# Identifying and professionally removing cellar fungus Cellar fungus (Coniophora puteana) is one of the most common, and often underestimated [wood-decaying fungi](https://protector.be/index.php?Itemid=784&lang=en) in Belgium. It primarily grows in damp areas, attacks wooden structures deeply, and can ultimately cause **serious structural damage**, even leading to the **collapse of floors or beams**. Acting quickly is crucial. This page will guide you through: - how to identify cellar fungus, - the risks it poses to your property, - the underlying causes, - how a professional treatment is carried out, - and why Protector is the best choice for a complete and permanent solution. --- | ![protector cellar fungus](https://protector.be/images/content/protector-kelderzwam.jpg "protector cellar fungus") | ## What is cellar fungus (Coniophora puteana)? Cellar fungus is a brown rot fungus capable of **breaking down the cellulose in wood**, causing the wood to lose its strength and durability. The result: wood that was once strong and load-bearing turns into a spongy, dark brown, brittle mass that crumbles under light pressure. ### How does cellar fungus develop? Cellar fungus emerges and grows in conditions where three elements are present: - Moisture - Wood - Insufficient ventilation When the moisture content in wood rises to **around 50–60%**, cellar fungus finds ideal living conditions. It forms mycelium, penetrates the wood, spreads to other structures, and eventually develops a fruiting body capable of releasing spores. | |---|---| --- ## Why does cellar fungus mainly grow in damp areas? This fungus depends on water. Unlike dry rot, cellar fungus cannot **bore through masonry** but can crawl **over** walls and stone surfaces if sufficient moisture is present. Typical moisture sources: - a leaking pipe - [rising damp](https://protector.be/index.php?Itemid=790&lang=en) - rainwater infiltration - [condensation](https://protector.be/index.php?Itemid=792&lang=en) - poor ventilation in crawl spaces, cellars, or technical rooms ### Difference between cellar fungus and dry rot | Feature | Cellar Fungus | Dry Rot | |---|---|---| | Scientific name | Coniophora puteana | Serpula lacrymans | | Grows... | only on very damp wood | on wood and through walls | | Growth rate | slower | very fast | | Risk | serious | extremely serious | | Fruiting body | dark green to olive | reddish-brown with white edge | Although [cellar fungus](https://protector.be/index.php?Itemid=786&lang=en) grows more slowly than [dry rot](https://protector.be/index.php?Itemid=785&lang=en), the eventual damage can be **equally severe**. --- | ## How to recognise cellar fungus? Recognising cellar fungus in time can prevent thousands of euros in damage. Use the checklist below. ### Visible characteristics Cellar fungus may appear as: - **Mycelium threads** Fan-shaped, spread over large surfaces. Colour: pale red, dark brown to almost black. - **Fruiting body** Dark brown to olive green. Edges cottony, fibrous, and cream-white. - **Affected wood** dark brown, crumbly, deeply cracked, crumbles on touch, loses load-bearing capacity - **Odour** A typical “musty cellar smell” or damp wood scent. ### Checklist: Do I have cellar fungus? You are highly likely to have cellar fungus if you recognise at least **2** of the following symptoms: - musty smell in cellar / crawl space - suspicious discoloration on wood (brown, black, or olive) - threads or flakes on wood or walls - wood that breaks easily - moisture problems in the same area - fungal growth resembling spreading “fans” If you see one or more of these signs, call a specialist for an inspection. | |---| --- | ## Risks & damage caused by cellar fungus Cellar fungus is not just an aesthetic issue but a structural problem. ### Wood rot & collapse risk As cellar fungus breaks down cellulose, wood loses: - its load-bearing capacity, - its cohesion, - its stability. A wooden floor or beam structure that was perfect 10 years ago can literally **sag** today. ### Spread to other areas Cellar fungus can spread through: - humidity - infected wood in contact with other structures - condensation on cold walls - water flows or leaks Although it does not bore through masonry like dry rot, it can easily spread via skirting boards, cupboards, panelling, and floor joists. ### Health risks Fungi often produce spores that can: - worsen allergies, - trigger respiratory infections in sensitive individuals, - reduce air quality. | ![protector cellar fungus risk damage](https://protector.be/images/content/protector-kelderzwam-risico-schade.jpg "protector cellar fungus risk damage") | |---|---| | ## Causes of cellar fungus ### Wood