WEPLUS VAPOUR RELEASE SYSTEM

WestWood Liquid Technologies Limited · 16 Great Queen Street · London WC2B 5AH · United Kingdom Fon: +44 800 8085 480 · [email protected] · www.westwood.eu

Application guideline

Weplus Vapour Release System

Brief description The Weplus Vapour Release System is based on the Weplus 251 Vapour Release Mesh and high-‐quality WestWood PMMA resins. It is specifically designed for the refurbishment of mineral substrates. The system offers a reliable method for removing the moisture enclosed in the substrate by means of a cavity system. Since they are applied as a liquid, the system components create a seamless waterproofing layer that can safely integrate even the most complex details. The system is also weather-‐resistant, crack-‐bridging, flexible at low temperatures and its surface can be finished in any desired colour.

Properties and advantages -‐ Refurbishment of concrete substrates -‐ Decoupling and stress relief between the substrate and the build-‐up -‐ A fully functioning waterproofing system is produced in conjunction

with other, subsequently applied system components -‐ Improved solid-‐borne sound insulation -‐ Existing layers do not have to be removed completely -‐ Reduced build-‐up height (complete build-‐up approx. 8 mm) -‐ Water vapour generated is reliably removed -‐ Rapid completion -‐ High compressive strength

Areas of application The Weplus Vapour Release System is applied to mineral substrates. It is

used to avoid problems associated with vapour pressure and moisture, such as blistering or osmotic damage in the surfacing / waterproofing. Complete removal of the existing mineral substructure can be avoided. The load-‐bearing system is used predominantly for balconies and terraces.

Application conditions

Temperatures Application can generally be carried out within an ambient temperature range between +3 °C and +35 °C. Many products are also suitable for application at sub-‐zero temperatures. Please refer to the table below for exact details. Temperature range, in °C Vapour release layer Air Substrate* Material Wecryl 298 +3 to +35 +3 to +50* +3 to +30 Weplus 251 Vapour Release Mesh +3 to +35 +3 to +50* +3 to +30 Temperature range, in °C Waterproofing layer Air Substrate* Material Wecryl 230 -‐5 to +35 +3 to +50* +3 to +30 Wecryl 230 thix -‐5 to +35 +3 to +50* +3 to +30 Wecryl 230 TT -‐15 to +25 -‐10 to +30* +3 to +20




Temperature range, in °C Protective layer Air Substrate* Material Wecryl 233/ -‐thix 10 /-‐thix 20 +3 to +35 +3 to +50* +3 to +30 Wecryl 233 Wi -‐5 to +30* -‐5 to +30* +3 to +20 Wearing layer Wecryl 220 -‐5 to +35 +3 to +40* +3 to +30 Wecryl 288 -‐5 to +35* +3 to +40* +3 to +30 * The substrate temperature must be at least 3 °C above the dew point during application and curing. The substrate temperature must not be less than +3 °C if a topping is applied to the surface. Reaction problems can occur at lower temperatures.

Humidity and moisture The relative humidity must be ≤ 90 %. The surface to be coated must be dry and ice-‐free. The surface must be protected from moisture until the coating has hardened.

Consumption and reaction times Consumption [kg/m²] Primer layer

Substrate -‐ Smooth

Fine-‐sandy

Rough

Wecryl 298 approx. 0.6 – 0.8

approx. 0.7 – 0.9 approx. 0.8 – 1.0

Waterproofing layer Detail waterproofing and areas around Vapour Release Mesh butt joints

Weplus 251 Vapour Release Mesh

-‐ -‐ -‐

Wecryl 230/-‐thix at least 2.5 -‐ -‐ Wecryl 230 TT at least 2.5 -‐ -‐ Weplus Fleece 15 cm wide

fleece -‐ -‐

Protective layer Wecryl 233/ -‐thix 10 /-‐thix 20

approx. 4.0 -‐ -‐

Wecryl 233 Wi approx. 4.0 -‐ -‐ Wearing layer Substrate -‐

Smooth Sanded

Wecryl 220 approx. 0.6 approx. 0.6 – 0.8 -‐ Wecryl 288 approx. 0.6 approx. 0.6 – 0.8 -‐




