Diathonite Screed

Eco-Tech Building Solutions

Diathonite Screed

Diathonite Screed is a lightweight insulating screed made with cork, clay and diatomaceous earth. At λ 0.060 W/mK it breaks the thermal bridge through a floor, and with Diafon underneath...

Diathonite Screed is a lightweight insulating screed made with cork, clay and diatomaceous earth. At λ 0.060 W/mK it breaks the thermal bridge through a floor, and with Diafon underneath it cuts impact noise by 22 dB. Hand or machine applied from 4 cm, on concrete slabs and foam-glass aggregate, with the finished floor built above. Breathable, so trapped moisture escapes instead of condensing; compressive class C7.

Key Features

  • R 0.167 m²K/W per centimetre
  • L’nw 58 dB in the tested floor system
  • Hand or plastering-machine application
  • Fire class A1fl
$285.90

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Technical Details

Specifications

Technical Performance

Product specifications

Technical Documents

7 documents

Key Features

Product highlights

Application

How to apply

Coverage & Yield

Application rates

FAQs

Common questions

Product Brochure

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Technical Performance

Aspect Powder
Colour Grey
Yield (±10%) 6.00 kg/m² per 10 mm of thickness (3.12 lb/ft² per inch of thickness )
Minimum Thickness(±10%) 40 mm
Maximum Thickness/layer 50-60 mm
Grain Size(±10%) 0 – 3 mm (0 – 0.12 in)
Density(±10%) 600 kg/m³ (37.46 lb/ft³)
Water/Cement Ratio 1 – 12.5 L per 25 kg bag (2.91 – 3.30 U.S. gal per 55.1 lb bag)
Application Temperature +5 / +30 °C (+41 / +86 °F)
Drying Time (T=23°C / 73.4°F; R.H. 50% Thickness of 5 cm / 1.97 in: 28 days
Thermal Conductivity (λ) 0.060 W/mK (EN 12667)
Thermal Resistance for 1 cm Thickness 0.167 m²K/W (EN 12667)
Specific Heat (c) 1000 J/kgK (0.239 kcal/kg°C)(EN 1745 / EN 10456)
Impact Sound Attenuation (ΔLw) 22 dB (for a system composed of Diafon + Diathonite Screed at 50 mm / 1.96 in) (EN ISO 717-2)
Footstep Insulation Index L’nw = 58 dB (for a system of Diathonite Screed + Diafon + hollow-core concrete floor) (EN ISO 140-7 / DPCM 05.12.1997)
Packaging Paper Bag
Weight 25 kg (55.10 lb)

Technical Documents

  • Diathonite Screed Technical data sheet

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  • Diathonite Screed Technical specification

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  • Diathonite Screed LEED WELL

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  • Diathonite Screed Declaration of performance EN 13813 CE

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  • Diathonite Screed Declaration of performance EN BS 13813 UKCA

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  • Diathonite Screed Safety data sheet

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  • EPD Verification for Diathonite Evolution, Diathonite Acoustix, Diathonite Acoustix+, Diathonite Deumix+, Diathonite Screed, Diathonite Thermactive.037, Diathonite Sismactive

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Key Features

  • R 0.167 m²K/W per centimetre
  • L’nw 58 dB in the tested floor system
  • Hand or plastering-machine application
  • Fire class A1fl

Application

  • Trowel
  • Plastering Machine

    • Coverage & Yield

    Package: 25 kg (33.7 lbs)

    Coverage:
    • 6.0 kg/m² per 10 mm (± 10 %)
    • 3.12 lb/ft² per inch (± 10 %)

    Application Range:
    Minimum 40 mm (1.6 in) |
    Maximum per layer 50–60 mm (2.0–2.4 in)

    Per 25 kg (55 lb) Package:
    • At 40 mm: 1.0 m² (11 ft²)
    • At 50 mm: 0.83 m² (9 ft²)
    • At 60 mm: 0.69 m² (7 ft²)

    Frequently Asked Questions

    What is Diathonite Screed used for?
    It's designed for thermal and acoustic floor insulation in residential, commercial, and public buildings. Ideal for concrete slabs and floating floor systems.

    Can it be used with radiant heating?
    Yes — Diathonite Screed is compatible with radiant heating systems and helps distribute heat evenly.

    How thick should it be applied?
    Minimum 40 mm. Maximum 5–6 cm per layer. Can be applied in multiple layers if needed.

    Do I need a primer?
    It depends on the substrate.
    Use Aquabond on smooth, non-absorbent surfaces (e.g., concrete, foam glass, wood).
    Not needed on absorbent or rough substrates.

    How is it installed?
    By hand trowel or spray machine. We recommend professional installation for large projects.

    Is it fire-resistant?
    Yes — classified as A1 (non-combustible) under EN 13501-1.

    Can I walk on it immediately after application?
    No — allow 5–7 days of curing before foot traffic or finishing.

    Can I paint over it?
    Yes — once cured, it can be painted with mineral or lime-based paints.

    Product Brochure

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