The Isocrete range of screeds include self-levelling products that are poured as a liquid and spread evenly across a surface, and more rigid mixes that are applied with a dryer consistency. Flowcrete UK’s Isocrete screeds provide practical solutions for both new construction and renovation projects.
Discover the Power of Flowcrete Isocrete for Floors
Flowcrete screeds are strong, quick to install, and provide excellent moisture control. They work well with subfloors like underfloor heating and acoustic systems. Suitable for both large industrial or commercial projects and small domestic flooring needs.
These BS 8204-7 compliant screeds are easy to lay, require less labour, and dry faster than other materials, helping to speed up construction timelines. Some of the systems can be applied in thinner layers than the semi-dry screeds, reducing shrinkage and offering high compressive strength. They also deliver excellent thermal conductivity when paired with underfloor heating.
Types of Isocrete Products for Floors
Flowcrete’s Isocrete Floor Screeds have been a top choice in the UK since 1969. Known for their quality, they continue to set the standard for floor screeds. Learn more about the Isocrete range below.
Isocrete 1500 Plus (0-30mm)
A quick-drying underlayment designed for levelling concrete floors. Prepares surfaces for floor coverings with ease.
Product Features
- Quick Installation: Covers up to 2,000m² per day at 7mm thickness under suitable conditions.
- Protein-Free: Does not support the growth of bacteria, yeast, or mould.
- Fast Drying and Setting: Walkable in 2-4 hours and ready for moisture-sensitive finishes within 24 hours (under 10mm).
Installation Service
A licensed contractor with a quality assurance plan must handle the installation. Contact your local Tremco CPG office for information on licensed contractors. Application instructions are available on request.
Isocrete 1500 (0 – 20 mm)
A quick-drying underlayment that can be applied by hand or pump. It levels concrete floors to prepare them for floor coverings like vinyl, carpet, ceramic tiles, woodblock, linoleum, or cork.
Uses of the product
Designed for fast-track refurbishment and new construction projects where quick floor finishing is required. Suitable for smoothing floors in offices, shops, public buildings, schools, hospitals, airports, and prisons. It can be used as a screed for epoxy resin finishes in light traffic areas. For industrial applications, use Flowscreed Industrial Top.
Curing time
Curing Time (20°C):
Ensure the area is weather-tight, with all roofs, windows, and doors covered. Protect the screed from draughts and strong sunlight for 24 hours after installation.
Moisture-sensitive floor finishes can be applied once the screed reaches 75% RH as per BS8203. This typically takes 1-3 days, depending on thickness and conditions (20°C, 50% RH).
Restrict access to the screed for at least 12 hours (preferably 24) to avoid surface damage. Light foot traffic is possible after this period.
Normal site traffic and partition installation can occur after the screed hardens, usually within 24-48 hours.
Note: In colder conditions, these times may be longer.
Application Process
Mix only as much material as you can use within 10 minutes at 20°C. Higher temperatures will reduce the working time. The ideal substrate temperature is between 15°C and 25°C, but it must not be below 5°C or above 25°C. Ensure the substrate temperature is at least 3°C higher than the dew point during application and curing.
The base slab and air temperatures must stay above 5°C for 72 hours after application. Keep ambient humidity above 50% RH during the application and curing process. Prevent fluid screeds from drying too quickly before they are strong enough to handle natural shrinkage. Apply in a stable, draft-free environment, away from strong sunlight.
Isocrete 4000 (0 – 50 mm)
Isocrete 4000 is a fast-drying screed designed for levelling and smoothing floors. It is applied manually using a trowel.
Uses of the product
This product is ideal for filling holes or depressions where quick drying is needed. It is perfect for fast-track refurbishments or new builds where flooring like carpets, ceramic tiles, vinyl, linoleum, wood block, or cork must be installed quickly.
It is suitable for smoothing floors in offices, homes, schools, hospitals, and similar spaces exposed to light or moderate traffic.
For screeds requiring an epoxy resin finish in light traffic areas, use Isocrete 1500. For industrial flowing screeds, choose Flowscreed Industrial Top.
Curing time
The area to be screeded must be weatherproof, with all roofs, windows, and doors covered. Protect the screed from draughts and strong sunlight during installation and for 24 hours afterwards.
