Platinum CV8 - Basement Tanking Membrane (8mm Stud)

Substrate Suitability:

Platinum CV8 Cavity Drain Membrane is suitable for a wide range of substrates, particularly those found in below-ground construction, such as concrete, brick, and stone. It is designed to be used in environments where water ingress is a significant concern, including basements, tunnels, and vaults. The membrane can be applied to both walls and floors, provided the substrate is sound, clean, and free from contaminants that could impair adhesion or waterproofing performance.

For new construction projects, it is essential that the concrete slab is laid in strict accordance with BS 8204-1:2003+A1:2009 standards. This ensures a flat and even surface, with deviations of no more than 5mm over a 3000mm straight edge. This precision is crucial to avoid any air gaps that could compromise the effectiveness of the membrane. For existing structures, any unsound plaster, render, or screed should be removed, and the surface should be levelled accordingly. Where necessary, Platinum Fillet Seal or a 3:1 sand:cement mix incorporating Wykamol Renderproof Waterproofing Additive should be used to achieve the required surface standards.

Surface Preparation:

Proper surface preparation is vital to ensure the optimal performance of Platinum CV8 Membrane. Begin by thoroughly cleaning the substrate to remove any loose debris, dust, or surface contamination. In cases where walls are affected by mould or masonry fungi, it is crucial to address these issues before applying the membrane. Use a stiff brush to remove surface contamination, followed by an application of Lignum Pro M50 Biocide in accordance with the relevant Technical Data Sheet. If dry rot (Serpula Lacrymans) is detected, a detailed assessment should be conducted, and further advice should be sought from our Technical Department.

For installations above ground level, it is advisable to alleviate all sources of moisture at the source, where possible. This can be achieved by installing a Damp Proof Course (DPC), such as DampSolve Damp Proof Cream, before applying the CV8 membrane. This preventative measure reduces the potential for damage to masonry and timber, safeguarding the long-term integrity of the structure.

Application Method:

When applying Platinum CV8 membrane, it is essential to follow a precise and methodical approach to ensure a successful installation. Begin by positioning the membrane with the studs facing the wall. Fixing is accomplished using Platinum Waterseal Brick Plugs, which should be inserted into pre-drilled holes at regular intervals of no more than 600mm. This spacing may vary depending on the specific site conditions and the size of the batten or board being installed. To enhance adhesion and prevent lime efflorescence and dusting, it is recommended to apply Wykamol Anti-Lime Sealer to concrete walls and slabs before installing the CV8 membrane.

When drilling holes for the plugs, take care to prevent excessive masonry dust from falling into the cavity, as this could obstruct drainage channels. Insert the chosen plug, ensuring it is fitted with a seal for all underground waterproofing applications, and secure it using a rubber mallet or club hammer. Seal the membrane at the flanges—bands of membrane along the edges where no studs are present—using Platinum Waterseal Tape. Ensure that these flanges run vertically on walls and overlap the preceding width of membrane. For stud-to-stud joints, use Platinum Waterseal Rope to achieve a watertight seal.

When dealing with vaulted ceilings, the membrane can be successfully applied by carefully sealing all mitred joints with Platinum Waterseal Tape, Platinum Waterseal Rope, Platinum Corner Tape, or Platinum Mesh Tape as required. This meticulous approach ensures that even complex structures are fully protected against water ingress.

Conditions & Limitations:

It is important to recognise the conditions and limitations associated with the use of Platinum CV8 membrane. The membrane is not suitable for application to flat soffits below ground level, as these require a minimum slope of 10% to function effectively. When running the membrane around internal and external corners, take extra care to ensure that it is fixed tightly to the angle, creating well-defined edges that facilitate the application of subsequent finishes.

The membrane should not be exposed to direct sunlight for prolonged periods, as UV exposure can degrade the material over time. Additionally, while the membrane can tolerate a wide range of temperatures, it should be stored and installed under conditions that prevent exposure to extreme temperatures and open flames.

