High-Performance Soundproof Underlay

DeciBloc® 22/23

High-Performance Soundproof Flooring Solution for Residential & Commercial Buildings

DeciBloc® has been engineered from Recycled Rubber to Reduce Impact Noise, Improve Acoustic Comfort, and Deliver Long-Lasting Flooring Performance

Pre-Routed Fibre Cement Boards Designed for Effortless 12mm UFH Pipe Installation and Superior Thermal Performance

Description

DeciBloc® Acoustic Underlay is a sustainable, high-performance solution designed to significantly reduce the transmission of impact sound and footfall noise across a wide range of flooring systems. Manufactured from environmentally friendly recycled tyre rubber and formed through high-temperature hot pressing, this underlay combines durability, acoustic performance, and eco-conscious design.


Tested by independent accredited laboratories, the DeciBloc® Acoustic Underlay has been proven to deliver superior impact sound reduction, making it suitable for both residential and commercial projects where acoustic comfort is a priority. It can be installed directly under screed or gypsum concrete and is compatible with concrete, steel, and timber constructions.


The material is mould, bacteria, fungi, and water-resistant, ensuring long-lasting performance even in demanding environments. Its robust design will not fail under high point loads, while the easy-to-roll format ensures fast installation on site. Backed by an IIC acoustic performance report, DeciBloc® Acoustic Underlay is a trusted choice for architects, contractors, and developers looking to meet acoustic regulations and improve building comfort.


Our professional team are here to help you with any questions.

A green shield that says non-combustible and euroclass

Key Features


Standard Sizes

Dimensions:

1,000mm*20,000mm*3mm

1,000mm*10,000mm*5mm


Product Type

Roll


Performance

3mm - 22dbΔLw

5mm - 23dBΔLw

Support for Your Project

Have a technical advisor get in touch to discuss your needs and work out a suitable, effective solution for you. Get a quote, our experts are here to help you find the best solution for your project. Call us today: +44 (0) 208 050 5302 or send an email to support@cembloc.com

Advantages Of Use.

  • Superior acoustic performance – independently tested to significantly reduce impact and footfall sound
  • Sustainable material – manufactured from environmentally friendly recycled tyre rubber
  • Moisture and microbial resistant – protects against mould, bacteria, fungi, and water ingress
  • Strong and durable – will not fail under high point loads, ensuring long-lasting reliability
  • Easy to install – supplied in convenient rolls or sheets that lay flat and roll out quickly
  • Versatile compatibility – suitable for use under screed, gypsum concrete, and a variety of floor finishes
  • Fire and safety tested – compliant with building regulations and acoustic standards
  • Certified for sound insulation performance in residential and commercial buildings

Areas Of Use.

  • Residential flooring systems – ideal for homes, apartments, and high-rise residential blocks
  • Commercial buildings – offices, hotels, restaurants, and retail spaces requiring improved acoustic comfort
  • Public buildings and institutions – schools, hospitals, care homes, and community centres
  • Under screed systems – works directly beneath screed or gypsum concrete to enhance sound insulation
  • Concrete, steel, and timber constructions – versatile use across multiple building structures
  • Renovations and refurbishments – effective upgrade for existing flooring to meet modern acoustic requirements
  • Multi-storey developments – reduces transmission of noise between floors, meeting compliance standards


Downloads

A row of black buttons with pink icons on them.

Common DryBloc TG4 Questions

  • Can I Use Plywood Instead?

    No. Under British Standards BS 5385 Part 1, plywood is not a suitable substrate for the direct fixing of wall tiles, therefore when tiling onto walls, a tile backer board is required. However, tiling onto plywood overlaid floors is acceptable under British Standards. 


  • Do I need to use CemBond on the DryBloc TG4?

    Yes, CemBond Max Strength Sealant/Adhesive is necessary for all Cembloc installation guides to protect and adhere the boards in place.


  • Which way round do I lay DryBloc TG4?

    DryBloc TG4 boards should be laid with the UFH side up

  • What Is DryBloc TG4 made of?

    DryBloc TG4 is a fibre cement boards made from organic fibre, sand, cement, and water. The mixture of these ingredients is critical to produce a strong, firm, water-resistant board suitable for heavy tiles and moisture.


  • Benefits of DryBloc TG4 vs Chipboard?

    There are several reasons why fibre cement flooring may be a better choice than chipboard for flooring applications. Fibre cement is a more durable and long-lasting material than chipboard, making it unlikely to warp, crack, or break over time. It is also resistant to weathering, rot, and insect damage, making it a better choice for outdoor or wet environments. Fibre cement is also non-combustible and can be used in fire-rated applications, whereas chipboard is combustible and should not be used in fire-resistant construction. Fibre cement flooring is also available in a wider range of colours, textures, and styles, giving you more design options to choose from. Overall, fibre cement is a more versatile, durable, and reliable material for flooring than chipboard.


  • Do I need to Prime?

    Priming required after laying and pipe installation to protect pipes and optimize screed adhesion


  • How do I cut DryBloc boards?

    The use of a Polycrystalline blade is always recommended to speed up the process and efficiency.


  • What glue do I use with DryBloc TG4?

    We recommend using CemBond Max Strength Sealant/Adhesive along with Cembloc FCB screws when installing DryBloc TG4.