About Fosroc Renderoc Tema BS

Fosroc Renderoc Tema BS is a single-component, cement-based plastering mortar that forms the basecoat of the Renderoc Tema theming system – Fosroc’s specialised range for creating sculpted, carved and textured decorative concrete surfaces. Supplied as a pre-blended dry powder, it requires only the addition of clean water on site to produce a cohesive, sprayable mortar with a fresh (wet) density of approximately 1.55 kg/litre. In a typical build-up the BS (basecoat) layer is sprayed first to establish thickness and a mechanical key, and the companion Renderoc Tema theming mortar (fresh density approximately 1.70 kg/litre) is then applied over it and hand-carved or stamped to mimic natural rock, bark, stone or other textures.\n\nThe “theming” application is what sets this material apart from ordinary repair or plastering mortars. Across India – in adventure and water parks, hotel and resort landscaping, zoos and safari enclosures, themed retail and entertainment fit-outs, and architectural feature façades – designers increasingly specify sprayed cementitious systems to recreate natural geology over a steel-and-shotcrete armature. Renderoc Tema BS is engineered specifically for that workflow: it builds up economically in successive sprayed passes, develops good adhesion to concrete and masonry, and produces a stable, low-movement substrate that the decorative topcoat can bond to without delamination.\n\nBecause it belongs to the wider Renderoc family – Fosroc’s concrete repair and rendering range that includes Renderoc HB, Renderoc GP, Renderoc S, Renderoc Plaster and Renderoc Primer – it shares the family’s polymer-modified, cementitious philosophy of good adhesion, controlled shrinkage and resistance to weathering. For Space Arc Engineering customers, Renderoc Tema BS is most relevant to contractors and specialist applicators executing decorative-concrete and landscape-theming packages rather than structural repair, though the same surface-preparation and curing disciplines that govern Fosroc repair mortars apply equally here.\n\nIt is important to be candid about the limits of public data. Fosroc lists Renderoc Tema and Renderoc Tema BS on its global product site and regional catalogues, but a full numerical technical data sheet (compressive/flexural strengths, coverage tables, pack sizes) is distributed regionally and on request rather than published openly. The figures stated on this page that carry units are limited to what Fosroc publishes – principally the fresh densities – and any project-critical value should be confirmed against the current regional TDS before specification.

The technical insight

Renderoc Tema BS is a “scratch coat” in render-system terms: its job is build-thickness, adhesion and a mechanical key, not aesthetic finish. The basecoat is deliberately formulated at a lower fresh density (~1.55 kg/l) than the theming topcoat (~1.70 kg/l) – the lighter, more open basecoat sprays and builds economically and accepts a deep scratch key, while the denser theming coat carries the carved, weather-facing finish. Both are dry pre-blends needing only clean water, which removes site batching error and gives consistent, repeatable mortar from bag to bag – essential when a single themed rockface may need dozens of sprayed square metres to colour-and-texture-match. Performance is therefore governed less by the powder and more by substrate preparation and curing: the armature concrete or shotcrete must be sound, clean and brought to a saturated-surface-dry condition, and each sprayed coat must be properly cured (and, in Indian summer conditions, protected against rapid drying) so the basecoat does not shrink away from the theming coat above it.

Where it is used

• Spray-applied basecoat (scratch coat) for the Renderoc Tema decorative theming-mortar system
• Artificial rockwork and themed geology over steel-reinforced shotcrete armatures
• Water-park, adventure-park and resort landscape features (waterfalls, cliffs, caves)
• Zoo, safari-park and aquarium naturalistic enclosure surfaces
• Themed retail, hospitality and entertainment interior and exterior feature walls
• Architectural façade texturing and decorative concrete finishes
• Build-up coat to establish thickness and profile before hand-carving the theming topcoat

Key advantages

• Single-component dry powder – only clean water added on site, minimising batching error
• Formulated for machine spray application, enabling fast high-build coverage over large themed surfaces
• Lower fresh density (~1.55 kg/l) basecoat that builds economically and accepts a deep scratch key
• Part of a matched system – designed to bond with the Renderoc Tema theming/carving topcoat
• Cementitious chemistry from the established Fosroc Renderoc range, suited to interior and exterior use
• Good adhesion to concrete, masonry and sprayed-concrete substrates when properly prepared
• Backed by Fosroc India technical support and supplied locally by Space Arc Engineering

Limitations & considerations

• Not a structural concrete repair mortar – it is a decorative/theming basecoat, not a substitute for Renderoc HB, Renderoc S or similar load-path repairs
• A full numerical TDS (compressive/flexural strength, coverage, pack sizes) is region-specific and not openly published – confirm values with the regional sheet before specifying
• Performance depends heavily on correct substrate preparation (sound, clean, saturated-surface-dry) and on curing – poor SSD or curing risks shrinkage and delamination
• Requires skilled spray application and an experienced theming applicator to realise the intended finish
• Hot, dry or windy Indian site conditions accelerate water loss and demand active curing/protection
• Designed to work with the Renderoc Tema topcoat – using it as a stand-alone render outside the system is outside its intended scope
• Application thickness, water demand and yield should be taken from the current TDS rather than assumed

Selection & best practice

Specifications

Industry use cases

How we position Fosroc Renderoc Tema BS

Renderoc Tema BS sits in a specialised niche – the basecoat of Fosroc’s decorative theming system – rather than competing head-to-head with general concrete-repair or waterproofing products. Within the Fosroc range it pairs exclusively with the Renderoc Tema theming/carving mortar, and customers should not confuse it with structural Renderoc repair mortars such as Renderoc HB, Renderoc S, Renderoc GP or Renderoc Plaster, which serve different functions; Fosroc Renderoc Primer is the relevant bonding aid where extra adhesion assurance is needed. For projects evaluating other decorative-theming or sprayed-render systems, comparable offerings exist from Sika (decorative and repair mortar ranges), MYK Arment/MBS, STP Limited and Dr. Fixit (render and plaster systems) – these vary in carvability, colour matching and applicator support, so the right choice depends on the finish, substrate and exposure. Honest positioning: Renderoc Tema BS is the correct pick when a project is specifically using the Renderoc Tema theming workflow and wants a matched, manufacturer-backed basecoat; it is not a stand-alone render or a structural product. Space Arc Engineering, as an authorised Fosroc distributor across Delhi NCR and Pan-India, can supply the full system, provide region-current datasheets, and recommend the right Renderoc product where a different repair or finishing need is identified.

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