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Lignum Pro M50 is a high-quality concentrated biocide specifically designed for the eradication of dry rot in masonry and brickwork. This HSE approved product dilutes with water to produce 25 litres of ready-to-use solution, offering deep and even penetration into the substrate.
Its micro-emulsion technology delivers rapid absorption and high active loading, ensuring effective treatment with long-term protection. The water-based formulation is virtually odourless, non-flammable, quick-drying, and contains zero VOCs, making it an ideal solution for dry rot treatment in various environments.
Lignum Pro M50 should only be used on Masonry substrates. For an effective Dry Rot Treatment for use on Timber, see Lignum Pro D156 or Lignum Pro Gel.
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✔️ Dilutes to make 25 litres of ready-to-use product, providing convenience and cost-effectiveness.
✔️ Specially formulated for the eradication of dry rot in masonry and brickwork, ensuring thorough treatment.
✔️ Provides deep and even penetration, ensuring long-term protection against dry rot.
✔️ Micro-emulsion water-based formulation with rapid absorption and high active loading for optimal efficacy.
✔️ Virtually odourless, non-flammable, quick-drying, and contains zero VOCs, making it environmentally friendly and safe for indoor use.
Lignum Pro M50 is a high-performance concentrated biocide specifically engineered for the treatment and eradication of dry rot in masonry and brickwork. Designed to combat the destructive effects of Serpula lacrymans, one of the most aggressive dry rot fungi, this professional-grade solution is HSE approved under Approval No. 10177. When diluted, each 1-litre container produces up to 25 litres of ready-to-use treatment, making it an economical and efficient option for both localised outbreaks and larger remedial works.
Formulated using cutting-edge micro-emulsion technology, Lignum Pro M50 features an ultra-fine particle size in the nanometre range. This allows for deep and consistent penetration into porous substrates such as brick, block, mortar, and concrete. The superior absorption profile ensures that the active ingredients are delivered where they are needed most—deep within the affected structure—making it particularly effective in targeting embedded fungal growth and spores within the masonry matrix.
Lignum Pro M50 is especially effective in sub-floor oversite sterilisation, where dry rot outbreaks can spread undetected through concealed voids. Its high active loading and rapid uptake by masonry materials ensure a robust treatment layer that helps prevent future fungal colonisation. In addition to its direct application to masonry surfaces, the solution may also be incorporated into gauging water during the re-rendering process, ensuring continued biocidal protection within new render layers.
As a water-based formulation, Lignum Pro M50 offers distinct advantages in terms of safety and environmental performance. The solution is virtually odourless, non-flammable, and contains no volatile organic compounds (VOCs), making it suitable for use in occupied properties and enclosed spaces. Its quick-drying nature reduces downtime and facilitates faster project turnaround, while its non-hazardous profile supports a safer working environment for contractors and occupants alike.
Suitable for use in both residential and commercial settings, Lignum Pro M50 is a trusted solution for dry rot control in heritage restorations, new builds, and refurbishment works. Its compatibility with damp-proofing and re-rendering systems further enhances its versatility, allowing it to be seamlessly integrated into comprehensive moisture management strategies. Whether applied to walls, floors, or voids, this biocide delivers dependable and long-lasting protection against fungal decay.
Backed by HSE certification and trusted by professionals across the construction and preservation industries, Lignum Pro M50 is a benchmark product in dry rot treatment. Its combination of cutting-edge technology, deep penetration, and environmental safety makes it an essential component of any effective timber and masonry preservation programme.
Lignum Pro M50 carries the HSE Approval No 10177.
Advanced Penetration via Micro-Emulsion Technology: The nanometre-scale particle size allows the solution to deeply penetrate brick and masonry substrates, ensuring thorough sterilisation of areas affected by fungal growth, including inaccessible voids and cracks.
Highly Effective Against Serpula Lacrymans (Dry Rot): Formulated specifically to target and destroy Serpula lacrymans, one of the most aggressive forms of fungal decay encountered in building structures. Its active loading ensures consistent and reliable results.
Concentrated Formulation Dilutes to 25 Litres: Supplied as a 1-litre concentrate, Lignum Pro M50 dilutes with water to create 25 litres of ready-to-use treatment, offering excellent value for money and ease of transport and storage.
Versatile Application Methods: Can be applied by brush, spray or injection, making it suitable for a wide range of site conditions, including sub-floor voids, walls, and brickwork joints where traditional surface application might be inadequate.
Incorporation into Re-Rendering Works: May be used in gauging water during re-rendering, allowing biocidal protection to be built into the plaster layer itself, reducing the risk of re-infestation in treated areas.
Virtually Odourless and Non-Flammable: Safe to use in enclosed or sensitive environments. The water-based formula emits minimal odour and contains no flammable solvents, improving safety for operatives and occupants.
