in the depression in the wood. Smooth the epoxy with a spatula.

Let the epoxy dry for two to four hours. Gently sand the epoxy with the sandpaper.

Read More About: remove water stains from wood at home

How to Repair Rotten Wood or Restore Rotting Wood

Do you have any furniture that you resist throwing away but that is already half rotten? You should know that the problem of rotten wood can spread throughout the furniture, so if you are determined to recover and “save” that wood it will be good to follow this step guide in which we explain how to repair the rotten wood.

The rotted wood often invariably occurs from prolonged exposure to humid conditions. Wood, being a porous material, tends to absorb moisture and also lose it.

With this, it usually swells and then ends up rotting, contributing to the development of other wood pathologies, such as mold, mushrooms, and sarcomas, so that if you have a piece of furniture with rotten wood, it will be good for you to guide yourself with these steps.

Steps to Repair Rotten Wood

Before any treatment, the first thing to do is to remove the wooden furniture from the place that caused the deterioration.

  • You must place the wood in an environment where it can dry, not forced, and can lose excess moisture accumulated in its fibers. Only when the wood is dry can you start treating the problem.
  • The drying process can take some time and, once finished, it is necessary to proceed with an appropriate treatment against woodworms and mold to prevent wood parasites from continuing to act.
  • We must then make an adequate analysis of the wood and decide how to act. In the event that the wood is very rotten and unrecoverable, the solution will be to replace that rotten piece with another piece of wood.
  • If you resist throwing, for example, a table or chairs with rotten legs, but it has no salvation, perhaps it will be good to replace those legs with new ones.
  • To do this, you must have some skill in carpentry work and if you have the necessary materials, you may need to work the piece on the lathe until it acquires the shape of the original piece. In the case of not having experience, it may be good to bring the furniture to a carpenter so that it is this that replaces the wood.
  • In the event that rotten wood can be preserved, you can resort to the application of a wood consolidant that has the function of recovering the wood in the weakened part and also giving it a certain solidity so that the problem is not repeated.
  • Often a substance like Paraloid is used, which is an acrylic resin that is diluted with acetone and can then be distributed with a brush on the part of the wood to be consolidated. You must then wait a bit for it to take effect and then clean the wood thoroughly, then sand and paint so that you can recover it completely.


Restoring rotten wood is usually worth the time. If you know what are you doing? You need to take a lot of time. When you restoring the wood, you choose to use a filler, a wood patch and you should rot wood and salvage.

I hope that we are given you a good idea about which methods you used and how to repair rotten wood. Restoring wood and preserving wood damage is a much easier process, so we recommend repair it for any wood item.

Of course, no one can preserve any wood piece but you can repair damaged wood for years to come.

You May Need:

different types wood joint

2 thoughts on “How to Repair Rotten Wood With Epoxy Putty in 2021”

  1. I have a window that are damaged but I don’t know how to repair rotten wood. After that, I found how can solve it, then I find this article and read first to last. After reading this article I can successfully repair my window. Thanks a lot.


Leave a Comment