moisture content: 50–60% Cellar fungus thrives in very wet conditions. That’s why it is mainly found in: - cellars - crawl spaces - older houses - poorly ventilated rooms ### Water infiltration One of the most common causes. Typical problems: - leaking drainpipes - leaky roof - failed gutters - infiltration through cellar walls - wet floor joists after flooding ### Condensation and cold bridges Modern homes are often airtight, leading to **condensation** on cold surfaces. ### Typical Belgian risk properties - Townhouses with wooden structures - Houses built between 1940–1980 - Terraced houses with damp partition walls - Old cellars with limited ventilation - Living spaces with wooden floors above damp areas | |---| --- ## How is a professional cellar fungus treatment carried out? A professional treatment ensures the fungus is **completely and permanently** removed. Here is the full Protector process. ### 1. Diagnosis & Inspection An expert visits the site for a thorough analysis of: - the source of moisture - the extent of the fungus - the structure of the affected wood - risks for other areas ### 2. Eliminate the cause of moisture No treatment makes sense while moisture persists. Protector first addresses the cause, such as: - repairing leaks - solving infiltration - improving ventilation - treating rising damp - cellar sealing if necessary ### 3. Remove affected wood All contaminated areas are removed until only healthy wood remains. Protector also checks: - hidden wood behind plasterwork - floor joists in contact with walls - skirting boards and panelling - subfloors ### 4. Intensive deep cleaning All structures that came into contact with cellar fungus are thoroughly cleaned. ### 5. Chemical treatment We treat all surfaces with an appropriate cellar fungus control agent. ### 6. Wood replacement & aftercare Damaged wood is replaced with new wood that: - has been pre-treated against fungi, - is properly dried, - is protected according to Protector’s strict quality standards. ### 7. Finishing & restoration Protector also carries out all additional work: - [restore plasterwork](https://protector.be/index.php?Itemid=794&lang=en) - repair joinery - refinish surfaces --- ## Prevention of cellar fungus | ### 1. Moisture control repair leaks professional cellar sealing avoid water accumulation ### 2. Ventilation - install vents - mechanical ventilation - carry out moisture measurements | ### 3. Regular inspection - Periodic inspection by the homeowner significantly reduces risk. ### 4. Risk zones per property type - old cellar spaces - damp storage rooms - crawl spaces - adjacent bathrooms | |---|---| --- | ![protector cellar fungus treatment price](https://protector.be/images/content/protector-kelderzwam-bestrijding.jpg "protector cellar fungus treatment price") | ## Price of cellar fungus treatment The price depends on: - extent of contamination - accessibility - amount of wood to be replaced - chosen treatment - additional work Subsidies may be available if linked to moisture solutions (e.g., grant via Fluvius). | |---|---| --- | ## Protector operates throughout Belgium \| - Antwerp Tel.: [0475 96 97 97](tel:+32475969797) - Limburg Tel.: [0475 96 97 97](tel:+32475969797) - East Flanders Tel.: [0475 96 97 97](tel:+32475969797) - West Flanders Tel.: [0475 96 97 97](tel:+32475969797) - Flemish Brabant Tel.: [0475 96 97 97](tel:+32475969797) \| - Brussels Tel.: [02 526 07 70](tel:+3225260770) - Walloon Brabant Tel.: [0477 76 75 55](tel:+32477767555) - Namur Tel.: [0477 76 75 55](tel:+32477767555) - Hainaut Tel.: [0477 76 75 55](tel:+32477767555) - Luxembourg Tel.: [02 526 07 70](tel:+3225260770) \| ![protector kantoren](https://protector.be/images/protector-kantoren-kaart-fr.png) \| \|---\|---\|---\| | |---| --- | ## Why choose Protector? - **Complete service from A to Z** Unique in Belgium: Protector carries out all steps itself, from diagnosis to full restoration. - **Experience** 40 years of experience in fungus control for both historic and modern homes. - **Specialised in occupied properties** Our work areas are shielded so you don’t feel like you’re living on a construction site. - **Guarantee** Treatment comes with a 20-year guarantee. - **Local experts** Direct phone numbers available per province. | |---| --- | ## Ready to remove cellar fungus permanently? Protector is ready with a certified team, years of experience, and proven techniques to make your home safe, dry, and healthy again. [Ask us a question](mailto:info@protector.be?subject=I%20would%20like%20to%20receive%20some%20more%20information%20about%20Protector) [Get a free quote](https://protector.be/index.php?Itemid=801&lang=en) [ Call us for free 