Moisture-sensitive floor finishes can be applied once the screed is dry to 75% relative humidity (RH) as outlined in BS8203. This typically takes one day, depending on thickness and conditions (20°C, 50% RH).
Restrict access to the screed for at least 12 hours, ideally 24 hours, to avoid surface damage. Light foot traffic is possible after this period.
Normal site traffic and partition installation can occur once the screed has hardened, usually within 24 to 48 hours.
Note: These times may be longer in cold weather. If the ambient humidity exceeds 75% RH, drying time will also increase, though curing will not be affected.
Application Process
Mix only as much material as you can use within 10 minutes at 20°C. Higher temperatures will reduce working time. The substrate temperature should be between 15-25°C, with a minimum of 5°C and a maximum of 25°C. During application and curing, the substrate temperature must be at least 3°C above the dew point. Ensure the base slab and air temperatures stay above 5°C for 72 hours after application. Ambient humidity should be at least 50% during application and curing. Avoid letting fluid screeds dry out too quickly before they gain enough strength to handle natural shrinkage. Apply the material in an environment with stable temperature, no drafts, and protection from strong sunlight.
Isocrete Glass Fibre Mesh
E-glass glass fabric with special SBR finishing ensures form stability and excellent resistance to alkali.
Uses of the product
Reinforce cracks and daywork joints with Isocrete Self Level Renovation. Ideal for areas with minimal movement.
Isocrete HB
Isocrete HB is a lightweight, high-build repair mortar designed for vertical and overhead applications. It features low shrinkage, unique polymers, and fibre reinforcement for reliable performance.
Primary Applications
- Repairs for overhead and vertical surfaces
- Resurfacing damaged or worn concrete
- Hand-applied concrete repairs
- Spray-applied concrete repairs
- Suitable for both indoor and outdoor use
Features and Benefits
- Easy to mix and handle with a single component.
- Can be applied using the wet spray method.
- Contains no chloride admixtures.
- Achieves 100 mm thickness on vertical and horizontal surfaces and 60 mm on overhead surfaces in one application.
- Includes a built-in corrosion inhibitor.
- Low permeability protects rebar from corrosion.
- Offers strong adhesion with high bond strength.
- Can be coated with specialist membranes for added protection and improved appearance.
Isocrete Isoseal
Isocrete Isoseal is a two-part, water-based epoxy sealer.
Uses of the product
This product is designed for use with anhydrite screeds before applying cementitious or resin-based coatings. It can be coated with Hydraseal DPM surface damp proof membrane to allow the installation of moisture-sensitive flooring when the screed has a humidity level above 75% RH. The humidity of the anhydrite screed must not exceed 85% RH when using this method.
Curing time (at 20°C and 50% RH)
- Dries to the touch in 2-4 hours and can be recoated after 16 hours.
- Must be recoated within 36 hours.
- Drying times depend on humidity below 85% and good ventilation.
- Fully hardens in 5-7 days.
Application Process
The substrate temperature should be between 15°C and 25°C, but not lower than 10°C. During application and hardening, the substrate temperature must be at least 3°C higher than the dew point.
Isocrete Isoseal should not be applied if the atmospheric or substrate relative humidity (RH) is over 85%. The atmospheric RH must also stay below 85% for 24 hours after application.
Application time/pot life at 20°C is 30 minutes after mixing. Higher temperatures will reduce the application time.
Isocrete K-Screed Additive
Isocrete K-Screed Additive is designed to create fast-drying, high-strength screeds. It is used in Standard Isocrete K-Screed and Heavy Duty Isocrete K-Screed, which are semi-dry cement-based screeds. The contractor provides the Portland cement, sand, and any necessary aggregate.
Uses of the product
High-traffic areas like airports, shopping centres, and hospitals often require a high-strength screed, especially for thin finishes such as carpet, vinyl, wood, or resin. It is ideal for fast-track construction or refurbishment projects where the screed must be ready for use or overlaid quickly.
Standard Isocrete K-Screed works well for most commercial applications. Heavy Duty Isocrete K-Screed is better suited for areas needing high durability, such as hospital corridors, airport terminals, operating rooms, stockrooms, lift lobbies, plant rooms, and commercial spaces with resin floor finishes.
