Monarfloor Tri-Deck - Direct To Joist Acoustic Floating Floor System

Resilient overlay platform / floating floor direct to joist system.

Monarfloor Tri-Deck is designed to reduce sound transmission through timber floors where the existing timber floor will be removed but access to work on the ceiling below will be restricted.

When installed as part of a complete sound reduction system it enables a timber floor to meet the sound transmission regulations of Part E.

Monarfloor Tri-Deck consists of a 5mm layer of foam rubber bonded to an 8mm layer of LRAC foam type I bonded which is then bonded to 22mm V313 P5 moisture resistant chipboard.

Monarfloor Tri-Deck System 

Features & Benefits

  • Direct to Joist Application.
  • Applications for existing timber floors.
  • No need for an acoustic ceiling.
  • Supports floor loadings as defined in BS EN 1991-1-1:2002 +A1 2010 (Eurocode 1) which stipulates floor loading of 2 kN.
  • BBA Certified.
  • Flame retardant.
  • Superior performance – the recycled Low Resonance Acoustic Chip (LRAC) foam used has excellent impact improvement characteristics and superior stability within a single layer.
  • Product Range

    Product Code Description Dimension Weight (approx) Unit of Sale
    3003303 Monarfloor Tri-Deck 35mm x 600mm x 2400mm 30.5 Kg Per Sheet
  • Product Data and Performance

    Performance Data:
    Composition: 5mm layer of foam rubber bonded to an 8mm layer of LRAC foam type I bonded which is then bonded to 22mm V313 P5 moisture resistant chipboard.
    Board Size: 2400mm x 600mm
    Thickness: 35mm
    Board Weight: 30.50kg (nominal)
    Weight/m² 21.18kg (nominal)
    DnT,w: 55dB
    DnT,w + Ctr: 46dB
    L’nT,w: 56dB

    Performance based on PCT test evidence

    Integration With Underfloor Heating:
    Application: Floating Floor.
    Subfloor: Timber direct to joist
    Underfloor Heating System: Electric Mat
    Application: Lay over chipboard deck, then apply floor finish
    Effect on heating performance: None
    Notes: For Monarfloor Floating Floor Treatments, Underfloor Heating Systems should be laid over the Acoustic Floating Floor.

    Monarfloor LRAC foam's for most densities has a thermal conductivity of 0.034 W/mK.

    Any Electric Underfloor Heating System must comply with the BSI 17th Edition IEE Wiring Regulations.

    All Underfloor Heating Systems must be installed in accordance with the manufacturers details.

    Any Underfloor Heating System detail must follow Monarfloor's guidance.
  • Installation Guide

    Monarfloor® Tri-Deck platform floor / floating floor system over timber joists.

    Monarfloor® Tri-Deck over timber joists 

    1 Monarfloor Flanking Band – reduces impact vibration transmission via party and flanking walls and assists in reducing airborne sound paths.
    2 100mm 45kg/m³ insulation.
    3 22kg/m² double boarded ceiling on 200 x 50mm timber joists at 300mm centres.
    4 Monarfloor® Tri-Deck system


    Installation at a glance

    • Flank all perimeter with Monarfloor® Flanking Band.
    • Level the sub-floor to the required tolerance.
    • Lay Monarfloor® Tri-Deck platform floor / floating floor system directly over the floor joists in a broken bond pattern with all joints supported and glued..
    • Install skirting and trim off excess Flanking Band.
  • Downloads - Datasheets & Product Information Sheets

    On this page you can download our information and documentation in one place. Click on any of the acrobat icons below and the brochure will start to download.


    download pdf Monarfloor Acoustic Systems - Product Guide (ICO2833)
    download pdf Monarfloor Acoustic Systems - Product Guide - Republic of Ireland & Northern Ireland - (ICO3036)
    download pdf  Monarfloor Acoustic Systems - Mini Guide (ICO2833)
    download pdf Monarfloor Acoustic Systems - Price List
    download pdf Monarfloor 4 Credits Solutions (ICO1890)


    Product Information Sheets

    download pdf Monarfloor Tri-Deck platform floor / floating floor system (ICO2044)


    Installation Guides

    download pdf Monarfloor Structure Deck & Tri-Deck - Direct To Joist Installation Guide (ICO2081)


    Test Reports & Assessments

    download pdf BBA Certificate 99/3600 Monarfloor Tri-Deck
  • Related Products

  • Contact Us - Technical & Specification Support - CPD's

    Icopal Monarfloor has a dedicated field service, with a network of technical advisers throughout the UK & Ireland, available to provide technical support and bespoke specifications to meet your exact project requirements.

    Our advisory service for specifiers and contractors is free of charge. Our technical advisers are available at any time during working hours to answer queries on any aspect of building acoustics design.

    Click here to find a local Icopal Technical Adviser

    Click here to request a bespoke specification for your project 

    Want to know everything about soundproofing?
    Our CPD seminars provide an insight into the world of acoustics and more.

    Click here to find out more about the CPD's available

    Alternatively our head office technical support team can be contacted on:

    0161 865 4444


Contact Us

To discuss your project in more detail please;

Contact your local area manager
Want to know everything about soundproofing?
Book a Monarfloor Acoustics CPD

Or contact us

Technical Support


0330 123 4585



Sales Enquiries & Orders


0843 224 7400


0843 224 7401


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Monarfloor Acoustic Flanking & Acoustic Floating Floor Systems