Wykamol RenderProof Render Additive & Waterproofer

RenderProof is an advanced waterproofing and plasticising cement render additive, specifically designed to enhance the waterproofing capabilities of cement renders used in both internal and external applications.

Approved by the British Board of Agrément (BBA), RenderProof effectively minimises the penetration of liquid water through cement renders, preventing the transfer of harmful salts to the surface.

Its unique formulation is ideal for use following the insertion of a damp proof course (DPC), with a highly concentrated mix ratio that ensures extensive coverage and superior performance in safeguarding masonry against water ingress and salt damage.


Size

Size
Sale price £8.95 Regular price
ex. VAT
Regular price £10.74 £10.74 Sale price Regular price £0.00
inc. VAT

RenderProof is an advanced waterproofing and plasticising cement render additive, specifically designed to enhance the waterproofing capabilities of cement renders used in both internal and external applications.

Approved by the British Board of Agrément (BBA), RenderProof effectively minimises the penetration of liquid water through cement renders, preventing the transfer of harmful salts to the surface.

Its unique formulation is ideal for use following the insertion of a damp proof course (DPC), with a highly concentrated mix ratio that ensures extensive coverage and superior performance in safeguarding masonry against water ingress and salt damage.


Free Delivery

on orders over £100
(ex. VAT, mainland UK only)

Free Help & Advice

Call 01355 222 777
Mon.-Fri 8:30am - 4:15pm, or email us

Next Day Delivery

Order Before 2:30pm for Same Day Despatch (terms apply)

Great Service

A proudly independent family business with 40 years experience

Key Features of Wykamol Renderproof

✔️ BBA Approved for guaranteed quality, effectiveness, and suitability in waterproofing applications.

✔️ Highly concentrated formula provides extensive coverage, treating large areas cost-effectively.

✔️ Waterproofs and plasticises cement renders, improving adhesion and workability for a superior finish.

✔️ Allows walls to breathe, preventing moisture accumulation and protecting against damp and condensation.

✔️ Blocks passage of residual ground salts, safeguarding plaster finishes from damage and maintaining aesthetics.

 

Full Product Description

RenderProof offers a comprehensive solution for the waterproofing needs of new and existing buildings, acting as a critical defence layer against moisture and salt penetration. This BBA-approved additive is designed to be mixed with a 3:1 sand and cement mixture, using salt-free washed sand to ensure the highest quality of render. The formula's unique composition not only waterproofs the render but also acts as a plasticiser, improving workability and adhesion to create a durable, long-lasting protective coat.

The effectiveness of RenderProof lies in its ability to reduce the pore size within the render, significantly hindering the passage of water while allowing the walls to breathe. This vapour permeability is crucial for the health of the building's structure, ensuring that trapped moisture can escape, thereby preventing potential damage from condensation.

With a mixing ratio of 1 part RenderProof to 24 parts water, a single 5 litre container can treat up to 120 litres of gauging water, blending seamlessly with dry sand and 250kg of cement. This concentration allows for the coverage of large areas in a single application, making it a cost-effective and time-saving option for professionals and DIY enthusiasts alike.

RenderProof is suitable for use after the application of various DPC treatments, including Ultracure DPC Cream, DampSolve DPC Cream, DampSolve-40 DPC Cream, and Microtech PIF Pressure Injection Fluid. Its application ensures that residual ground salts, which can be detrimental to plaster finishes, are effectively barred from passing through, preserving the integrity and appearance of the render.

 

Product Benefits:

  • BBA Approved: RenderProof's certification by the British Board of Agrément guarantees its quality, effectiveness, and suitability for waterproofing applications, offering peace of mind to users.

  • Versatility: Suitable for both internal and external renders, RenderProof can be used on all types of masonry, providing a flexible solution for various building projects.

  • High Concentration: The highly concentrated formula ensures extensive coverage, allowing for the treatment of large areas with minimal product, making it a cost-efficient option.

  • Waterproofing and Plasticising: By reducing pore size and improving workability, RenderProof not only prevents water ingress but also enhances the render's adhesion and finish.

  • Vapour Permeability: Its ability to allow walls to breathe prevents moisture accumulation within the structure, protecting against damp and condensation-related issues.

  • Prevents Salt Damage: RenderProof blocks the passage of residual ground salts, safeguarding plaster finishes from potential harm and maintaining the aesthetic quality of the render.