Isocrete MC
Isocrete MC is a high-flow, shrinkage-compensated microconcrete designed for structural repairs in gaps up to 200 mm. It is formulated with high strength to ensure durable and reliable repairs. This product is ideal for repairing large concrete areas with limited access or dense reinforcement. It provides a strong, long-lasting repair fully compatible with the existing concrete.
Primary Applications
- Repair of beams, columns, and other structural components
- Fixing piers, navigation locks, dams, seawalls, and marine structures
- Maintenance of bridges, tunnels, garages, and silos
- Strengthening structural elements exposed to repeated stress
- Adding jackets to beams and columns to improve strength
Features and Benefits
- Compensates for shrinkage.
- Resistant to sulphates.
- Can be poured or used as mortar for repairing complex shapes.
- Quick and easy application reduces repair time.
- Low alkali content lowers the risk of alkali-silica reaction.
- Free from chloride admixtures.
- Suitable for pumping or pouring into tight spaces.
- Self-compacting to eliminate air pockets and honeycombing without the need for vibration.
- High strength and low permeability protect against carbon dioxide and chlorides.
- Alkali content is kept below 3kg/m³, and non-reactive aggregates are used.
- Can be easily coated with specialist membranes for added protection and better appearance.
Isocrete PM
Isocrete PM is a quick-setting, low-shrinkage, single-component mortar. It is designed to be easily pumped and maintains strong contact with the filled section. Just add clean water to prepare the mortar for use.
Primary Applications
Filling gaps in precast units with structural grout.
Applying high-strength pointing for durability.
Features and Benefits
- Pre-mixed to prevent inconsistencies during batching
- Quick to install
- Can be applied by hand or by pump
- Does not require priming
- Gains strength quickly
Isocrete Polymer 70
Isocrete Polymer 70 is a water-based dispersion of a vinyl acetate/ethylene/vinyl chloride terpolymer, used as a bonding agent and screed additive.
- Finish – Gloss
Uses of the product
Dilute for priming or mix with cement for bonding sand, cement screeds, K-Screed, or Fast K Screedfast. Use it as an additive in screed mixes like Isogran.
Curing time
Primer: Allow more than 3 hours to dry. Drying time depends on the ambient conditions and the state of the substrate. It is usually best to let it dry overnight.
Grout: Lay the screed into the grout while it is still wet.
Isocrete PQ
Isocrete PQ is a single-component repair mortar designed for horizontal and form-and-pour projects. It gains strength quickly and only requires water to mix. This material has low shrinkage, provides high early strength, and is easy to use for quick repairs. Repaired areas can handle standard tyre traffic just 5 hours after the final set. It resembles concrete and is ideal for repairing surfaces between 12 mm and 150 mm thick.
Primary Applications
- Highways
- Loading docks
- Vertical/Overhead form and pour applications
- Pavements
- Industrial / commercial / institutional floors
- Parking decks and ramps
- Multi-unit residential
- Roads
- Warehouses
- Bridges
Features and Benefits
- Gains strength quickly while allowing more working time.
- Works for both indoor and outdoor use.
- Ready for light traffic in 4 hours.
- Can be coated with a moisture-tolerant product after 5 hours (20°C / 50% RH).
- Reinforced with micro-fibres.
- Designed to minimise and control shrinkage.
- Suitable for placement between 12 mm and 150 mm.
Isocrete Primer
Isocrete Primer is an acrylic emulsion.
Uses of the product
Isocrete Primer is used to prepare surfaces for Isocrete self-leveling screeds, including Isocrete 1500, 4000, 5000, Self-Level Plus, Self-Level Base, and Renovation.
Drying time (20°C)
It takes about 3 hours to dry. For this to happen, you need low humidity (up to 70%) and good ventilation.
ScreedRapide
ScreedRapide is a screed additive designed to speed up drying time while reducing water use and minimising shrinkage. It delivers high early strength and strong resistance to indentation. Within 7 days, it can meet BS8204-1 Category A (heavy duty) of the BRE Screed Test Classification, depending on temperature and compaction methods.
Uses of the product
Ideal for new construction or refurbishing retail spaces, this screed allows quick trafficking or overlaying. Screeds with Screed Rapide additive can be installed as bonded, unbonded, or floating systems, making them suitable for weight reduction, thermal insulation, or soundproofing. They are also compatible with underfloor heating systems.