VOC-Free and Environmentally Conscious: Contains no volatile organic compounds, aligning with modern best practices for health and safety, and reducing environmental impact during and after application.
HSE Approved (No. 10177): Fully compliant with UK regulations for biocidal treatments, providing assurance of effectiveness and safety in use.
Masonry and Brickwork Sterilisation: Ideal for treating infected walls and brickwork in areas where dry rot has spread. The deep penetration ensures the active ingredients reach and eradicate hidden mycelium.
Sub-Floor Oversite Treatment: Essential for sterilising oversite concrete in sub-floor voids where timber has been removed due to dry rot. Prevents regrowth and prepares the area for safe reinstatement of structural timbers.
Pre-Reinstatement Remedial Works: Used as part of a comprehensive dry rot eradication programme before timber floors, joists, or other fixtures are reinstalled. Reduces long-term risk of decay returning.
Incorporation into Re-Render Mixes: Can be mixed with gauging water during the rendering of treated areas, ensuring that the render itself contains biocidal properties to resist future fungal growth.
Basement and Cellar Restoration: Well-suited for use in lower ground areas with persistent damp issues and fungal contamination. Helps sterilise affected surfaces before waterproofing or tanking applications are applied.
Dry Rot Outbreaks in Heritage or Listed Properties: Safe for use in historic buildings where minimal disruption and effective treatment are essential. Does not alter the appearance of masonry and is compatible with conservation principles.
IPBC (3-Iodo-2-Propynyl Butyl Carbamate) is a key ingredient in Lignum Pro M50 Biocide, helping to fight dry rot in walls made of bricks and stone. When this chemical is used, it prevents the fungus from building its cell walls correctly, which stops it from growing and spreading.
The Lignum Pro M50 Biocide formula is designed to soak deep into the affected material, reaching the root-like parts of the fungus that can cause damage. This deep reach means the treatment works effectively and provides lasting protection, as it can keep fighting any leftover fungus spores. Since IPBC works especially well against the dry rot fungus, it makes the biocide a focused treatment for this common problem in buildings. The product, with IPBC, is a powerful and targeted way to protect structures from the damage caused by dry rot.
The active ingredients in the formulation are sourced and supplied by manufacturers who have supported their compounds through the Biocidal Products Directive [98/8 EC] or more recently the Biocidal Products Regulations [528/2012] and in compliance with Article 95 of the Biocidal Products regulations.
When handling or applying Lignum Pro M50 Biocide, always take the appropriate health and safety precautions. Ensure that suitable personal protective equipment (PPE) is worn at all times, including gloves, safety goggles, and a suitable face mask or respirator to prevent inhalation of airborne particles or spray mist.
Operatives should observe normal hygiene practices and avoid eating, drinking, or smoking while using the product. Always consult the label and read the full Material Safety Data Sheet (MSDS) prior to use. The product should be stored securely, out of reach of children and animals, in a dry, cool environment.
Lignum Pro M50 is specifically formulated for application onto masonry, brickwork, and oversite concrete affected by fungal growth. It is designed for use in structures experiencing active dry rot outbreaks, especially those caused by Serpula lacrymans.
The product should not be used on decorative surfaces or substrates not compatible with water-based treatments. Surfaces must be porous and capable of absorbing the biocide solution for it to be effective. It is suitable for interior or sub-floor applications where active dry rot is present and masonry sterilisation is required.
Before applying the biocide, it is essential to assess the full extent of the fungal outbreak. This requires opening up the affected structure, removing infected timber, and cutting back all in-situ timbers at least 500mm beyond the last visible signs of fungal growth or strand development.
Remove plaster or render back to brickwork or masonry to a distance of 500mm beyond the visible signs of contamination in all directions. Identify and resolve any moisture issues contributing to the outbreak, such as leaking rainwater goods, defective damp proof courses, or inadequate ventilation.
Clean all wall surfaces and oversite areas thoroughly, removing all fungal mycelium and strands with a stiff brush or mechanical aid as required. Only once the area has been fully exposed, cleaned, and made structurally ready should application proceed.
Lignum Pro M50 must be diluted prior to use. A 1-litre container should be mixed with 24 litres of clean water to make 25 litres of ready-to-use solution. Mix thoroughly to ensure a uniform emulsion before application.
The diluted product may be applied using a brush, coarse spray, or injection depending on the level of fungal penetration. For surface sterilisation, apply the solution liberally to all exposed masonry and brickwork using a coarse, low-pressure spray, ensuring that all areas are saturated.
Where dry rot has extensively penetrated the wall structure, drill holes to two-thirds the depth of the wall at 230mm staggered centres and a downward angle into the mortar beds. These should then be filled with the biocide via an appropriate irrigation method to ensure internal saturation. Ensure good ventilation throughout the treated area and do not cover the treated surfaces until fully dry.