 

Typical Applications:

  • Post-Damp Proof Course Renders: Ideal for use in rendering applications following the installation of a DPC, ensuring that the newly treated walls are protected against moisture and salt penetration.

  • External Renders: RenderProof's waterproofing properties make it perfect for external renders, providing a robust defence against environmental moisture.

  • Internal Renovations and Repairs: In internal settings, especially in areas prone to damp, RenderProof enhances the render's resistance to moisture, preserving the integrity of internal walls.

  • Historical Building Restoration: For buildings of historical significance where preservation of original materials is essential, RenderProof offers a sympathetic yet effective solution to prevent water and salt damage without compromising the building's breathability.

Substrate Suitability:

Wykamol Renderproof is designed for use on all types of masonry substrates, both internal and external, following the insertion of a damp proof course.

Its formulation makes it suitable for enhancing the waterproof properties of cement renders, preventing water ingress and salt damage.

 

Surface Preparation:

Proper preparation of the masonry substrate is essential for the effective application of Wykamol Renderproof.

Begin by raking out masonry joints and thoroughly cleaning surfaces to remove dust, friable material, and all traces of previous plaster.

Remove any organic matter, including timber fixings, and prepare fixing points as necessary.

High suction surfaces should be thoroughly wetted or primed with SBR Bonding Agent to provide a mechanical key or reduce suction.

For substrates with high levels of salt contamination, pre-treatment with Wykamol Salt Neutraliser is recommended.

 

Mixing:

Backing Coat

Prepare a mix of 3 parts by volume of washed, sharp, suitably graded sand to 1 part of Ordinary Portland Cement, according to BS EN 197-1:2011.

Gauge with potable water containing 1 part Renderproof to 24 parts water. Ensure the water is clean and free from organic matter.

The quantity of gauging water should be the minimum consistent with workable application.

 

Mixing:

Float Coat

Prepare a mix of 4 parts volume of washed, sharp sand to 1 part by volume of Ordinary Portland Cement.

Use 1 litre of RenderProof per 24 litres of gauging water, proportionally increasing based on the cement quantity.

Pack Size Gauging Water
5 Litre 120 Litres of gauging water in dry sand per 250Kg of cement
25 Litre 600 Litres of gauging water in dry sand per 1250Kg of cement


 

Application Methods:

Backing Coat

The backing coat should be applied to a uniform thickness of 10-12 mm, extending a minimum of 50 mm above the solid floor level without intersecting the damp-proof course.

To prevent future issues, ensure that no plaster or debris falls into the gap between the wall and any suspended flooring.

As the backing coat begins to set, scratch the surface to create a mechanical key for the subsequent float coat.

 

Float Coat

The float coat is applied over the same area as the backing coat to a slightly thinner thickness of 8-10mm.

This coat further enhances the wall's waterproofing and prepares the surface for any finishing layers.

 

Subsequent Coats

Limit application to no more than two plaster coats in one continuous working process. For greater thickness, allow the initial coats to cure for 7-14 days, applying SBR Bonding Agent as a primer before adding additional coats.

 

Limitations:

It's essential to note that RenderProof is incompatible with Gypsum-based plasters and should not be incorporated into lime-based or low cement content mixes.

These limitations are critical to maintaining the integrity of the waterproof render system.

 

Curing:

After applying the float coat, a minimum curing period of 24 hours is required under ideal conditions. This time allows the render to achieve sufficient hardness and begin the waterproofing process effectively.

 

Finishing:

To complete the waterproofing system, a finishing coat of Wykamol High Impact Finish should be applied. This not only provides a visually appealing surface but also adds an additional layer of protection against the elements.

 

Decoration:

Decoration, particularly the initial layer, should be postponed as long as feasibly possible and should not commence within 14 days of applying the final plaster coat.

Early decorations should opt for vapour permeable finishes to allow the walls to continue drying out effectively.

Impermeable finishes, like oil paints or wallpapers, should be delayed for at least 12 months, ensuring the wall has adequately dried.

For walls with greater thickness, this drying period may extend significantly and will vary based on environmental conditions and the building's heating levels.

 

Cleaning:

Ensuring that all tools are promptly cleaned with water after use maintains their condition for future projects and prevents the hardening of residual render or additive, which could compromise future applications.

Q) What is Wykamol Renderproof?

