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Application

  • Ideal 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 unique 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 2,000 m² per day.

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.
  • Easily achieves SR2 surface finish in accordance with BS 8204.
  • The screed is produced using Gyvlon binder which is manufactured from an industrial by-prod­uct (average 36% recycled content).
  • Volite Organic Compound (VOC) free and 100% recyclable.

Applications:

  • Ideal 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.

General information
Specification data - Ready-mixed self-smoothing calcium sulfate screeds
Product Reference

Topflow Screed A

Type

Screed A CA25 F4

Screed A Low Laitance CA25 F4

Screed A Sky CA25 F4/CA35 F6

Screed A SoundBar CA35 F6

Screed A Steeldeck CA25 F4

Screed A XTR CA35 F6

Standard product features

Technical characteristics:

  • Appearance: Off-white fluid mortar.
  • Water Demand: 13–18 % b.w.
  • pH: >10.
  • Density: Wet: 2,200 kg/m³. Dry: 2,000 kg/m³.
  • Flow range: 230–280 mm.
  • Compressive strength at 28 days: CA25F4.
  • Flexural strength at 28 days: 4 N/mm².
  • Thermal expansion: 0.012 mm/mK.
  • Thermal conductivity: 2.0 W/m·K (±0.2).
  • Fire rating (BS 476-4) non-combustible.

Screed thickness:

  • Bonded: Minimum: 25 mm.
  • Unbonded over a solid base: Nominal: 35 mm. Minimum: 30 mm.
  • Floating over thermal/ sound insulation: Minimum: 40 mm.
  • Cover over conduits/ heating pipes: Nominal: 30 mm, Maximum: 80 mm.

Product Options

Type:

-Screed A Steeldeck:

  • Designed specifically to be used with the Lewis Deck dovetail sheeting, for use with timber, metal web or steel joists in masonry, timber or lightweight steel structures.
  • Perfect for ground, separating or mezzanine floor constructions.
  • Increased productivity and improved loading compared to floating floor treatments.

-Screed A Sky:

  • Designed for use in high rise buildings above ten storeys.
  • Specially formulated to reduce moisture loss to pump lines and inline segregation.

-Screed A XTR:

  • Designed for use with underfloor heating systems and where higher than usual loadings are expected.
  • Suitable for both domestic and commercial applications as a floating screed.

-Screed A Soundbar:

  • Designed specifically for use over timber joints both in masonry and timber framed designs.
  • Suitable for both commercial and residential projects where improved acoustic, loading and durability are required.
  • Improved loading compared to timber batten floors.

Literature
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