Monarfloor Bridgestop

Acoustic Isolation System for Party Walls on Raft Foundations or a Continual Slab.

Monarfloor Bridgestop isolates both masonry leafs from each other, preventing an acoustic bridge by the collection of mortar at the base of the cavity. Monarfloor Bridgestop also isolates the party walls from the concrete sub-floor, reducing acoustic flanking, and improving the damping.

Where used with a gas or radon barrier, Monarfloor Bridgestop will ensure the integrity of the barrier from possible damage from mortar droppings.

Monarflex Bridgestop Flanking system for Acoustic Isolation System for Party Walls on Raft Foundations or a Continual Slab.

Features & Benefits

  • Isolates the two leaves of a cavity party wall preventing an acoustic bridge.
  • Isolates party walls from flanking sound transmission.
  • Superior acoustic isolation and damping performance.
  • Can be used as an isolator for steel where a party or flanking wall is to be built off it.
  • Prevents damage to methane and radon barriers.
  • Permits the use of a continual slab between dwellings and within multi rise separating floors.
  • Facilitates easy detailing for steps and staggers.
  • Demonstrates a significant cost saving and flexibility in the design and build of the development.
  • Surpasses performance requirements of Approved Document E of the Building Regulations.
  • Specified within Robust Details Appendix A2 (as of August 2008).
  • The system can be used as part of a number of Robust Detail walls without affecting the credits already available (Appendix A2).
  • Specified within Robust Details E-WM-19 as a proprietary wall for attached houses. Provides 4 credits for the Code for Sustainable Homes & Home Quality Mark HQM 

  • Product Range

    Product Code Description Dimension Weight (approx) Unit of Sale
    2003601 Monarfloor Bridgestop System Kit 500mm x 3mm x 8m 19.7 Kg Per Box

    Note: Monarfloor Bridgestop System Kit comprising 1 roll of Bridgestop Membrane, 2 rolls of Bridgestop Quilt and 40 Bridgestop Ties (Flanking Band required as separate order). 

  • Product Data & Performance

    Performance Data:
    Composition: Bridgestop Quilt – reconstituted polyetherpolyurethane.
    Bridgestop High Performance Acoustic Membrane
    Thickness: Bridgestop Quilt – 10mm
    Bridgestop High Performance Acoustic Membrane – 3mm
    Weight/Kit: 19.7kg
    DnT,w: 64dB
    DnT,w + Ctr: 56dB

    Typical values based on 100mm cavity  

  • Installation Video

  • Installation Guide

    Bridgestop® System – Raft Foundation

    (other applications are acceptable, please contact Monarfloor® Technical Services).


    1 Monarfloor® Flanking Band – reduces impact vibration transmission via party and flanking walls and assists in reducing airborne sound paths (not supplied in system kit)
    2 Bridgestop® Tie.
    3 10mm Bridgestop® Quilt
    4 3mm Bridgestop® High Performance Membrane

    Installation at a glance

    • Ensure the sub-floor is suitably prepared.
    • Roll out a continuous layer of Bridgestop High Performance Membrane over the suitably prepared sub-floor, making sure it is centred within the line of the wall.
      For jointing and detailing with any gas barrier please contact Monarfloor Technical Services.
    • Build, full length, both party wall leafs up to one block course high.
    • Bed the first Bridgestop Tie in position within the mortar bed, close to start of the wall.
    • Continue bedding the Ties in at approx every 450mm centres.
    • Roll out the first layer of Bridgestop Quilt in the cavity between the two wall leafs ensuring that the bottom edge of the Quilt returns across the cavity and that the top edge of the Quilt covers the first block joint.
    • Fix the Quilt in position by pushing it onto the ties, ensuring it penetrates the Quilt.
    • Build the second course and install the second layer of Bridgestop Ties and Bridgestop Quilt by repeating the above process.
    • Lock the Ties in position by pushing the Tie Locking Caps over the open ends, cut excess Tie flush with the Locking Cap.
    • Once Quilt is fully installed complete the build of the party wall.


    For full details refer to our Bridgestop® Installation Sheet 

  • 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 Bridgestop (ICO1755)


    Installation Guides

    download pdf Bridgestop Installation Guide (ICO2152)


    CAD Library

    download pdf Bridgestop - Generic Raft Model (Bridgestop system with typical insulated screed over continual raft (ICO1378)
    download pdf Bridgestop - Generic Stepped Raft - Bridgestop system with Isover RD35 party wall over Insulab raft
    download pdf Generic Party Wall / Party Floor detail - CfSH 3 Credit System (ICO1998)


    CE - Declarations of Performance

    download pdf Monarfloor Bridgestop Acoustic Membrane DoP (TDS1187)
  • 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