Finishing:

Finishing the installation of Platinum CV8 membrane requires careful consideration of the intended final surface. For stud frame construction, Platinum Waterseal Brick Plugs should be applied in a vertical line, aligning with the stud locations and battens. Fix the stud frame to the plugs using No. 10 screws (5mm), taking care not to perforate the membrane. If straight alignment of the plugs is not possible, 'Gyproc' brackets can be used to secure the battens in place.

When finishing floors, the CV8 membrane can be overlaid with closed-cell insulation before laying tongue-and-groove (T&G) flooring. Ensure a 10mm expansion joint is maintained around the perimeter. Alternatively, a conventional sand and cement screed, approximately 65mm thick, can be laid. The specific conditions of the site may dictate variations to this method, and in cases of uncertainty, it is recommended to consult our Technical Department for guidance.

During the application and finishing process, ensure that atmospheric moisture levels do not exceed 70% relative humidity (RH). Impermeable floor finishes should only be applied when the screed moisture content is below 75% RH to avoid compromising the performance of the membrane.

Aftercare:

Platinum CV8 membrane, once installed, provides a long-lasting solution for controlling damp and moisture ingress in below-ground structures. To maintain a dry and habitable environment, particularly in areas lacking natural ventilation, it is crucial to implement adequate condensation control measures.

This is especially important in wet areas such as kitchens and bathrooms. The installation of an effective mechanical ventilation system is recommended to prevent the build-up of condensation, which could otherwise lead to secondary moisture problems. For detailed advice on appropriate ventilation systems, contact our Technical Department.

Storage & Shelf Life:

Platinum CV8 membrane should be stored in an upright position, under cover, and away from sources of high temperatures and open flames. When stored correctly and installed in accordance with the datasheet recommendations, the membrane's shelf life is equivalent to the lifetime of the structure. Proper storage conditions ensure that the membrane retains its performance characteristics and remains effective for the duration of its intended use.

Other Information:

Platinum CV8 Cavity Drain Membrane is an integral component of a comprehensive waterproofing system, designed to protect below-ground structures from water ingress. It is compatible with a range of associated Platinum ancillary products, including Platinum Waterseal Brick Plugs, Platinum Waterseal Tape, Platinum Waterseal Rope, and Platinum AquaTrack Basement Channels. These products work together to create a fully integrated system that offers reliable and long-lasting protection against moisture. 

For projects involving complex structures or where high levels of water ingress are anticipated, it is advisable to consult with our Technical Department to ensure that the correct installation methods and products are used.

Q) What is Platinum CV8 Cavity Drain Membrane, and what is it used for?

A) Platinum CV8 Cavity Drain Membrane is a high-performance waterproofing solution specifically designed for below-ground structures such as basements, tunnels, and vaults. It is made from durable high-density polyethylene (HDPE) and features an 8mm studded profile that creates an air gap between the structure and the membrane, allowing water to drain away efficiently. This design prevents dampness and moisture ingress, ensuring a dry, habitable environment in areas prone to water penetration. The membrane is compliant with BS8102:2009 standards for 'Type C' waterproofing, providing a Grade 3 environment suitable for creating habitable spaces in below-ground applications.

Q) What are the key benefits of using Platinum CV8 Cavity Drain Membrane?

A) The key benefits of using Platinum CV8 Cavity Drain Membrane include superior waterproofing performance, enhanced durability, and ease of installation. The membrane creates an effective air gap that allows water to drain away from the structure, preventing dampness and moisture ingress. It is made from high-density polyethylene (HDPE), which is highly resistant to chemicals, salts, and contaminants, ensuring long-term protection against water ingress. The membrane is lightweight, easy to cut and install, and requires minimal surface preparation, reducing labor time and costs. Additionally, it forms part of a comprehensive waterproofing system when used with Platinum ancillary products, ensuring that interior spaces remain dry and safe.

Q) How does Platinum CV8 Cavity Drain Membrane work to prevent water ingress?

