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The Soudal SoudaGum LM Tanking Kit is a complete, ready-to-use waterproofing system specifically designed for use in wetrooms, showers, bathrooms and other interior areas subject to temporary water exposure.
This three-part system provides a seamless, flexible waterproof membrane that can be tiled over once cured. The kit includes SoudaGum LM waterproofing liquid membrane, SoudaPrim DP primer, and SoudaTape ST reinforcing tanking tape. It is environmentally friendly, solvent-free, permanently elastic and resistant to alkalis and lime water.
Compliant with EN 14891:2017, it delivers reliable and durable waterproof protection prior to tiling.
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✔️ Complete three-part system includes primer, membrane, and tape for thorough and reliable waterproofing coverage.
✔️ Forms a seamless, permanently elastic membrane that accommodates movement and surface irregularities.
✔️ Quick drying time with tiles ready to be applied just twelve hours after membrane application.
✔️ Adheres to multiple substrates without solvents or mixing, suitable for vertical and horizontal surfaces.
✔️ Fully compliant with EN 14891 for waterproofing beneath tiling in wetrooms, bathrooms, and showers.
The SoudaGum LM Tanking Kit is a high-performance, three-part waterproofing system specifically engineered to protect internal surfaces exposed to intermittent or temporary water contact. Whether used in residential bathrooms, commercial wetrooms, or shower enclosures, this complete solution provides a seamless, watertight barrier that safeguards substrates such as plasterboard, concrete, and cement render. Its advanced formulation ensures long-term protection by preventing moisture ingress beneath tiled finishes, thereby extending the durability and performance of the underlying structure.
The kit comprises three integral components designed to work in harmony. SoudaPrim DP acts as a high-quality primer, enhancing the bond between the surface and the membrane. SoudaGum LM, a solvent-free, ready-to-use liquid membrane, forms a continuous and elastic waterproof coating that adapts to surface irregularities and structural movements. SoudaTape ST is used to reinforce vulnerable areas such as corners, junctions, and movement joints, ensuring a fully sealed and secure installation.
SoudaGum LM cures to form a permanently flexible membrane, maintaining its integrity even under dynamic conditions. It can be applied both horizontally and vertically, delivering strong adhesion without the need for complex surface preparation or additional bonding agents. Once cured, it remains resistant to environmental stress and surface movement, preventing cracking or delamination over time. The membrane’s ability to bridge hairline cracks and minor substrate imperfections further enhances its reliability in waterproofing applications.
Designed with efficiency in mind, the SoudaGum LM membrane dries within approximately four hours and can be tiled over after twelve, significantly reducing downtime during installations. This quick curing time allows contractors to accelerate project timelines without compromising performance. The system is capable of withstanding temperature variations between -5°C and +75°C, making it suitable for a wide range of indoor environments, including underfloor heating systems and thermally active substrates.
The SoudaGum LM Tanking Kit is fully compliant with EN 14891:2017, the European standard for liquid-applied waterproofing membranes beneath ceramic tiling. This certification confirms its suitability for professional use in accordance with modern construction and building standards. With a coverage rate of approximately 1.45 kg/m² at a 1 mm thickness, the system offers consistent results and efficient product use across large surface areas.
This solvent-free system not only meets the technical demands of high-moisture environments but also offers a safer and more environmentally responsible alternative to traditional waterproofing products. Its low environmental impact, combined with robust long-term performance, makes the SoudaGum LM Tanking Kit a dependable and sustainable choice for waterproofing applications in bathrooms, wetrooms, and similar installations.
Complete Waterproofing System: The kit includes a primer, membrane, and tanking tape, ensuring all key areas—joints, corners and flat surfaces—are sealed thoroughly to prevent moisture ingress.
Ready-to-Use and Solvent-Free: The waterproofing membrane requires no mixing, making application quick and mess-free. Being solvent-free also means it is safe for indoor environments and reduces health risks during application.
Flexible and Permanently Elastic: SoudaGum LM maintains flexibility even after curing, allowing it to accommodate minor substrate movement without cracking or compromising its waterproofing performance.
Rapid Drying Time: The membrane dries in approximately four hours, allowing for quicker project completion. Tiles can typically be installed just twelve hours after application, reducing overall installation time.