0800 30 163 ](tel:080030163) | |---| --- ## Recognising, treating & preventing cellar fungus: answers to the most common questions ### How do I recognise cellar fungus at an early stage? Cellar fungus usually starts subtly, so many owners notice damage only late. At the early stage, you mainly see pale to dark brown, fan-shaped threads on or around damp wood. A musty, damp smell often indicates early fungal growth. Wood that darkens quickly or gives way under light pressure is an important warning sign. Spots or unusual discoloration on skirting boards, beams, or floorboards can also indicate cellar fungus. The sooner you recognise these signs, the lower the risk of structural damage and the easier the treatment will be. ### Can cellar fungus spread to other areas? Yes. Although cellar fungus is less aggressive than dry rot, it can spread through damp wood, skirting boards, subfloors, and structures in contact with infected material. It easily adheres to surfaces with sufficient moisture and can grow ‘over’ walls, floors, and metal structures. The greatest risk is often in hidden areas, such as behind plasterwork or in crawl spaces. This is why a specialist inspects both visible and non-visible parts of the property. Quick action prevents further spread and additional damage. ### Is cellar fungus dangerous for my health? Cellar fungus itself is not toxic, but as with most fungi, spores can affect air quality. People with allergies, asthma, or sensitive respiratory systems may experience irritation or breathing issues. The greater danger, however, comes from the structural damage cellar fungus causes: weakened beams, floorboards, and load-bearing structures can become unstable. This can create a potentially dangerous situation, especially if the infestation has been present for some time. Professional removal and restoration are therefore essential for a safe and healthy home. ### How is a professional cellar fungus treatment carried out? A professional treatment begins with a thorough diagnosis lasting **30 to 60 minutes**. Once the moisture causes are resolved by a plumber or contractor, the specialist removes all affected wood until only healthy wood remains. All surfaces that came into contact with the fungus are then intensively cleaned and treated with a cellar fungus control agent. Affected beams, floors, or structures are replaced with new, pre-treated wood. Finally, everything is neatly finished so your home is safe, stable, and completely fungus-free. ### How quickly can I have cellar fungus removed? The speed depends on the severity of the infestation, but Protector can usually dispatch an expert quickly for a diagnosis. After the inspection, a detailed treatment plan is prepared. The actual treatment usually takes 2 to 5 days, depending on the amount of affected wood and necessary restoration work. Since Protector specialises in working within occupied homes, disruption is minimal and all areas are carefully shielded, allowing the treatment to take place without having to vacate your home. ### Will cellar fungus return after treatment? When the treatment is correctly executed and the moisture source fully resolved, cellar fungus should not return. The key factor is permanently addressing the source: leaks, condensation, or infiltration must be completely remedied. Protector not only removes the fungus but also tackles the underlying cause and uses techniques that prevent re-infestation. Additionally, affected wood is replaced with pre-treated wood. Periodic inspections by the homeowner help detect new moisture problems early. ### How much does it cost to have cellar fungus professionally removed? The cost of cellar fungus treatment depends on the extent of the infestation, accessibility, the amount of wood to be replaced, and required restoration work. Protector always provides a transparent, tailored quote, including cause treatment, fungus removal, wood replacement, and finishing. In some cases, subsidies are available, especially if the cause is moisture-related. This gives you a clear, complete picture of the total cost and what to expect. [to top](#) | | ## What Our Customers Say "We are extremely pleased with your employees who were on-site last week. Friendly and helpful people who delivered very neat work, especially with the demolition of partitions and ceilings, which was not easy. Amazingly, they managed to keep the dust contained within the work areas. Our other living spaces remained untouched. It was great to see how your team left our site each day: work areas swept clean and materials neatly put aside. Truly commendable, and everyone should know this!" Sophie Cuylits | |---|---|