A) Platinum CV8 Cavity Drain Membrane works by creating a studded profile that forms an air gap between the structure and the membrane. This gap allows any water that penetrates the structure to drain away efficiently, preventing dampness and moisture ingress. The membrane is installed with the studs facing the wall or floor, creating a cavity that directs water towards designated drainage points. This design ensures that water is effectively managed and drained away, keeping interior spaces dry and habitable. When combined with associated drainage channels and sump pump systems, the membrane forms a comprehensive waterproofing solution that effectively controls water ingress.

Q) What types of environments is Platinum CV8 Cavity Drain Membrane suitable for?

A) Platinum CV8 Cavity Drain Membrane is suitable for a variety of environments, particularly those found in below-ground construction, such as basements, tunnels, vaults, and other subterranean spaces. It is designed for use in areas where water ingress is a significant concern and where maintaining a dry interior environment is essential. The membrane is suitable for both new construction projects and retrofitting existing structures, providing effective waterproofing in a wide range of environmental conditions. It operates effectively within a temperature range of -50°C to +80°C and can withstand compressive forces up to 180 kN/m², making it ideal for various demanding applications.

Q) What makes Platinum CV8 Cavity Drain Membrane compliant with BS8102:2009 standards?

A) Platinum CV8 Cavity Drain Membrane is compliant with BS8102:2009 standards for 'Type C' waterproofing, which refers to a cavity drainage system designed to manage water ingress in below-ground structures. The membrane creates an air gap that allows water to drain away from the structure, preventing dampness and moisture ingress. This design aligns with the requirements of BS8102:2009 for maintaining a Grade 3 environment, which is suitable for dry, habitable spaces. The membrane's robust construction and effective drainage capabilities ensure reliable protection against water penetration, meeting the stringent standards set out in BS8102:2009.

Q) How is Platinum CV8 Cavity Drain Membrane installed?

A) The installation of Platinum CV8 Cavity Drain Membrane is straightforward and requires minimal surface preparation. The membrane is positioned with the studs facing the wall or floor, creating an air gap for drainage. It is secured using Platinum Waterseal Brick Plugs inserted into pre-drilled holes at regular intervals, typically no more than 600mm apart. The membrane is cut to size with a sharp blade for precise fitting around complex shapes and irregularities. Sealing at the flanges is done using Platinum Waterseal Tape to ensure a watertight seal. For stud-to-stud joints, Platinum Waterseal Rope is used to achieve a secure connection. The membrane can be installed on walls, floors, and vaulted ceilings with appropriate sealing and fixing techniques.

Q) What surfaces can Platinum CV8 Cavity Drain Membrane be applied to?

A) Platinum CV8 Cavity Drain Membrane can be applied to a variety of surfaces commonly found in below-ground construction, including concrete, brick, stone, and masonry. It is designed to be used on both walls and floors, provided that the substrate is sound, clean, and free from contaminants that could impair adhesion or waterproofing performance. For new construction projects, the substrate should be prepared in accordance with BS 8204-1:2003+A1:2009 standards to ensure a flat and even surface. For existing structures, any unsound plaster, render, or screed should be removed, and the surface should be leveled accordingly.

Q) Can Platinum CV8 Cavity Drain Membrane be used for retrofitting older buildings?

A) Yes, Platinum CV8 Cavity Drain Membrane is suitable for retrofitting older buildings where dampness and water ingress are issues. The membrane can be applied to existing structures to provide a modern, effective waterproofing solution that enhances the building's longevity and usability. It creates an air gap that allows water to drain away from the structure, preventing dampness and moisture ingress. The membrane's flexibility and ease of installation make it ideal for retrofitting applications, providing a reliable and long-term solution for improving the waterproofing performance of older buildings.

Q) What associated products can be used with Platinum CV8 Cavity Drain Membrane?

A) Several associated products can be used with Platinum CV8 Cavity Drain Membrane to form a comprehensive waterproofing system. These include Platinum Waterseal Brick Plugs for fixing the membrane to the substrate, Platinum Waterseal Membrane Tape for creating a waterproof seal at membrane overlaps, and Platinum Waterseal Rope for sealing around plug necks if not using the sealing washers. Platinum Corner Tape can be used to link waterproof membranes at floor-to-wall joints. For controlling efflorescence, Wykamol Anti Lime Sealer should be applied to concrete surfaces before membrane installation. Additionally, Platinum AquaTrack Basement Drainage Channel and Platinum AquaSump Basement Sump & Pump Systems are used to manage water ingress and ensure effective drainage.