Curing time
After laying, cover it with a polythene sheet and leave it for at least 18 hours to allow for proper drying. Longer curing times will result in stronger screeds but will also increase drying time. To quickly reach 75% relative humidity in the screed after removing the polythene, maintain good drying conditions with a temperature of 20°C and ambient humidity of 60%.
Isocrete SL Base (3 – 50 mm)
A quick-drying levelling screed for concrete floors. Suitable for hand or pump application. Ideal for preparing floors for carpets, ceramic tiles, or wood block coverings.
Uses of the product
Isocrete 1500 can be used as a levelling layer with Isocrete Self Level Plus, Isocrete Self Level Renovation, or on its own to prepare concrete bases for thick floor coverings. It is suitable for floors in offices, shops, public buildings, schools, hospitals, airports, and prisons. Use Isocrete 1500 for epoxy resin finishes in areas with light traffic. For industrial applications, choose Flowscreed Industrial Top.
Curing time
The screeding area must be weatherproof, with all roofs, windows, and doors covered. Protect the screed from strong sunlight and draughts during installation and for 24 hours afterwards. Moisture-sensitive floor finishes can be applied once the screed is dry to 75% RH as per BS8203, which usually takes 1–3 days depending on thickness and conditions (20°C, 50% RH).
Restrict access to the screed for at least 12 hours (preferably 24) to avoid surface damage. Light foot traffic is possible after this period. Regular site traffic and partition installation can occur once the screed has fully hardened, typically within 24–48 hours.
Note: Drying times may increase in cold weather or if humidity exceeds 75% RH, though curing will remain unaffected.
Application process
Mix only the amount of material you can use within 10 minutes at 20°C. Higher temperatures will reduce the working time. The substrate temperature should be between 15°C and 25°C, but not less than 5°C or above 25°C. Ensure the substrate temperature is at least 3°C above the dew point during application and curing. The base slab and air temperatures must stay above 5°C for 72 hours after application. Ambient humidity should be at least 50% during application and curing. Prevent fluid screeds from drying too quickly before they gain enough strength to withstand natural shrinkage. Apply in a controlled environment with stable temperatures, no drafts, and protection from strong sunlight.
Isocrete SL Plus (3–30 mm)
A fast-drying, pump-applied underlayment is ideal for levelling concrete floors before installing floor coverings such as vinyl, carpets, ceramic tiles, woodblock, linoleum, or cork.
Use Isocrete 1500 for a screed suitable for light traffic areas requiring an epoxy resin finish. For industrial applications, choose Flowscreed Industrial Top for a durable, flowing screed.
Uses of the product
Isocrete Self Level Plus is ideal for floors in offices, shops, public buildings, schools, hospitals, airports, and prisons.
It can be applied at a thickness of 3–30mm, with an average of 8mm on reasonably level surfaces.
The material provides strong resistance to impact, point loading, and abrasion, making it suitable as a temporary work surface before vinyl is applied.
For deeper fills (20–150mm), it can be combined with graded, round quartzite gravel.
Curing time
The area to be screeded must be fully sealed, with roofs, windows, and doors in place. Protect the screed from drafts and direct sunlight during application and for six hours afterwards.
Moisture-sensitive floor finishes can be applied once the screed is dry to 75% RH as per BS8203, usually within 1-3 days, depending on thickness and conditions (20°C, 50% RH).
Limit access to the screed for at least 12 hours, preferably 24, to avoid surface damage. Light foot traffic is possible after this period.
Site traffic and partition installation are allowed once the screed has hardened, typically within 24 to 48 hours.
In cold weather, these times may be longer. High humidity (above 75% RH) may also extend drying time, though curing will not be affected.
Application process
Mix only as much material as you can use within 10 minutes at 20°C. Higher temperatures will reduce the working time.
The ideal substrate temperature is between 15°C and 25°C, but it must not be lower than 5°C or higher than 25°C.
During application and hardening, ensure the substrate temperature is at least 3°C above the dew point.
After application, keep the base slab and air temperature above 5°C for 72 hours.