The typical coverage rate for surface spraying is 1 litre of diluted solution per 5m², depending on the absorbency of the substrate.
For deep wall irrigation, approximately 10 litres of diluted solution is required per 1m³ of masonry.
Actual coverage may vary according to the porosity, surface condition, and severity of fungal penetration.
Drying times will vary based on the type of substrate, thickness of application, and environmental conditions. As a general guide, treated surfaces should be allowed to dry thoroughly before reinstatement or covering.
Do not allow unprotected persons or animals to come into contact with treated surfaces until they are fully dry. Ventilation during and after application will assist with drying and odour dissipation.
All tools, containers and equipment should be cleaned thoroughly with water immediately after use. Do not allow residues to enter watercourses or drainage systems. Contaminated PPE should be either disposed of safely or decontaminated as per local regulations.
Lignum Pro M50 is a water-based formulation with no volatile organic compounds (VOCs), making it safer for indoor application and more environmentally responsible than solvent-based alternatives.
The product is non-flammable and virtually odourless, making it ideal for use in sensitive environments such as sub-floor voids or heritage buildings. Once diluted, the solution should be used promptly. The concentrated product has a shelf life of two years when stored in unopened, original packaging under ambient conditions.
After two years, it is recommended that the product is re-tested every six months to confirm that the active ingredient levels remain within specification. Always adhere to the statutory conditions of use and consult HSE Approval No. 10177 for full compliance details.
A) Lignum Pro M50 Biocide Masonry Dry Rot Treatment is specifically formulated to eradicate dry rot caused by the fungus Serpula lacrymans in masonry substrates such as brickwork, blockwork, mortar, and concrete. It is a concentrated biocidal solution that, when diluted, deeply penetrates porous surfaces to destroy active fungal infestations and prevent their recurrence. The product is particularly effective in sub-floor areas, wall voids, and other concealed spaces where dry rot often spreads unnoticed. It is also suitable for treating surfaces prior to reinstatement works, forming part of an integrated approach to fungal control and structural preservation in damp-affected properties.
A) Lignum Pro M50 utilises micro-emulsion technology, enabling the active ingredient to break down into ultra-fine particles capable of deeply penetrating masonry materials. This allows the biocide to reach the hidden mycelium and spores of the Serpula lacrymans fungus, disrupting its ability to spread. The product’s active ingredient, IPBC (3-Iodo-2-Propynyl Butyl Carbamate), targets the cell membranes of fungal organisms, causing them to collapse and die. By saturating the substrate with this active compound, Lignum Pro M50 ensures long-term protection and stops the regrowth of dry rot in treated areas.
A) Lignum Pro M50 is designed exclusively for use on masonry substrates, including brickwork, concrete, mortar, stone, and oversite slabs. These porous materials allow the biocide to absorb effectively and penetrate deeply where fungal growth often resides. The product should not be used on timber, metal, glass, or any non-porous or decorative surfaces. It is particularly useful in sub-floor environments and for treating wall cavities and render-free masonry where dry rot has spread. It is not intended for timber applications, for which other products such as Lignum Pro D156 or Lignum Pro Gel are recommended.
A) Yes, Lignum Pro M50 is a water-based, virtually odourless, and VOC-free formulation that is safe for indoor use when applied correctly. It contains no flammable solvents and poses minimal risk to indoor air quality. As with all chemical treatments, it must be used with proper ventilation and standard personal protective equipment. Treated areas should remain unoccupied until the surface is dry to the touch, and good airflow should be maintained during and after application to assist drying and odour dissipation.
A) Lignum Pro M50 must be diluted prior to application. One litre of the concentrated product should be mixed with 24 litres of clean water to yield 25 litres of ready-to-use solution. This mixture must be thoroughly stirred to ensure uniform dispersion of the active ingredient throughout the solution. Once diluted, the product should be used promptly and not stored for future use. Shake the concentrate thoroughly before dilution to ensure the ingredients are evenly distributed.
A) Lignum Pro M50 can be applied using a coarse spray, brush, or by injection, depending on the severity and location of the dry rot infestation. For surface sterilisation, liberal application using a low-pressure coarse spray or brush ensures effective coverage. Where dry rot has penetrated deep within masonry, holes can be drilled and the solution injected to deliver the biocide directly into the structure. For comprehensive treatment, combining surface application with injection is often recommended.
A) Yes, Lignum Pro M50 can be incorporated into the gauging water used to mix new render. This allows the biocide to be embedded within the render layer itself, offering ongoing protection against fungal regrowth. This method is particularly useful in areas that have been stripped of contaminated plaster as part of a remedial damp or dry rot treatment programme. The inclusion of biocide within the render ensures that fungal spores do not colonise the newly treated surfaces in future.
