Fosroc Brushbond TI Flexicoat
Elastomeric acrylic, microsphere-filled solar-reflective and thermal-insulating coating that reduces substrate temperature by a minimum of 10C while bridging hairline thermal cracks.
What is it?
A single-component, water-based white elastomeric acrylic coating loaded with hollow non-conductive microspheres (under 100 microns) that act as a thin thermal-insulation and solar-reflective blanket. It carries useful flexibility and hairline-crack-bridging, with limited supplementary water-resistance.
Where is it used?
Concrete and metal roof slabs, external/internal building walls, asbestos and metal sheet roofs, cold-storage and freezer rooms, steam pipes and fittings, and over wood, tiles, PU foam and asphalt shingles.
Why use it?
It reflects solar radiation back to the atmosphere, lowering temperature behind the substrate by a minimum of 10C, easing air-conditioning load and protecting roofs from thermal-cycling stress in hot Indian climates.
How is it applied?
Add 20% clean water (4 L to a 20 L pack), mix with a slow-speed paddle drill, prime porous cementitious surfaces with a polymer-modified slurry, then brush, roller or spray a minimum of two coats to 300 microns DFT.
About Fosroc Brushbond TI Flexicoat
Fosroc Brushbond TI Flexicoat is a water-based, white elastomeric coating built around acrylic polymers blended with specially engineered hollow microspheres less than 100 microns in diameter. These non-conductive microspheres behave as a continuous thermal-insulation blanket once the coating cures, reflecting incident solar radiation back into the atmosphere rather than letting it conduct into the structure. The measurable outcome, per Fosroc’s data, is a temperature reduction behind the coated substrate of a minimum of 10C, which is why the product is positioned as a thermal-insulation and solar-reflective system first, and a supplementary water-resistant film second.\n\nIt is important to set expectations honestly for Indian specifiers. Fosroc’s own technical data sheet describes Brushbond TI Flexicoat as having only certain waterproofing properties and explicitly notes a limited resistance to water permeability. On concrete, Fosroc recommends using it in conjunction with their dedicated Brushbond, Nitoproof or Proofex waterproofing systems rather than as a stand-alone membrane. The coating’s real strength is heat management and surface durability: high UV resistance, breathability that allows water vapour to escape, and high elongation that lets it accommodate thermal movement and bridge hairline cracks. For contractors and consultants in Delhi NCR and across India, that makes it a cool-roof and energy-saving coating with a secondary protective benefit, not a primary roof waterproofing membrane.\n\nSpace Arc Engineering supplies and applies Brushbond TI Flexicoat as an authorised Fosroc distributor and applicator. We typically specify it as the reflective top layer over a properly waterproofed deck, so clients get both a watertight roof and a cooler, lower-energy building envelope.
The technical insight
The performance physics here are about reflectance and conductivity, not membrane thickness. Brushbond TI Flexicoat has a measured thermal conductivity of roughly 0.1 W/mC, against approximately 1.28 W/mC for normal concrete and 16.0 W/mC for steel, so a thin film dramatically reduces heat transmission into the substrate. The white pigmentation and microsphere geometry drive high solar reflectance, while the acrylic matrix delivers Shore A hardness of 45-55, tensile strength at break of 1-1.5 N/mm (ASTM D 412) and 100% elongation at break (ASTM D 412). That elongation is what allows hairline-crack bridging across thermally cycling roofs. The film stays serviceable from -30C to +90C and showed no cracking, deterioration or loss of flexibility after 3000 hours of Q-UV accelerated weathering, which is a credible indicator of multi-year exterior durability in Indian sun. Because the coating is breathable, vapour escaping from the deck is not trapped under the film, reducing blistering risk compared with non-breathable bituminous systems.
Where it is used
- Cool-roof / solar-reflective coating on concrete and metal roof slabs to cut heat gain and air-conditioning load
- Reflective top-coat over an existing waterproofing membrane on terraces and roofs
- Thermal-insulation coating on external and internal building walls
- Interior walls and roofs of freezer rooms and cold-storage facilities to reduce thermal transmission
- Protective reflective coating on asbestos sheet and other metal roofing surfaces
- Insulating coating on steam pipes and fittings to limit surface heat
- Coating over wood, tiles, PU foam and asphalt shingles where heat reduction is needed
Key advantages
- Reduces substrate temperature by a minimum of 10C, easing cooling loads and energy cost
- Very low thermal conductivity (~0.1 W/mC) from non-conductive hollow microspheres
- Single component, brush/roller/spray applied directly with minimum surface preparation
- High elongation (100%, ASTM D 412) bridges hairline thermal cracks
- Excellent flexibility across a wide -30C to +90C service range
- High UV resistance, with no deterioration after 3000 hrs Q-UV weathering
- Breathable film lets water vapour escape, reducing blistering
- Lightweight, non-toxic and non-flammable, with good resistance to atmospheric pollution
Limitations & considerations
- Not a primary waterproofing membrane: Fosroc states it has limited resistance to water permeability
- On concrete it must be used with Fosroc Brushbond / Nitoproof / Proofex waterproofing systems
- Requires a minimum of two coats to reach the 300 micron DFT for rated performance
- Porous cementitious surfaces need a polymer-modified slurry primer coat first
- Alkaline in nature, so gloves and goggles are required during handling
- Metal surfaces must be thoroughly abraded for a mechanical key before coating
- Hardened coating can only be removed mechanically; clean tools with water immediately
Selection & best practice
Treat Brushbond TI Flexicoat as a reflective, energy-saving top layer, not a roof waterproofing system. On concrete roofs, first install and cure the appropriate Fosroc waterproofing system (Brushbond RFX, Nitoproof or a Proofex membrane), repair any spalled concrete to a sound profile with the Renderoc range, then ensure the surface is clean and free of oil, grease and dirt. Prime highly porous cementitious surfaces with a polymer-modified slurry coat and allow 2-3 hours to dry; metal and non-porous surfaces need no primer but must be abraded for a key. Dilute by adding exactly 20% clean water (4 L into a 20 L pack), mix with a slow-speed paddle, and apply a minimum of two coats to achieve 300 microns DFT, allowing at least 2-3 hours between coats. Do not stretch the diluted yield for extra coverage, and allow for wastage when estimating.