Reaction time (approx. values at 20 °C) Pot life Rain-‐proof Overcoatable Curing time Wecryl 298 10 minutes 30 minutes 45 minutes 3 hours Wecryl 230/-‐thix 15 minutes 30 minutes 1 hour 3 hours Wecryl 230 TT 20 minutes 45 minutes 75 minutes 6 hours Wecryl 233/ -‐thix 10 /-‐thix 20

15 minutes 30 minutes 1 hour 3 hours

Wecryl 233 Wi 20 minutes 45 minutes 75 minutes 6 hours Wecryl 220 15 minutes 45 minutes 1 hour 3 hours Wecryl 288 15 minutes 45 minutes 1 hour 3 hours

Application tools

Product Application tool Wecryl 298 Sheepskin roller Weplus 251 Stanley knife, circular saw Wecryl 230/-‐thix Sheepskin roller Wecryl 230 TT Sheepskin roller Weplus Fleece Scissors Wecryl 233/ -‐thix 10 /-‐thix 20

Sheepskin roller

Wecryl 233 Wi Coating trowel with triangular teeth (notch pattern 92) or smoothing trowel

Wecryl 220 Finish roller or hard rubber blade (for topped surfaces)

Wecryl 288 Finish roller or hard rubber blade (for topped surfaces)

Substrate preparation and bonding of the Vapour Release Mesh

Correct substrate preparation is essential for ensuring the lasting integrity of the WestWood system. Generally the substrate must be sound, dry and free from loose and adhesion-‐reducing particles. That is why coats of paint, cement slurry, dirt and grease, for instance, must always be removed completely. As a rule this is done by shot blasting, milling or grinding and then vacuuming off the debris. The exact arrangement of the outlets in the Weplus 251 Vapour Release Mesh must be planned prior to installation. There are numerous options for the location and integration of these outlets. As a rule the outlets can be concealed when the system is installed. Cut the Vapour Release Mesh to size and allow it to rest (curling tendency). Depending on substrate conditions, Wecryl 298 is used to bond the mesh to the prepared substrate. (Please contact our technical advisory service.) Use a sheepskin roller to apply approx. 600 -‐ 800 g/m² Wecryl 298 to the prepared substrate to form an even film as an adhesive bed/primer for Weplus 251 Vapour Release Mesh. Avoid creating puddles of primer. The prepared mesh is then embedded in the primer while this is still wet and pressed into the bed with a roller across the entire area. Joints are butted together. We recommend weighing down the edges of the mesh to ensure a full bond. Weighing down the ends also prevents the mesh from slipping. If the substrate is very uneven, Wecryl 230 thix can be applied as a bonding coat after the surface has been primed with a thin layer of Wecryl 298. Use a




Waterproofing of details and the main area Protective layer Wearing layer

notched trowel to apply a thin layer of Wecryl 230 thix. Consumption: approx. 0.8 to 1.2 kg/m2. Once the bonded mesh has cured, the joints of the Weplus 251 Vapour Release Mesh are waterproofed with Wecryl 230 and a fleece. Apply a generous and even layer of the mixed material to the area of the butt joints at a width of 15 cm (at least 1.5 kg/m²), then immediately embed the 15 cm wide Weplus Fleece and use a sheepskin roller to remove any air bubbles. Apply the remaining material directly (wet in wet) up to the required consumption rate. Use a sheepskin roller to spread the material over the surface. Fleece overlaps must be at least 5 cm wide. Please refer to our drawings of details and computer animations for further information about waterproofing details (e.g. cutting the fleece to size). The details and upstands etc. are also waterproofed at this stage. Wecryl 233/-‐thix 10/-‐thix 20/-‐Wi -‐ Self-‐levelling mortar Use a notched or smoothing trowel to apply an even layer (approx. 4.0 kg/m²) of mixed self-‐levelling mortar once previously applied products have hardened. The protective layer can then be topped with quartz sand or left smooth, as required. Wecryl 288 – Finish + Weplus Chips (slip resistance up to R 10) This build-‐up creates areas with sufficient slip resistance for domestic use and that are also easy to clean using common domestic products. Use the finish roller to apply an even layer of the mixed material (approx. 0.6 kg/m²) to the hardened self-‐levelling mortar. Avoid fluctuating layer thicknesses. Immediately afterwards use a hopper spray gun to apply Weplus Chips to the liquid Finish. Depending on the desired surface design, the coloured chips can first be mixed and a greater or lesser amount applied. However, applying an excess quantity should be avoided, i.e. when applied, the chips should not form a continuous coating at any point. Avoid fluctuating layer thicknesses. Wecryl 288 -‐ Finish + Weplus Quartz Sand (slip resistance up to R 12) A quartz sand topping sealed with pigmented Wecryl offers greater slip resistance with increased roughness height and is used predominantly for escape routes in residential and commercial buildings as well as in multi-‐storey car parks. Sprinkle Weplus Quartz Sand onto the protective layer (self-‐levelling mortar) while this is still wet. Once the self-‐levelling mortar has hardened, vacuum off the loose sand and use a finish roller to seal the entire surface with the Finish. For an enhanced appearance you can also use a hard rubber blade to apply the Finish and then use a finish roller for laying-‐off. Depending on the particle size of the topping, the consumption rate for the Finish will be between approx. 0.60 and 0.80 kg/m². Avoid fluctuating layer thicknesses.