Q) How does Platinum CV8 Cavity Drain Membrane contribute to a comprehensive waterproofing system?

A) Platinum CV8 Cavity Drain Membrane contributes to a comprehensive waterproofing system by creating a barrier that prevents water ingress and allows for effective drainage. When used with Platinum ancillary products such as drainage channels and sump pump systems, the membrane forms part of an integrated solution that manages water ingress from below-ground structures. The drainage channels collect water that penetrates the structure and direct it towards designated sump pump stations, where it is safely removed from the interior environment. This system ensures that below-ground spaces remain dry and habitable, providing long-term protection against moisture and water-related damage.

Q) What is the life expectancy of Platinum CV8 Cavity Drain Membrane?

A) The life expectancy of Platinum CV8 Cavity Drain Membrane is equivalent to the design life of the structure in which it is installed. This means that the membrane is expected to provide effective waterproofing protection for the entire lifespan of the building or structure. The use of durable high-density polyethylene (HDPE) ensures that the membrane remains resistant to degradation over time, even in challenging environmental conditions. Proper installation and maintenance further enhance the membrane's longevity, ensuring reliable performance throughout its intended use.

Q) What is the compressive strength of Platinum CV8 Cavity Drain Membrane, and why is it important? 

A) The compressive strength of Platinum CV8 Cavity Drain Membrane is 180 kN/m², as per BS EN ISO 25619-2 standards. This high compressive strength is important because it ensures the membrane can withstand significant pressure without deforming or losing its waterproofing capabilities. In below-ground applications, the membrane may be subjected to considerable forces from soil, groundwater, and structural loads. The ability to maintain its integrity under these conditions is crucial for ensuring long-term waterproofing performance and the structural stability of the protected area.

Q) Can Platinum CV8 Cavity Drain Membrane be used in conjunction with insulation materials?

A) Yes, Platinum CV8 Cavity Drain Membrane can be used in conjunction with insulation materials to enhance the thermal performance of below-ground spaces. After installing the membrane, closed-cell insulation can be overlaid before applying the final flooring. This combination provides both waterproofing and thermal insulation, making below-ground spaces more comfortable and energy-efficient. The use of insulation materials should be planned carefully to ensure that the waterproofing performance of the membrane is not compromised.

Q) How does Platinum CV8 Cavity Drain Membrane handle efflorescence in concrete surfaces?

A) To handle efflorescence in concrete surfaces, it is recommended to use Wykamol Anti Lime Sealer in conjunction with Platinum CV8 Cavity Drain Membrane. Efflorescence occurs when water-soluble salts are transported to the surface of the concrete, leaving a white deposit as the water evaporates. Wykamol Anti Lime Sealer is applied to concrete surfaces before installing the membrane to prevent the leaching of free lime from the concrete, which helps control primary and secondary efflorescence. This process ensures a clean and effective bonding surface for the membrane, enhancing its performance and longevity.

Q) What are the fire safety standards for Platinum CV8 Cavity Drain Membrane?

A) Platinum CV8 Cavity Drain Membrane is classified as Class E under BS EN 13501-1:2007+A1:2009 for fire safety. This classification indicates that the membrane has a normal level of reaction to fire, suitable for use in various below-ground applications where fire safety is a consideration. While the membrane itself is not highly flammable, it is important to ensure that it is not exposed to open flames or high temperatures during storage and installation to maintain its integrity and performance.

Q) What is the temperature range within which Platinum CV8 Cavity Drain Membrane can operate effectively? 

A) Platinum CV8 Cavity Drain Membrane can operate effectively within a wide temperature range from -50°C to +80°C. This broad range ensures that the membrane remains flexible and maintains its waterproofing performance under various environmental conditions, including extreme cold and heat. The ability to function across such a wide temperature spectrum makes the membrane suitable for use in diverse geographic locations and climates, from cold, damp basements in temperate regions to hot, humid tunnels in tropical environments.