A) Wykamol Renderproof is a premium cement render additive designed to enhance the waterproofing capabilities and workability of cement renders. Approved by the British Board of Agrément (BBA), it serves to significantly reduce the penetration of water through renders by minimizing pore size, thereby preventing the transfer of harmful salts to the render surface. Its formulation is optimized for use in both internal and external applications, following the installation of a damp-proof course (DPC), making it an essential component in waterproofing and salt damage prevention efforts in new and existing buildings.

 

Q) How does Renderproof work?

A) Renderproof works by altering the physical properties of the render mix. It acts as both a waterproofing agent and a plasticiser. By reducing the pore size within the cement render, it minimizes water ingress through capillary action, effectively blocking the passage of moisture. At the same time, it enhances the render's workability, making it easier to apply while improving adhesion to the substrate, creating a durable, long-lasting protective coat that is vapour permeable. This allows the walls to 'breathe', preventing trapped moisture and the potential damage it could cause.

 

Q) Is Renderproof suitable for all types of masonry?

A) Yes, Renderproof is designed for compatibility with all types of masonry substrates. Its versatility ensures that it can be used effectively on a wide range of building materials, including brick, stone, and concrete, making it a flexible solution for various waterproofing projects. Whether applied internally or externally, Renderproof can enhance the durability and moisture resistance of cement renders across different masonry types.

 

Q) Can Renderproof be used for both internal and external renders?

A) Absolutely. Renderproof's formulation is ideal for enhancing the waterproofing properties of cement renders in both internal and external applications. Its effectiveness in preventing water ingress and salt damage, along with its vapour permeability, makes it a robust defence against environmental moisture and damp issues within buildings. This dual capability ensures that Renderproof is a comprehensive solution for rendering projects regardless of their location.

 

Q) What is the mixing ratio for Renderproof?

A) The recommended mixing ratio for Renderproof is 1 part Renderproof to 24 parts water. This highly concentrated mix ratio is designed to ensure that a single 5-litre container of Renderproof can treat up to 120 litres of gauging water, blending seamlessly with the sand and cement mix for extensive coverage. This concentration allows for significant areas to be covered in a single application, providing a cost-effective and efficient waterproofing solution.

 

Q) How should Renderproof be mixed for the backing coat?

A) For the backing coat, prepare a mix of 3 parts by volume of washed, sharp, suitably graded sand to 1 part of Ordinary Portland Cement (OPC), gauged with potable water containing 1 part Renderproof to 24 parts water. It's crucial that the water used is clean and free from organic matter to ensure the integrity of the mix. This mixture should adhere to the minimum water content principle, consistent with workable application, to maintain the render's structural and waterproofing properties.

 

Q) What preparation is required for the masonry substrate before applying Renderproof?

A) Proper substrate preparation is critical for effective application of Renderproof. Begin by raking out masonry joints to remove loose mortar and thoroughly cleaning the surfaces to eliminate dust, debris, and any previous plaster. Organic matter, including timber fixings, must be removed, and fixing points prepared as necessary. High suction surfaces should be either wetted or primed with an SBR Bonding Agent to regulate absorption or provide a mechanical key. In cases of high salt contamination, a treatment with Wykamol Salt Neutraliser is recommended prior to Renderproof application.

 

Q) Can Renderproof be used after a damp-proof course has been installed?

A) Yes, Renderproof is specifically designed for use following the insertion of a damp-proof course (DPC). It complements DPC treatments like Ultracure DPC Cream, DampSolve DPC Cream, DampSolve-40 DPC Cream, and Microtech PIF Pressure Injection Fluid, by providing an additional barrier against moisture and salt penetration. Its application ensures the longevity and effectiveness of the DPC, safeguarding the building's structure from water ingress and associated damage.

 

Q) What are the benefits of using Renderproof in my rendering project?

A) Renderproof offers numerous benefits, making it a valuable addition to any rendering project:

  • BBA Approval: Assurance of quality, effectiveness, and suitability for waterproofing applications.
  • Versatility: Suitable for a range of masonry types and both internal and external applications.
  • High Concentration: Extensive coverage with minimal product use, offering cost and time efficiency.
  • Waterproofing and Plasticising: Improves the waterproofing properties of renders while enhancing workability and adhesion, resulting in a durable and long-lasting protective coat.
  • Vapour Permeability: Allows walls to breathe, preventing moisture accumulation and protecting against damp and condensation.
  • Prevents Salt Damage: Effectively blocks the passage of residual ground salts, preserving the integrity and appearance of the render.

