ProofTherm Lightweight Insulating Screed

Our ProofTherm Insulating Screed is a bagged, lightweight alternative to traditional screed with the added benefit of providing thermal and acoustic insulation. It can be used for flooring or on roofs where it can be installed to falls. ProofTherm is a natural mineral formulation that uses Perlite to provide the insulating aggregate. Perlite is a naturally occurring mineral formed from Volcanic rocks that have expanded and trapped millions of micro air bubbles before cooling and hardening.

ProofTherm lightweight screed is not designed to provide a permanent wearable surface and should be finished off with a cement sand screed or similar.

ProofTherm insulating floor screed is a lightweight, breathable and easy to use insulating screed that is suitable for use on almost all floor structures.

ProofTherm offers a low-cost, effective and simple way of insulating floors to provide greater thermal comfort and increased acoustic insulation.

Suitable for use as a base layer for underfloor heating, it reduces heat loss through the floor and can be applied manually as a “dry” screed or pumped.

Related Downloads

icon-pdf TDS ProofTherm Lightweight Insulating Screed_May 18

icon-pdf  SMET Floor Screeds and Compounds Product Selector

NBSplus National Building Specification Clause

Benefits of ProofTherm Lightweight Insulating Screed

  • Ultra-lightweight – approx. 500kg/m3
  • Insulating: Very low thermal conductivity = effective insulation
  • Acoustic Insulation: The open structure of our insulating render provides effective sound-deadening due to the cellular nature of the Perlite aggregate
  • Fire-resistant: Mineral screed does not burn or emit noxious gas even at 1000c. Tested to fire resistance classification of A1 under EN 998-1
  • Energy Saving: Reduces heat loss through floors
  • Low cost: Requires significantly less product per m2 due to ultra-low density
  • Underfloor heating: The perfect base on which to install an underfloor heating system

Technical Details for ProofTherm Lightweight Insulating Screed

ProofTherm Lightweight Insulating Screed
Maximum Thickness100mm
Minimum Thickness20mm
Use (Internal Use)Yes (requires a watertight, wearing surface)
Use (External Use)Yes (requires a watertight wearing surface)
Thermal Conductivity, λ10dry(W/m2K)T1 (0.1 W/m² K) EN 1745, Chart A1/ EN 1745,

Item 4.2.2

Compressive Strength CS II (3.5 N/mm²) EN 1015 – 11ᵃ
Adhesion(N/mm²) and fracture pattern A,B or CFP: B 1.2 N/mm² EN 1015 – 12
Capillary Water AbsorptionW1(c ≤ 0,4 kg/ m².min.⁰⁵) EN 1015 – 18
Water vapour permeability (μ)≤ 15 ( 5.5 μ ) EN 1015 -19 a,b
Dry bulk density (kg/m³)500 kg/m³ ±10% EN 1015 – 10
Sound insulation dB23db/ 22db/ (3cm/500hz) EN ISO 10140-2
Joule testI 2 (Damaged at 2 joule level) EN 13497
CoverageApprox 5.5 kg per m² @10mm depth. 1 bag=3.63m² @ 10mm
Drying time8 Hours (at 23°C, 50% Relative Humidity)
Full drying time36 Hours (at 23°C, 50% Relative Humidity)
Drying Time for Testing28 days at 23°C, 50% Relative Humidity)
Application Temperature +5 – +35°C+5 – +35°C
Application Duration (Pot Life)4 Hours (at 23°C, 50% Relative Humidity)
Colour/appearanceGrey /granule
Packaging20 kg ±10% bagged dry product
Reaction to FireA1 EN 13501 – 1

Check out the other products in this Thermal Range: Insulating Plaster/Render, Silicon Enhanced Mineral Render, Universal Acrylic Primer.

ProofTherm Lightweight Insulating Screed is supplied to site in convenient 20 kg – 40lt ±25 bagged dry product.

Floor Screeds & Compounds from Smet Building Products Ltd have been used throughout Europe for over 30 years. Our comprehensive portfolio includes Calcium Sulphate Based Screed Binders, Self Smoothing Calcium Sulphate Based Screeds & Compounds, Cement Based Screed Binders and Self Smoothing Cement Based Screeds, Lightweight Flowing Screeds, LiteFlo Compounds for Domestic, Commercial, Industrial and Design use. The SMET Screed range has a Floor Screed solution for any building requirement.