Q) How is Platinum CV8 Cavity Drain Membrane fixed to the substrate?

A) Platinum CV8 Cavity Drain Membrane is fixed to the substrate using Platinum Waterseal Brick Plugs, which are inserted into pre-drilled holes at regular intervals, typically no more than 600mm apart. The plugs are driven into the wall or floor using a rubber mallet or club hammer to secure the membrane firmly in place. A seal is fitted to each plug to ensure a watertight installation. For additional security, the membrane edges (flanges) are sealed using Platinum Waterseal Tape, and for stud-to-stud joints, Platinum Waterseal Rope is used to achieve a watertight seal.

Q) Can Platinum CV8 Cavity Drain Membrane be exposed to direct sunlight?

A) No, Platinum CV8 Cavity Drain Membrane should not be exposed to direct sunlight for prolonged periods, as ultraviolet (UV) exposure can degrade the material over time. HDPE, while durable, is susceptible to UV radiation, which can weaken the membrane and reduce its effectiveness as a waterproofing solution. It is recommended to store the membrane under cover and install it away from direct sunlight exposure. If temporary exposure to sunlight is unavoidable during installation, it should be minimised to protect the integrity of the membrane.

Q) What should be done if mould or fungi are present on the substrate before installing Platinum CV8 Cavity Drain Membrane?

A) If mould or fungi are present on the substrate, it is essential to address these issues before installing Platinum CV8 Cavity Drain Membrane. Begin by using a stiff brush to remove surface contamination. Follow this by applying a biocide treatment, such as Lignum Pro M50 Biocide, according to the relevant Technical Data Sheet. This step ensures that any remaining spores are neutralised, preventing future growth under the membrane. If dry rot (Serpula Lacrymans) is detected, a detailed assessment should be conducted, and further advice should be sought from technical experts to determine the appropriate course of action.

Q) Can Platinum CV8 Cavity Drain Membrane be used on flat soffits below ground level?

A) No, Platinum CV8 Cavity Drain Membrane is not suitable for use on flat soffits below ground level. The membrane requires a minimum slope of 10% to function effectively and allow water to drain away properly. Flat soffits do not provide the necessary gradient for efficient drainage, which could compromise the membrane's performance and lead to water accumulation.

Q) How should Platinum CV8 Cavity Drain Membrane be stored to maintain its effectiveness?

A) Platinum CV8 Cavity Drain Membrane should be stored in an upright position, under cover, and away from sources of high temperatures and open flames. Proper storage conditions are essential to maintain the membrane's performance characteristics and ensure its longevity. The membrane should be protected from direct sunlight and stored in a cool, dry place. When stored correctly and installed in accordance with datasheet recommendations, the membrane's shelf life is equivalent to the lifetime of the structure.

Q) Can Platinum CV8 Cavity Drain Membrane be used for new construction projects?

A) Yes, Platinum CV8 Cavity Drain Membrane is suitable for use in new construction projects. It is an essential component in ensuring that below-ground structures, such as basements and tunnels, are properly waterproofed from the outset. The membrane can be integrated into the construction process to provide long-term protection against water ingress and related issues. Its ease of installation, compatibility with other waterproofing products, and compliance with industry standards make it ideal for new builds requiring reliable and effective waterproofing solutions.

Q) How does Platinum CV8 Cavity Drain Membrane perform in high groundwater conditions?

A) Platinum CV8 Cavity Drain Membrane performs effectively in high groundwater conditions by providing a robust barrier against water ingress and allowing for efficient drainage of water that penetrates the structure. The membrane's studded profile creates an air gap that channels water towards designated drainage points, such as sump pump systems or natural drainage outlets. This design ensures that water is managed effectively, preventing accumulation and keeping below-ground spaces dry and habitable. When used in conjunction with a comprehensive waterproofing system, the membrane provides reliable protection even in challenging groundwater conditions.

Q) Can Platinum CV8 Cavity Drain Membrane be installed on vaulted ceilings?

