Description
Ardex AM50 OCR One Coat Tiling Render is a grey setting sand and cement render that can receive tiling in as little as 24 hours after application. It is preblended, requiring only the addition of water to produce a slump free mortar that can be applied 6-20mm thick in a single coat.
Ardex AM50 OCR One Coat Tiling Render can be applied from 6mm up to 20mm thickness in a single coat. It is suitable for rendering suitably prepared in-situ concrete walls, brickwork and block work. Suitable for use in internal areas, including showers.
Substrate Preparation:
All backgrounds must be suitably stable and any movement joints brought through to the tiling surface, prior to applying Ardex AM50 OCR One Coat Tiling Render. All surfaces must be clean, firm and free of dust, dirt, oil, grease, paint, gypsum plaster and other barriers to adhesion; the use of suitable mechanical preparation equipment may be required. They must have had adequate drying time as given in the relevant part of BS 5385, i.e. in-situ concrete walls, brickwork and should be allowed to shrink for at least 6 weeks.
When applying Ardex AM50 OCR One Coat Tiling Render to concrete substrates, the aggregate surface should be exposed as advised in BS 5385. Settlement cracks can be filled with rendering mortar; however, if they are caused by structural movement, there is no guarantee they can be eliminated. Smalls cracks should be cut out and enlarged so that better contact is obtained. Metal components must be given adequate corrosion protection.
Anchored reinforcements should be installed and mechanically fixed to the background when rendering to the following backgrounds/locations: dense surfaces such as glazed bricks or ceramic tiles; timber framed constructions; old paint finishes that cannot be removed and other weak surfaces. All reinforcement and mesh must be secured in accordance with the manufacturer’s guidance and/or BS 5385.
Mixing:
A 25kg bag of Ardex AM50 OCR One Coat Tiling Render requires approximately 4 to 4.5 litres of water. If smaller quantities are required the mortar should be mixed to a slump free consistency so that the mortar does not slide of the trowel and is able to support itself on the wall. Add the Ardex AM50 OCR powder to the water in a clean container, whilst stirring and mixing thoroughly until a slump-free mortar is achieved. The use of an Ardex mixing paddle with a 10mm chuck, variable-speed electric drill makes light work of mixing, or a forced action mixer can be used for larger quantities. Pot life is a minimum of 2hr and the render should be remixed approximately every 20 minutes.
Application:
Apply at temperatures above 5°C. Ardex AM50 OCR One Coat Tiling Render should firstly be applied as a 1-2mm thick skim coat/bonding layer, before the remaining required thickness is applied fresh-infresh. When applying to the deeper thicknesses over larger areas, the material can be applied in two layers if preferred. For example, for a total depth of 20mm, a 14mm thick layer can be applied, allowed to harden and then followed by a 6mm thick layer. When applying in two layers, ensure the top layer is always thinner than the initial layer.
Depending on the render thickness, the porosity of the background being rendered, further treatment such as wood floating can be carried out between 2-3 hours after application at 20°C. If required, Ardex WPC for wet (not submerged) areas can be applied typically after 24 hours at 20°C.
Tiles can typically be fixed in as little as 24 hours at 20°C using an appropriate ARDEX Cement-Based Tile Adhesive. These times are dependent on site conditions, and will be extended in lower temperatures and shortened at higher temperatures.
Coverage:
Approximately 1.4kg of Ardex AM50 OCR One Coat Tiling Render powder/m2/mm i.e. a 25kg bag will cover approximately 3m2 at 6mm thick.
Technical Data:
Bulk density: approximately 1.4kg/m3
Weight of fresh mortar: approximately 1.6kg/litre
Application time (20°C): minimum 2 hour working time
Ready to receive wall tiling (20°C): approximately 24 hours
Compressive Strength: After 28 days – 3.5-7.5N/mm²
Tensile Bending Strength: After 28 days – approximately 3N/mm²
Reaction to fire: Class A1
pH value: Fresh mortar containing cement, approximately 12
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