 

Q) How is Renderproof applied in the backing coat?

A) The backing coat application involves applying the Renderproof-enhanced plaster mix to a uniform thickness of 10-12 mm. Care must be taken to extend the coat at least 50 mm above the solid floor level without intersecting or bridging the damp-proof course. As the backing coat begins to set, the surface should be scratched to create a mechanical key for the subsequent float coat, ensuring strong adhesion and a cohesive render system.

 

Q) What are the limitations of using Renderproof?

A) While Renderproof is highly versatile, it does have limitations to ensure its effectiveness:

  • It should not be mixed with gypsum-based plasters or used in lime-based or low cement content mixes, as these combinations can compromise the render's structural integrity and waterproofing properties.
  • The precise mixing ratio of 1 part RenderProof to 24 parts water must be adhered to, ensuring the optimal balance between waterproofing effectiveness and workability.

 

Q) What curing time is required after applying Renderproof?

A) After applying the float coat containing Renderproof, a minimum curing period of 24 hours must be allowed under ideal conditions. This curing time is essential for the render to achieve sufficient hardness and begin the waterproofing process effectively, ensuring a durable and long-lasting finish.

 

Q) Can Renderproof be used in historical building restoration?

A) Yes, Renderproof is particularly suitable for historical building restoration projects. Its vapour permeable properties ensure that the building can breathe, preventing trapped moisture – a critical factor in preserving the integrity of older materials. Additionally, its ability to prevent salt damage without compromising the building's breathability makes it an effective solution for safeguarding historical structures against water ingress and salt penetration.

 

Q) How should tools be cleaned after using Renderproof?

A) Tools used in the mixing and application of Renderproof should be cleaned with water immediately after use. Prompt cleaning prevents the hardening of residual render or additive on the tools, ensuring their longevity and readiness for future projects. Regular cleaning also helps maintain the quality of application in subsequent uses.

 

Q) Is Renderproof suitable for DIY projects?

A) Absolutely. Renderproof's ease of use, combined with its comprehensive instructions for mixing and application, makes it an ideal choice for DIY enthusiasts. Its effectiveness in enhancing the waterproofing properties of cement renders, along with its plasticising benefits, provides DIY projects with professional-quality results, ensuring durable and long-lasting protection against moisture and salts.

 

Q) How does Renderproof contribute to the longevity of a building?

A) Renderproof plays a crucial role in extending the lifespan of a building by providing an effective barrier against water ingress and salt damage. By enhancing the waterproofing capabilities of cement renders and preventing the transfer of harmful salts to the surface, it protects the structural integrity of masonry, reducing the risk of moisture-related damage such as damp, efflorescence, and salt crystallisation. This protective layer ensures that buildings remain dry, healthy, and structurally sound over time.

 

Q) What makes Renderproof different from other waterproofing additives?

A) Renderproof distinguishes itself from other waterproofing additives through its BBA approval, high concentration for extensive coverage, and dual functionality as both a waterproofing agent and a plasticiser. Its specific formulation allows for vapour permeability, ensuring that treated walls can breathe, a critical feature for the health of the building's structure. Additionally, its proven effectiveness in preventing salt damage further solidifies its position as a superior choice in the market for waterproofing cement renders.

 

Q) Can Renderproof be used on all types of masonry?

A) Yes, Renderproof is formulated for use on all types of masonry substrates, including brick, stone, and concrete. Its versatile nature makes it a suitable additive for enhancing the waterproof properties of cement renders applied to various building materials, providing flexibility in its application across different types of construction projects.

 

Q) How does the use of Renderproof affect the finishing coat?

A) The use of Renderproof in the render mix does not adversely affect the finishing coat. Instead, it improves the adhesion and workability of the render, ensuring a smoother application and a more uniform finish. For optimal results, a finishing coat of Wykamol High Impact Finish is recommended to complete the waterproofing system, providing an aesthetically pleasing surface that is also robust and durable.

 

Q) What should be considered for decoration after applying Renderproof?