A) Coverage will depend on the porosity of the surface and the method of application. For surface spraying, 1 litre of diluted Lignum Pro M50 typically treats around 5m². For deeper wall irrigation via drilled holes, approximately 10 litres of diluted solution is needed per 1m³ of masonry. More porous materials and highly contaminated areas may absorb greater quantities, so coverage should be assessed on-site based on conditions.
A) Drying times for Lignum Pro M50 vary depending on temperature, humidity, and the type of surface treated. In general, treated surfaces should be allowed to dry completely before re-covering or reinstating finishes. Under average indoor conditions, drying may take several hours, but this can extend in damp or poorly ventilated areas. Ensuring good airflow during and after treatment will speed up the drying process and ensure that the biocide cures properly.
A) While Lignum Pro M50 is primarily intended for active dry rot eradication, it may also be used as a preventative measure in areas considered at high risk for fungal colonisation, particularly where conditions favour the spread of Serpula lacrymans. For example, in sub-floor voids where previous outbreaks have occurred or in newly treated masonry adjacent to decayed timber, applying Lignum Pro M50 can reduce the risk of future infestation. However, prevention is best achieved as part of a wider damp control strategy.
A) Yes, Lignum Pro M50 is fully approved under HSE No. 10177 and is widely used by professional contractors, surveyors, and preservation specialists. The product meets all relevant UK standards for biocidal treatments in construction and conservation work. Its approval ensures that it has undergone rigorous testing for both efficacy and safety in eradicating dry rot fungi in masonry environments.
A) Lignum Pro M50 is well-suited for use in historic and listed buildings due to its water-based, non-volatile, and non-staining nature. It penetrates deeply without altering the appearance or texture of the masonry, making it appropriate for use in conservation-sensitive settings. The low odour and absence of flammable solvents also support its safe use in enclosed or delicate environments where traditional solvent-based treatments may be inappropriate.
A) Lignum Pro M50 offers several advantages over older fungicidal products. Its micro-emulsion formulation allows for far deeper and more uniform penetration of the masonry substrate, improving its ability to eradicate fungal spores hidden in small cracks and pores. Additionally, it is water-based, safer to handle, has virtually no odour, and does not contribute to indoor air pollution, unlike traditional solvent-based treatments. These qualities make it more effective, environmentally friendly, and user-safe.
A) Yes, once the treated surface is fully dry, it may be painted, rendered, or otherwise finished. If using Lignum Pro M50 in conjunction with re-rendering works, it may be incorporated into the render mix as part of the gauging water. This approach helps to ensure ongoing biocidal protection within the plaster layer. If painting, only breathable finishes should be used until the structure has fully dried and all residual moisture has escaped.
A) Lignum Pro M50 is a non-flammable product and contains no volatile organic compounds, making it safer to store and apply than many solvent-based alternatives. While it is not classified as highly toxic, it is still a biocide and must be handled with care. Personal protective equipment should always be used, and exposure to skin, eyes, and respiratory pathways must be avoided. Ensure the treated area is ventilated and inaccessible to pets and children until fully dry.
A) Thorough preparation is essential for the success of any dry rot treatment. All infected and suspect timbers must be removed, including an additional 500mm beyond the last visible signs of contamination. All plaster, render, and surface finishes should be stripped back to bare masonry to the same extent. The exposed masonry must be cleaned to remove fungal growth, and any moisture ingress issues must be resolved before applying the biocide. Once the area is exposed and dry, Lignum Pro M50 can be applied.
A) When applying Lignum Pro M50, wear appropriate PPE including nitrile gloves, safety goggles or a face shield, protective clothing, and a suitable mask or respirator if spraying. Although it is a low-odour, non-volatile product, protection is essential to prevent skin or eye contact and to avoid inhaling any fine spray particles. Ensure that PPE is cleaned or disposed of after use according to safety guidelines.
A) It is not recommended to store Lignum Pro M50 once diluted. The ready-to-use solution should be applied promptly after mixing to maintain its effectiveness. The concentrated product, however, has a shelf life of two years when stored in its original, sealed packaging in cool, dry conditions. After this period, it should be re-tested at six-month intervals to confirm that the active ingredient remains within specification.
A) Lignum Pro M50 is intended primarily for interior or sub-floor use in buildings where dry rot infestations are present. While it can technically be used on external masonry affected by fungal growth, its biocidal activity is optimised for indoor masonry sterilisation where conditions allow for full absorption and controlled drying. If used externally, weather exposure and runoff may diminish its efficacy unless steps are taken to protect the treated area during curing.
A) Lignum Pro M50 is formulated without volatile organic compounds (VOCs), flammable solvents, or harmful gases, making it safer for the environment and for indoor air quality. It is water-based and virtually odourless, with no lasting emissions that could harm occupants or contribute to environmental pollution. Its safety profile and targeted application ensure that it delivers effective fungal control while aligning with responsible ecological practices.
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