What happens if wood rot is left untreated?

Author: Prof. Cortez Waelchi  |  Last update: Wednesday, February 4, 2026

If left untreated over a prolonged period of time, the timber affected by the wood rotting fungi can breakdown and weaken. Once the timber has been weakened enough, it will eventually collapse. This is a serious health and safety concern.

What happens if you don't fix wood rot?

At best, rot is an eyesore that ruins the finish of your wood. At worst, it can cause severe structural damage. If you catch it early enough, it's a quick and easy repair, and you won't have to replace any timber.

Can rotting wood make you sick?

You can get blastomycosis by contact with moist soil, most commonly where there is rotting wood and leaves. The fungus enters the body through the lungs, where the infection starts. The fungus can then spread to other parts of the body. The disease may affect the skin, bones and joints, and other areas.

How long does untreated wood take to rot?

In general, when wood is continuously exposed to moisture and favorable conditions, it can start to show signs of rot in as little as a few months to a few years. In more extreme cases, untreated wood can completely decay within a decade.

Can a house collapse from dry rot?

While it's rare for a house to collapse entirely from dry rot, the possibility can't be ruled out, especially if the problem has been ignored for a long time. The real issue is when dry rot affects important parts of the home, like load-bearing beams and structural supports.

THE TRUTH ABOUT WOOD ROT (You need to watch this!!)

Does homeowners insurance cover dry rot?

Like mold, dry rot is not generally covered in a standard homeowner's policy. However, like mold, there are some exceptions to this rule, depending on the cause of the dry rot.

Can you live in a house with dry rot?

While dry rot spores are not harmful themselves, a house with dry rot isn't a pleasant place to live in, especially with the smell of damp soil filling the air. The damp conditions pose a health hazard for infants, older people, and those with respiratory diseases.

Does wood rot keep spreading?

Wet rot needs a lot of moisture in order to grow, while dry rot can continue to spread regardless of whether the infected area is wet. Fortunately, this means that wet rot often confines itself to those select, damp areas.

Does it hurt untreated wood to get wet?

Pro-tip: If there's a spill, or your untreated planks just need a little more love than dusting can bring, wipe the area with a damp rag or washcloth and allow time to dry. Don't soak it though! Prolonged exposure can cause untreated wood to deteriorate.

Does painting wood prevent rot?

Sealing, Painting, and Staining to Prevent Wood Rot

Use high-quality stain, primer, and paint on all exposed wood surfaces to create a protective barrier against moisture. Seal cuts, joints, and end grains, and even the back sides of boards where water can get in and cause damage.

Will vinegar stop wood rot?

White vinegar will stop wood rot

Because it is a fungicide, which has antimicrobial properties. As wood rot is caused by fungi that require an acidic environment ranging from 0-5.5 (pH), white vinegar solves the problem by changing the pH level in the wood.

What happens if wet rot is left untreated?

If left untreated, wet rot can cause timber and other materials to become soft and spongy, which can lead to collapse or other safety hazards. Additionally, wet rot can provide a breeding ground for other pests, such as insects and rodents, which can cause further damage to buildings and potentially spread disease.

Does rotting wood always mean mold?

Wood rot looks like decay, whereas mold on wood usually looks like discoloration. While mold is by no means good, it is better than wood rot for homes. However, as both wood rot and mold form in damp and humid environments, the presence of mold can signal that wood rot is soon to follow.

Can I just paint over rotten wood?

Wood that is rotting needs to be replaced before painting or any other installation is performed. Unfortunately, too many people believe that simply painting over rotted wood will stop the deterioration.

Does wood rot always mean termites?

The most common type of wood rot that often gets mistaken for termite damage is called dry rot. Dry rot is a fungus that attacks the wood and hollows it out from the inside. Dry rot also makes the wood spongy and soft, weakening it.

How do you fix rotting wood without replacing it?

Rotten wood can be repaired. Start by removing the rotting parts from the original board or joists. Then, fill the surrounding wood area with a soft wood polyester filler or wood putty using a plastic putty knife. This material fills the void and cures to ensure strength and resilience.

How long before untreated wood rots?

As mentioned above, the answer to this question can vary from one type of wood rot problem to another. Since the timing actually depends on the type of problems that exist, the timing can range from about 7 to 10 days to one month and more.

How to tell the difference between treated and untreated wood?

Smell it! The chemicals used to treat lumber are ridiculously effective at preserving the wood. However, these same chemicals give off an extremely strong scent that can be detected very easily. If your lumber smells oily or like gasoline, it's treated.

How to treat untreated wood for outdoor use?

Untreated wood is the most susceptible to rot, fungi, and general weathering. It's extremely important that you use a wood preservative first. You can either use a wax enriched preservative for an all-round coating or alternatively use a wax-free preserver if you want to then use a stain or a paint on top.

Can you stop wood rot once it starts?

In some extreme cases you will need to replace the affected timbers. However, in most cases you can stop wet rot by treating the timber with a fungicide. The treatment of wet rot involves applying a fungicide during the drying out period.

Is dry rot covered by insurance?

Insurers view dry rot as a consequence of long-term issues like poor ventilation or dampness. These are considered wear and tear, which isn't covered by standard policies. Building insurance protects against unforeseen events, not problems caused by a lack of maintenance.

What happens if you don't replace rotted wood?

If rotted wood isn't taken care of, permanent structural damage will happen. Your timber—or any other material in your home—will deteriorate and collapse. Buildings can fall apart if they have problems with rotten wood that don't get taken care of immediately.

What kills dry rot?

Fungicides to defeat brown rot include: baking soda, hydrogen peroxide, tea tree oil, boron solutions, ethylene glycol or propylene glycol, vinegar, etc. Since the dry rot fungus requires an acidic environment from pH 0 to 5.5, certain of these fungicides work because they change the pH.

Can a house be saved from dry rot?

Strategies to prevent recurrence include improving ventilation, reducing moisture, and potentially using antifungal treatments to protect wood. With the right approach and timely action, a house can be rescued from dry rot and restored to a safe, stable condition.

Can I treat dry rot myself?

Getting rid of the infected materials is the first step in your dry rot treatment programme. You will need to contact a professional. Depending on the extent of your dry rot problem, you might need to remove a lot of structural timber from your home, so it's best to have an expert on hand.

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