A) When considering decoration after applying Renderproof, it's crucial to allow sufficient drying time for the renders. Initial decoration should be postponed as long as possible, ideally not within 14 days of applying the final plaster coat. Early decorations should utilize vapour permeable finishes, like breathable paints, to ensure the walls continue drying out effectively. Impermeable finishes, such as wallpapers and oil-based paints, should be delayed for at least 12 months to ensure the wall has adequately dried. For thicker walls, this drying period may extend significantly, influenced by environmental conditions and the building's heating levels. The use of impermeable decorative finishes should only be considered once the walls have fully dried out to prevent trapping moisture within the structure.

Q) How does Renderproof impact the environment?

A) Renderproof is designed with consideration for its environmental impact. As a water-based additive, it is less harmful to the environment compared to solvent-based alternatives. By improving the longevity and durability of renders, it contributes to the sustainability of buildings by reducing the need for frequent repairs and maintenance, thereby minimizing waste and resource consumption over time.

 

Q) Is there a specific temperature range for applying Renderproof?

A) While there isn't a strict temperature range specified for applying Renderproof, it's generally advisable to apply it in mild weather conditions to ensure optimal curing and performance. Extremely hot or cold temperatures can affect the drying time and effectiveness of the waterproofing properties. Ideal conditions would be dry, overcast days with temperatures ranging from 5°C to 25°C to avoid rapid drying or freezing of the render before it has fully cured.

 

Q) How does Renderproof's vapour permeability benefit a building?

A) Renderproof's vapour permeability is a significant benefit as it allows moisture within the walls to evaporate, preventing the accumulation of trapped moisture which can lead to damp issues and structural damage over time. This feature is particularly important in maintaining the health of the building's structure by allowing the walls to 'breathe', thus avoiding the problems associated with condensation and promoting a healthier indoor environment.

 

Q) Can Renderproof be used in conjunction with insulation systems?

A) Renderproof can be used in conjunction with external wall insulation systems, providing an additional layer of moisture protection. Its waterproofing properties complement insulation systems by preventing water ingress, which can reduce the insulation's effectiveness and lead to moisture-related damage. However, it's essential to consult with a professional to ensure compatibility and adherence to building regulations.

 

Q) How long does Renderproof last once applied?

A) Renderproof is designed to provide long-lasting waterproof protection when correctly mixed and applied according to the manufacturer's instructions. While the exact lifespan can vary depending on environmental conditions and the quality of application, Renderproof-treated renders can maintain their waterproofing properties for many years, contributing to the durability and longevity of the building's structure.

 

Q) Are there any special considerations for using Renderproof in coastal areas?

A) In coastal areas, where buildings are exposed to higher levels of salt and moisture, Renderproof's salt-blocking and waterproofing properties are particularly beneficial. It's crucial to ensure thorough substrate preparation, including the treatment of high salt levels with Wykamol Salt Neutraliser if necessary, to maximize the effectiveness of Renderproof in these challenging environments.

 

Q) Can Renderproof be used on new construction projects?

A) Absolutely. Renderproof is an excellent addition to new construction projects, providing an effective waterproof barrier from the outset. Its use in new builds can help prevent future damp and salt damage, ensuring the longevity and integrity of the structure, and providing a solid foundation for internal finishes and decorations.

 

Q) What happens if Renderproof is applied too thickly?

A) Applying Renderproof too thickly can lead to issues such as extended drying times, decreased effectiveness of the waterproofing properties, and potential cracking due to uneven curing rates. It's essential to follow the recommended application thickness and guidelines to ensure the render performs as intended without compromising its structural integrity or aesthetic finish.

 

Q) How should Renderproof-treated surfaces be maintained?

A) Surfaces treated with Renderproof require minimal maintenance due to their enhanced durability and resistance to moisture. Regular inspections to check for any signs of damage or wear and prompt repairs if necessary will help maintain the waterproofing effectiveness. Cleaning the surfaces with gentle methods can remove dirt and debris without damaging the render, ensuring the building remains visually appealing and structurally sound for years to come. Proper maintenance and care extend the life of the Renderproof application, ensuring it continues to protect the building against water ingress and salt damage effectively. It's advisable to avoid harsh chemical cleaners or abrasive methods that could compromise the render's integrity. For any significant repairs or reapplication needs, consulting with a professional to ensure compatibility and adherence to the original application guidelines is essential. This proactive approach to maintenance will keep the building's exterior in optimal condition, safeguarding against potential moisture-related issues and preserving its aesthetic appeal.