Specifications
| Product type | Elastomeric acrylic polymer, microsphere-filled solar-reflective insulating coating |
| Base / form | Water-based; single-component white emulsion, pasty consistency |
| Microsphere size | Hollow, non-conductive, less than 100 microns diameter |
| Temperature reduction | Minimum 10C behind substrate |
| Thermal conductivity | ~0.1 W/mC (vs ~1.28 for concrete, 16.0 for steel) |
| Surface drying time | 15-20 min at 27C |
| Over-coating time | 2-3 hours |
| Shore A hardness | 45-55 |
| Tensile strength at break | 1-1.5 N/mm (ASTM D 412) |
| Elongation at break | 100% (ASTM D 412) |
| Q-UV weathering | No cracking/deterioration/loss of flexibility after 3000 hrs |
| Service temperature | -30C to +90C |
| Dilution | Add 20% clean water (4 L per 20 L pack) |
| Application | Brush, roller or spray; minimum 2 coats |
| Dry film thickness | 300 microns DFT (after 2 coats) |
| Coverage (concrete) | 2.5-3.0 m/2 coats/litre @ 300 microns DFT |
| Coverage (steel) | ~3.0-3.5 m/2 coats/litre @ 300 microns DFT |
| Pack sizes | 4 L and 20 L packs |
| Shelf life | 6 months unopened, in a cool dry store |
| Safety | Non-toxic but alkaline; non-flammable |
| TDS reference | Fosroc India INDIA/2022/0807/A |
Industry use cases
Commercial & IT real estate (Delhi NCR)
Applied as a cool-roof top-coat over waterproofed RCC terraces of office and IT parks to cut roof heat gain by a minimum of 10C and reduce HVAC running cost during peak North-India summers.
Cold chain & food processing
Coated on interior walls and roofs of freezer rooms and cold storage to lower thermal transmission, helping maintain set-point temperatures and reducing refrigeration load.
Industrial & warehousing
Used on metal and asbestos sheet roofs of factories and warehouses to reflect solar radiation, lower internal shop-floor temperatures and protect the sheeting from UV degradation.
Residential & housing societies
Specified as a reflective, breathable finish over terrace waterproofing on apartment blocks and villas to keep top-floor units cooler and bridge hairline thermal cracks.
Industrial process plants
Applied on steam pipes and fittings as an insulating coating to limit external surface temperature and improve site safety.
Frequently asked questions
Is Fosroc Brushbond TI Flexicoat a waterproofing membrane?
How much does the temperature actually drop?
How many coats and what thickness are required?
What is the coverage and pack size?
How is it diluted and applied?
What is the shelf life and is it safe to handle?
How we position Fosroc Brushbond TI Flexicoat
Within the Fosroc range, Brushbond TI Flexicoat sits apart from the core Brushbond waterproofing family: products like Brushbond RFX (a fibre-reinforced acrylic-cementitious waterproof coating) and Nitoproof or Proofex membranes are the actual watertight layers, while TI Flexicoat is the energy-saving, solar-reflective top layer that goes over them. The honest specification is to pair the two rather than substitute one for the other, since Fosroc itself flags TI Flexicoat’s limited water permeability resistance. Against the wider Indian market, the closest direct competitors as cool-roof / heat-reflective coatings include Dr. Fixit Newcoat Cool and Roofseal Cool, Sika’s reflective acrylic roof coatings (Sikalastic range), STP’s solar-reflective coatings, and offerings positioned by MBS and other domestic manufacturers. Where the requirement is purely a robust standalone roof membrane, an elastomeric or PU liquid membrane (Fosroc Nitoproof / Proofex, Sika Sikalastic, or Dr. Fixit Roofseal) is more appropriate. Brushbond TI Flexicoat is the right call specifically when thermal comfort, solar reflectance and air-conditioning energy savings are the goal, layered on a deck that has already been correctly waterproofed. Space Arc Engineering, as an authorised Fosroc distributor and applicator across Delhi NCR and Pan-India, can specify and install the complete stack so the roof is both watertight and cool.
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