A) Yes, Platinum CV8 Cavity Drain Membrane can be installed on vaulted ceilings, provided that all mitred joints are carefully sealed with appropriate sealing products such as Platinum Waterseal Tape, Platinum Waterseal Rope, Platinum Corner Tape, or Platinum Mesh Tape. This meticulous sealing ensures that the membrane provides continuous protection against water ingress even in complex structural configurations. Proper installation on vaulted ceilings requires attention to detail to ensure that all joints are adequately sealed and the membrane is securely fixed to prevent water penetration.

Q) What is the tensile strength of Platinum CV8 Cavity Drain Membrane?

A) The tensile strength of Platinum CV8 Cavity Drain Membrane is 416 N in the machine direction (MD) and 488 N in the cross direction (CD), as per BS 12311-2 standards. This high tensile strength indicates the membrane's ability to withstand stretching and pulling forces without breaking, ensuring its durability and reliability in waterproofing applications. The robust construction of the membrane allows it to maintain its integrity even under significant stress, making it suitable for various below-ground environments.

Q) What precautions should be taken when drilling holes for Platinum Waterseal Brick Plugs during installation?

A) When drilling holes for Platinum Waterseal Brick Plugs during installation, care should be taken to prevent excessive masonry dust from falling into the cavity, as this could obstruct drainage channels and affect the membrane's performance. It is recommended to use a dust extraction system or take other measures to control dust during drilling. Additionally, ensure that holes are drilled at regular intervals, no more than 600mm apart, to provide adequate support for the membrane. After drilling, the plugs should be inserted and secured with a rubber mallet or club hammer to ensure a tight fit and effective waterproofing.

Q) How does Platinum CV8 Cavity Drain Membrane handle high compressive forces?

A) Platinum CV8 Cavity Drain Membrane is designed to handle high compressive forces, with a compressive strength of 180 kN/m², as per BS EN ISO 25619-2 standards. This high compressive strength ensures that the membrane can withstand significant loads from soil, groundwater, and structural elements without deforming or losing its waterproofing capabilities. The membrane's robust construction provides structural stability and ensures long-term protection against water ingress, even under challenging conditions.

Q) What are the finishing options after installing Platinum CV8 Cavity Drain Membrane?

A) After installing Platinum CV8 Cavity Drain Membrane, several finishing options are available depending on the intended final surface. For stud frame construction, the membrane can be secured using Platinum Waterseal Brick Plugs in a vertical line, aligning with stud locations. No. 10 screws (5mm) are used to fix the stud frame to the plugs. If necessary, 'Gyproc' brackets can be used for additional support. For floors, the membrane can be overlaid with closed-cell insulation before laying tongue-and-groove (T&G) flooring or covered with a conventional sand and cement screed. A 10mm expansion joint should be maintained around the perimeter to accommodate movement.

Q) How does Platinum CV8 Cavity Drain Membrane maintain a dry environment in below-ground spaces?

A) Platinum CV8 Cavity Drain Membrane maintains a dry environment in below-ground spaces by creating an air gap that allows water to drain away from the structure. The membrane's studded profile prevents water ingress and directs any penetrating water towards designated drainage points, such as sump pump systems or natural drainage outlets. This efficient drainage system ensures that water is managed effectively, preventing accumulation and keeping below-ground spaces dry and habitable. The membrane's robust construction and chemical resistance further enhance its ability to maintain a dry environment over the long term.

Q) What aftercare is required for Platinum CV8 Cavity Drain Membrane after installation?:

A) After installing Platinum CV8 Cavity Drain Membrane, minimal aftercare is required to maintain its effectiveness. It is essential to implement adequate condensation control measures, particularly in areas lacking natural ventilation, such as kitchens and bathrooms. An effective mechanical ventilation system should be installed to prevent the build-up of condensation, which could lead to secondary moisture problems. Regular inspections should be conducted to ensure that drainage channels and sump pump systems are functioning correctly and that no obstructions or blockages are present. Proper maintenance of associated waterproofing components will help ensure the long-term performance of the membrane.

Technical Data Sheet

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