About Fosroc Brushbond Roofguard Premium

Fosroc Brushbond Roofguard Premium is the upgraded, dual-function member of the Brushbond Roofguard family from Fosroc, the construction-chemicals brand long established in the Indian market. Where the original Brushbond Roofguard is a fibre-reinforced acrylic waterproofing render, the Premium grade is engineered as an “acrylic-based modified polyurethane elastomeric solar-reflective cum waterproof coating.” In plain terms, it does two jobs at once: it seals the roof against rainwater and it reflects a large share of incoming solar radiation so the slab underneath stays measurably cooler. For Indian conditions, where a terrace can swing from monsoon ponding to 45°C-plus summer heat within months, that combination is exactly what most exposed roofs need.

The product is a single-component, ready-to-use liquid. There is no two-pack mixing, no induction time and no special site batching, which removes a common source of on-site error and makes it well suited to applicator teams and even supervised semi-skilled labour. Once cured it forms a seamless, jointless elastomeric film that moves with the substrate, so it accommodates the routine thermal expansion and minor shrinkage cracking that defeats rigid, brittle coatings. It is also breathable, allowing residual vapour in the screed or slab to escape rather than building up and blistering the film, and it is formulated as a low-VOC, water-based coating that is mould-resistant and colour-stable under UV.

Brushbond Roofguard Premium is intended for both new construction and refurbishment. It can be applied over sound serviced roofs, flat or sloping roofs, brick bat coba surfaces, china mosaic tile roofs and cement mortar screeds, which makes it a practical re-coat option for ageing terraces where stripping the existing finish is neither economical nor necessary. For Space Arc Engineering’s clients in Delhi NCR and across India, it sits in the sweet spot between a basic acrylic terrace coating and a full polyurethane or APP-membrane system: more durable and more reflective than commodity acrylics, but far simpler and faster to apply than torch-applied membranes.

The technical insight

The defining chemistry here is the acrylic-polyurethane hybrid. Pure acrylic terrace coatings are cheap and easy but tend to chalk, lose elongation and harden over a few summers; pure polyurethanes are tough and elastic but usually need solvent, careful priming and tighter QC. By modifying an acrylic backbone with polyurethane, Roofguard Premium targets the best of both: the elongation reported in its data is greater than 250% with tensile strength above 2 MPa (both to ASTM D412), versus roughly 100% elongation and about 1.10 MPa for the standard fibre-reinforced Roofguard. That much higher strain capacity is what gives the Premium grade its crack-bridging headroom over hairline movement cracks. Solids are around 50% by volume and 55 ± 2% by weight at a density of about 1.30 g/cc, so a meaningful film remains after the water flashes off. The cool-roof function is not cosmetic marketing: the high-reflectance pigmentation re-radiates solar energy and Fosroc cites a surface-temperature reduction of up to 10°C at peak summer, which directly lowers thermal cycling stress on the membrane and reduces heat gain into the top floor. The practical takeaway for specifiers is that this is a movement-tolerant, reflective elastomeric film, not a rigid render — substrate preparation, priming and achieving the full multi-coat wet-film thickness are what unlock those lab numbers on site.

Where it is used

• Waterproofing and solar-reflective protection of exposed RCC terraces and flat roofs
• Re-coating ageing serviced roofs without stripping the existing sound finish
• Sealing and cooling brick bat coba and china mosaic tile roofs
• Protective elastomeric coating over cement mortar screed roofs
• Waterproofing of sloping concrete roofs and chajjas exposed to direct sun
• Cool-roof treatment for top-floor heat reduction in homes, schools and offices
• Terrace and balcony waterproofing on residential and commercial buildings
• Re-waterproofing of leaking roofs as part of refurbishment and repair contracts

Key advantages

• One-component and ready to use — no site mixing, induction time or batching errors
• Dual function: waterproofing plus cool-roof solar reflection in a single product
• Reduces roof surface temperature by up to 10°C in peak summer, cutting heat gain
• High elongation (>250%, ASTM D412) for reliable bridging of shrinkage and movement cracks
• Seamless, jointless elastomeric film with no laps or weak seams
• UV-resistant and colour-stable for long exposed service life
• Breathable coating lets trapped vapour escape, reducing blistering risk
• Low-VOC, water-based and environment-friendly with easy water clean-up
• Mould-growth resistant finish suited to humid Indian climates
• Applies over many existing substrates, making it economical for refurbishment

Limitations & considerations

• Not a structural crack repair — active, moving or wide cracks must be cut, filled and treated first
• Cannot cure or waterproof over standing water or persistently damp, unprepared substrates; correct falls to drains are still required
• Surface preparation and a Fosroc-recommended primer are essential; performance drops sharply on dusty, oily or unsound surfaces
• Quoted elongation, tensile and temperature figures depend on achieving the full multi-coat wet-film thickness — under-application reduces all of them
• Reflective and cooling performance is highest with light colours and degrades as the surface accumulates dirt without periodic cleaning
• Light foot-traffic/maintenance access only; not a wearing screed for parked vehicles or heavy point loads
• Should not be applied during rain or when rain is imminent before the film has dried
• Verify exact coverage, recoat times, primer and colour availability against the current Fosroc TDS for the specific batch and region

Selection & best practice

Specifications

Industry use cases

How we position Fosroc Brushbond Roofguard Premium

Within the Fosroc range, Brushbond Roofguard Premium is the upgrade path from the standard Brushbond Roofguard render, and it sits alongside the wider Brushbond family (such as the cementitious-acrylic Brushbond and Brushbond 200 slurry systems used for tanking and structural waterproofing). For new RCC construction, integral and crystalline approaches like Fosroc Conplast admixtures or a Brushbond tanking coat may be specified below grade, with Roofguard Premium reserved for the exposed terrace finish — they are complementary, not competing. Against the broader Indian market, Roofguard Premium competes with elastomeric and cool-roof terrace coatings from Sika (for example the Sikalastic liquid-applied range), Dr. Fixit (Roofseal and Newcoat), STP Limited, MBS/MYK and similar acrylic-PU systems. Its differentiators are the acrylic-modified-polyurethane chemistry delivering over 250% elongation, the genuine cool-roof temperature reduction, and one-component, low-VOC simplicity that speeds up application versus solvented PU or torch-applied membranes. Where a project demands very high foot traffic, heavy ponding tolerance or a long single-warranty membrane, a reinforced liquid PU or APP membrane may be more appropriate, and Space Arc Engineering — as an authorised Fosroc distributor and applicator in Delhi NCR and Pan-India — can specify the correct system, supply genuine material and execute warranty-grade application.

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