Topflow Screed A
Verified by manufacturer 15 days ago
Screed A Steeldeck
Screed A Steeldeck
BBA Agrément Certificate
Certificate type
Free flowing, anhydrite self compacting floor screed.
Application
- Suitable for a wide range of applications. Its high thermal conductivity and minimum thickness make it suitable for use with underfloor heating (fully encapsulates heating pipes/ cables).
- Free from protein and it doesn’t harbour potentially harmful bacteria making it suitable for hospitals and care homes.
- Not suitable as a wearing surface itself, or for external or permanently wet areas such as swimming pool surrounds and cannot be laid to falls.
Description
Topflow Screed A is manufactured with a synthetic anhydrite binder in place of cement and is pump applied due to its fluid consistency. It is easier to install, covering areas of up to 2000 m² per day.
Find the right Topflow Screed A low carbon liquid screed for your project:
Topflow Screed A FD E2C : Faster drying floor screed that is earlier to cover
Topflow Screed A Thermio + : Liquid screed for underfloor heating with guaranteed thermal conductivity backed by BBA
Topflow Screed A XTR : Screed for UFH and higher floor loadings
Topflow Screed A Finio : Thin section lightweight liquid screed
Topflow Screed A Excelio : Ultra thin floor screed
Features and benefits:
- Manufactured to BS EN 13813:2002, with a recycled source of gypsum (calcium sulfate) rather than cement. It has a free-flowing fluid consistency and is applied by pump.
- Floors are suitable for foot traffic within 24–48 hours, while drying takes 40 days, or sooner with force drying (available after only seven days).
- Lower carbon footprint than traditional cementitious screeds.
- Suitable for use with low energy underfloor heating.
- Any type of floor finish can be applied to the screed.
- Maintenance of fluidity for two hours.
- The screed is produced using Gyvlon binder which is manufactured from an industrial by-product (average 36% recycled content).
- Water demand: 13–18% b.w.
- Flow range: 230–280 mm.
- Volite Organic Compound (VOC) free and 100% recyclable.
Screed thickness:
- Bonded: Minimum (Topflow Screed A Excelio) 8 mm (over maximum 30% of total floor area).
- Unbonded: Minimum: 20 mm (Topflow Screed A Finio & Excelio)
- Floating over thermal/ sound insulation: Minimum: 30 mm -domestic (Insulation min 140kPa) 35mm commercial (Topflow Screed A Finio & Excelio)
- Floating over sound insulation - rubber acoustic layer: Minimum: 25 mm (Topflow Screed A Finio & Excelio)
- Cover over conduits/ heating pipes: Nominal: 25 mm, Maximum: 80 mm.
(For full details see table in Topflow Screed A Range Guide on tarmac.com)
General information
Color | White Guidance for specification option: Off-white. |
Finish | Smooth |
Material | Calcium sulphate Guidance for specification option: Gypsum with anhydrite binder. |
Shape | Formless Manufacturer guidanceFormless. |
Uniclass | |
CAWS | M13/120 Proprietary self smoothing levelling screeds |
Specification data - Ready-mixed self-smoothing calcium sulfate screeds
Form | Ready mixed. |
Mix | Gypsum (calcium sulfate) with anhydrite binder. |
Appearance | Off-white fluid mortar. |
Water | Demand, 13–18% b.w. |
pH | >10. |
Density | 2200 kg/m³ (wet), 2000 kg/m³ (dry). |
Compressive strength - 28 days | To BS EN 13813, C25. |
Flexural strength | To BS EN 13813, F4. |
Thermal expansion | 0.012 mm/mK (minimum). |
Drying time | 40 days. Guidance for specification option: Or sooner with force drying (available after only seven days). |
Surface finish | To BS 8204, SR2. |
Fire resistance | To BS 476-4, Non-combustible. |
Sustainability data
Material | Calcium sulphate Guidance for specification option: Gypsum with anhydrite binder. |
Embodied carbonA1-A3 (production stage) as defined in BS EN 15804 | 60.29 kg CO₂ eq/m³ |
Recyclability | 98% |
Recycled contentAs defined in clause 7.8 of BS EN ISO 14021 | 36 % |
Third party certifications
BBA Agrément Certificate
BBA certificate 16-5301 Anhydrite Screeds
BBA Agrément Certificate
BBA certificate 16-5301 Thermio+ Anhydrite Screeds
Literature
Topflow Screed A Range Guide and Product Data
Case studies
Fast, efficient anhydrite floor screed solution for modern apartments
Floor screed for underfloor heating at luxury retirement village
Low carbon floor screed for apartment block in Birmingham's Jewellery Quarter
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Topflow Screed A Thermio