Isocrete SL Renovation (5-50 mm)
A quick-drying, pump-applied underlayment reinforced with fibers. Ideal for renovating existing floors before installing vinyl, carpet, ceramic tiles, wood blocks, linoleum, or cork.
Uses of the product
Isocrete Self-Level Renovation is ideal for renovating floors in offices, shops, schools, hospitals, airports, public buildings, and prisons. It can be applied over existing floor finishes like tiles or flooring-grade asphalt.
The material is applied at thicknesses of 5–50 mm, with an average of 10 mm on level surfaces and at least 13 mm if using glass fibre mesh. It can serve as a screed for epoxy resin finishes in areas with light traffic.
For industrial areas, use Flowscreed Industrial Top as a flowing screed.
Curing time
The area to be screeded must be fully sealed, with roofs, windows, and doors in place. Protect the screed from drafts and strong sunlight for at least 6 hours (bonded) or 24 hours (unbonded) after application.
Moisture-sensitive flooring can be installed once the screed is dry to 75% RH, as defined by BS8203. This typically takes 1-3 days, depending on thickness and conditions (20°C, 50% RH).
Restrict access to the screed for at least 12 hours, preferably 24, to prevent surface damage. Light foot traffic can begin after this period.
Normal site traffic and the installation of partitions are allowed after 24-48 hours, once the screed has hardened.
For floating screed, avoid applying loads exceeding 5 N/mm² for at least 14 days after installation.
Note: Cold weather may extend these timeframes. High humidity levels (above 75% RH) will slow the drying process.
Application process
Mix only the amount of material you can use within 10 minutes at 20°C. Higher temperatures will reduce the working time.
The ideal substrate temperature is between 15°C and 25°C but must not be below 5°C. During application and curing, the substrate temperature should be at least 3°C above the dew point.
Ensure the base slab and air temperatures stay above 5°C for 72 hours after application. Ambient humidity should be at least 50% during application and curing.
Prevent fluid screeds from drying too quickly to avoid issues with natural shrinkage. Apply in a controlled environment where the temperature is stable, free of drafts, and shielded from strong sunlight.
Isocrete TT
Isocrete TT (Thin Top) Exterior Topping is a polymer-modified cement-based screed. It is designed to smooth out uneven surfaces and repair internal or external concrete exposed to industrial traffic. It can be pumped to cover up to 1000m² in a single day.
Primary Applications
Isocrete TT is designed to smooth and level concrete surfaces like balconies, patios, driveways, garages, and walkways. It is suitable for areas exposed to regular foot or wheeled traffic. It can also fill holes and repair damaged floors, including concrete or cement/sand screeds. Isocrete TT is ideal for pre-smoothing concrete floors or roof areas before applying a damp-proof membrane.
Features and Benefits
- Pre-mixed to avoid batching issues on-site
- Installs quickly
- Applied using a pump
- Creates a durable, wear-resistant thin layer
- Thickness ranges from 2mm to 20mm
- Gains strength rapidly
Choose DC Flooring for Expert Installation of Flowcrete Isocrete Flooring Solutions
DC Flooring has extensive experience installing Flowcrete Isocrete flooring systems. We use high-quality materials and the latest techniques to deliver excellent results. Our team ensures a smooth and efficient process, meeting the needs of every project. Trust us for reliable and professional flooring services.
(Always consult the manufacturers data sheet before the application of this product!)
FAQs
How do I maintain an Isocrete flooring?
To maintain Isocrete flooring, keep it clean by sweeping or vacuuming regularly to remove dirt and debris. Use a damp mop with a neutral pH cleaner for deeper cleaning. Avoid using harsh chemicals or abrasive tools that could damage the surface. Address any spills promptly to prevent stains. Routine inspections can help identify potential issues early.
Is Flowcrete Isocrete environmentally friendly?
Yes, Flowcrete Isocrete is environmentally friendly. It is designed to minimise environmental impact during manufacturing and application. The materials used meet strict sustainability standards. This makes it a good choice for eco-conscious projects.
How thick can Isocrete be applied?
Isocrete can be applied in thicknesses from 5mm upwards, depending on project requirements. Thicker applications may involve specific preparation to ensure proper bonding and durability. Consult application guidelines to determine the suitable thickness for your needs.