Wecryl 220 + Weplus Colour Quartz Sand (slip resistance up to R 12) A Colour Quartz Sand topping sealed with transparent Wecryl offers an enhanced and sophisticated appearance as well as greater slip resistance with increased roughness height and is used predominantly for escape routes in residential and commercial buildings as well as in multi-‐storey car parks. Sprinkle Weplus Colour Quartz Sand onto the protective layer (self-‐levelling mortar) while this is still wet. Once the self-‐levelling mortar has hardened, vacuum off the loose sand and use a finish roller to seal the entire surface with the Finish. For an enhanced appearance you can also use a hard rubber blade to apply the Finish and then use a finish roller for laying-‐off. Depending on the particle size of the topping, the consumption rate for the Finish will be between approx. 0.60 and 0.80 kg/m². If Wecryl 220 transparent Finish is applied, please ensure that the same proportion of catalyst is added to all batches that are mixed. Avoid fluctuating layer thicknesses.

Design options WestWood systems offer excellent scope for creative designs. Wecryl 220 or Wecryl 288 can be used to create surfaces that are transparent or have one or more colours. The Finish also allows any pattern or markings to be incorporated. In conjunction with topping materials there are many additional design options.

Cleaning the tools If work is interrupted or when it is completed, clean the tools thoroughly with Weplus Cleaning Agent within the pot life of the material (approx. 10 minutes). This can be done with a brush. The tools are ready to be used again as soon as the Cleaning Agent has evaporated fully. Simply immersing the tools in the cleaning agent will not prevent the material from hardening.

Information on safety and risks Please refer to the safety data sheets for the individual products.

General information The above information, especially information about application of the products, is based on extensive development work as well as many years of experience and is provided to the best of our knowledge. However, the wide variety of requirements and conditions on site mean that it is necessary for the product to be tested to ensure that it is suitable for the intended purpose. Only the most recent version of the document is valid. We reserve the right to make changes to reflect advances in technology or improvements to our products.

Appendix System drawing Rev: 28.3.2014 Version 1.1


Specification for installation


Rev: 27.3.2014 Version 1.1

Substrate 1 Mineral substrate: Shot-‐blasted or abraded, cleaned Bonding / Primer layer 2 Wecryl 298 Vapour release layer 3 Weplus 251 Vapour Release Mesh Protective layer 4 Wecryl 233/-‐thix 10/-‐thix 20/Wi Wearing layer 5 Wecryl 220 or Wecryl 288, Colour Quartz Sand, Weplus Quartz Sand or Colour Chips (slip resistance up to R 12)

Waterproofing for details (The butt joints of the Vapour Release Mesh are waterproofed with Wecryl 230 and fleece) 6 Wecryl 230/-‐thix applied with fleece 7 Wecryl 220 or Wecryl 288, Colour Quartz Sand, Weplus Quartz Sand or Colour Chips (slip resistance up to R 12)

WEPLUS VAPOUR RELEASE SYSTEM

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