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• Features & Benefits
• Finishes
• Preparation
• Application
• Limitations

Features & Benefits

• Suitable for:
  • Parextherm External Wall Insulation systems (EWI)
  • Parexdirect render systems
  • Can be applied directly to suitable masonry substrates subject to appropriate preparation to match with an insulated facade 
• Unsuitable for:
  • Exposed vertical substrates with a backward incline above 10° - a backward incline may  affect water run off and may have a tendency to hold moisture

Finishes

• Medium Scraped (EHI GM), Fine Scraped (EHI GF)
• Spray Textured (EHI GM & EHI GF)
• Ashlar cuts (EHI GM & EHI GF)

It is possible to acheive a float/sponge/trowel smoothed finish, however this is only recommended for small areas such as smooth bands surrounding windows, plinths and small panels etc. The float sponge/trowel smoothed finish may vary in appearance, particularly due to different factors such as the line and level and condition of the substrate or the appearance of a slurry finish caused by over floating the surface. The latter may produce some micro cracking effect on the render surface which may affect the aesthetical appearance but does not affect its durability. Dark colours are more likely to be affected.

Preparation

Depending on the area of use, the application must conform with the specifications and instructions for the Parextherm and Parexdirect render systems and as detailed in the European Technical Approvals, BBA and IAB certifications.

• Equipment Required:
  • Scraping trowel / I Bar
  • Stainless steel spatula
  • Stainless steel smoothing trowel
  • Notched rule and straight edge
  • Wooden float
  • Sponge
  • Clean tools in water after use

Product Preparation

• Water dosage: approximately 5-6 litres per bag
• Machine mixing time: 3 to 5 minutes
• Mixing time cement mixer: 5 minutes approximately
• Mix whole bag, length of life of mixture approximately 1 hour depending on prevailing conditions.

Application

This must conform with the recommendations and specifications for the Parextherm & Parexdirect Mineral render systems and/or as directed by Parex.

For Parextherm Systems to Suitable Insulations & Parexdirect Systems to Parex Approved Render Boards:

• Apply a 3-5 mm base coat of Maite, embedded with 355 AVU Mesh. (Do not fix the mesh to the insulation and render over it)
• Leave the surface ridged or combed for receiving the EHI GF. Apply the product to the desired finish and required minimum thickness as detailed below or as per the Parex project specification

Spray Textured:

• Apply a level, compact minimum 10 mm thick coat
• Allow to dry and then spray the Textured finish
• Coverage: 12 - 14kg/m2 (1.8 - 2.1m2 per 25kg bag)

Fine Scraped:

• Apply a level, ruled compact 13 mm thick coat, level the surface with a straight edge, spatula or trowel flat
• Allow to dry (3-16) hours and depending on the substrate and drying conditions, scrape the surface in small circular motions using a scraping tool, removing no more than 3 mm from the surface. This scraping process must remove any slight imperfections and bring the application to the specified finished thickness
• Each elevation must be scraped at the same stage, as early scraping will result in a slightly darker shade and later scraping in a lighter shade
• The minimum finished thickness after scraping is 15 mm
• After scraping, any dust on the surface should be removed by brushing with a clean soft bristle brush. Always stand back and examine the whole surface for blemishes and unevenness. Errors must be corrected at this stage as rectification later is not practical
• Coverage (at 10mm thickness): 14 - 16kg/m2 (1.6 - 1.8m2 per 25kg bag)

Rustification/Ashlar Effect:

• It is recommended that a minimum depth of render to the back of the rustification/ashlar cut should be no less than 10mm
• To achieve this depth will require the finished thickness of the main render to be increased to approximately 15 - 20mm
• For ease of application and finish, avoid using Axel 3000, Algirex or 751 Lankolatex in the top coat application of the trowel, float or sponge smooth finish

Limitations

• Product intended for professional use
• It is advisable when completing the different finishes, to take into account the hardening time, which will vary according to climatic conditions
• Avoid applications on substrates exposed to direct sun or in hot drying winds
• In hot conditions dampen the substrate prior to application. Dampen the render after application
• Do not apply to a frozen substrate. Do not use in freezing conditions. Take precautions during damp climatic conditions. (Discolouration could occur)
• Do not apply on very wet substrates or where there are wet patches. (Discolouration could occur)
• Minimum application temperatures: +5°C for light colours, +8°C for dark colours
• Over 30°C, special precautions must be taken
• In order to reduce the risk of colour differences after drying, always use the same batch number for the same façade