Exceptional Compatibility: Adheres well to commonly used interior surfaces such as concrete, cement render, plasterboard, and more. Compatible with most standard tile adhesives and coverings.
Environmentally Friendly: Formulated to be free of solvents, the system minimises environmental impact and contributes to a safer indoor air environment during and after application.
Wetroom Waterproofing: Designed for sealing the floors and walls of domestic and commercial wetrooms, protecting underlying substrates from water exposure prior to tiling.
Shower and Bathroom Sealing: An ideal solution for use in shower enclosures and bathrooms where frequent water contact requires long-term moisture protection.
Pre-Tiling Surface Protection: SoudaGum LM serves as an essential waterproof layer before applying tiles in moisture-sensitive areas, complying with EN 14891:2017 waterproofing standards.
Interior Substrates Such as Plasterboard and Cement Render: Effectively seals substrates that are particularly vulnerable to moisture damage, ensuring longevity and reducing the risk of damp-related issues.
Joint and Corner Reinforcement: The included SoudaTape ST is embedded in the membrane to reinforce joints, cracks, and transitions—key weak points where water typically infiltrates.
Before commencing application of the Soudal SoudaGum LM Tanking Kit, it is essential to take standard labour hygiene precautions.
Always wear appropriate Personal Protective Equipment (PPE), including gloves and eye protection. Work in a well-ventilated area and avoid skin and eye contact. Refer to the safety data sheet and product label for full health and safety guidelines prior to use.
The SoudaGum LM Tanking Kit is designed for use on most common interior construction surfaces, including concrete, cement-based plasters, gypsum board, cement-lime plasters, OSB boards, brickwork and masonry.
The product is suitable only for stable, load-bearing surfaces which are free from rising damp or continuous immersion in water.
The substrate must be clean, dry or slightly damp, and free from dust, grease, oil, rust, old adhesive residues, or any contaminants that may compromise adhesion. All loose material, old coatings, and friable sections should be removed.
Prime all porous and absorbent surfaces with SoudaPrim DP Primer. Apply the primer directly from the container using a brush or roller and allow it to dry for at least two hours. For highly absorbent substrates, apply a second coat ‘wet-on-wet’.
Once the substrate has been suitably prepared and primed, stir SoudaGum LM thoroughly before application.
The waterproofing membrane should be applied using a roller, brush, trowel or spatula. Application must be carried out in two coats, with the second applied crosswise to the first.
The first layer should be left to dry for approximately three to four hours at 23°C before applying the second coat. Ensure a uniform membrane with a minimum total thickness of 1mm is achieved across the entire surface. Avoid the formation of gaps or pinholes in the coating.
When sealing joints or corners, embed SoudaTape ST into the freshly applied first coat of SoudaGum LM and allow it to dry completely before applying a second layer over it to encapsulate the tape.
The consumption rate of SoudaGum LM is approximately 1.45 kg/m² for a total layer thickness of 1mm, applied in two coats.
Therefore, the 4 kg kit will cover approximately 2.75m² when applied at the recommended thickness.
Coverage may vary depending on the porosity and texture of the substrate, as well as the method of application. For best results, ensure that the surface is even and suitably prepared to allow uniform film formation.
At an ambient temperature of 23°C, each 1mm layer of SoudaGum LM will be touch-dry in approximately four hours.
At lower temperatures (e.g. 5°C), drying time may extend to twelve hours. Wait at least twelve hours after final application before tiling or cladding over the waterproofed surface.
Tools and equipment should be cleaned with clean water or Soudal Swipex Wipes immediately after use. Once cured, the product can only be removed mechanically.
It is important that the membrane is always covered with ceramic tiles or other suitable finishes. SoudaGum LM is not a wearing surface and should not be exposed without protective covering.
Avoid using the product in areas exposed to constant immersion or over expansion joints. On floors, it is advisable to form a slight slope to prevent the accumulation of standing water.
The SoudaGum LM Tanking Kit is compliant with EN 14891:2017 and is specifically formulated for the waterproofing of wet rooms, showers, and bathrooms prior to tiling.
The complete kit includes SoudaGum LM liquid membrane, SoudaPrim DP primer, and SoudaTape ST for reinforcement. Always store the product in a dry place between +5°C and +25°C and protect from frost.
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