Monarfloor Wall Cap 400

Acoustic isolation and energy insulating system for separating party cavity walls within traditional multi-rise developments.

Monarfloor® Wall Cap 400 isolates the load-bearing leaves from the precast floor plank, reducing the acoustic flanking sound transmission within the structure. Monarfloor Wall Cap 400 also ensures the integrity of acoustic treatments for party walls and floors.

Monarfloor Wall Cap 400  

Features & Benefits

  • Isolates the precast floor plank from the load bearing party wall.
  • Reduces the flanking sound transmission energy within the structure.
  • Superior acoustic isolation and damping performance.
  • Can be used as an isolator / innovative flanking detail with any acoustic flooring treatment.
  • Easily installed within current standard wall constructions.
  • Significantly improves the acoustic isolation of the building when used in conjunction with other Monarfloor® acoustic systems for party walls and floors.
  • Ensures the robustness of other acoustic systems for party walls and party floors.
  • Demonstrates a significant cost saving and flexibility in the design and build of the building.
  • Surpasses performance requirements of Approved Document E of the Building Regulations.
  • Can be used to improve the acoustic performance and gain credits towards The Code for Sustainable Homes.
  • 3-4 cost-neutral credits for the code for Sustainable Homes when used with other Monarfloor acoustic systems based on PCT test evidence (200mm floor planks required for 4 credits).
  • Effective Edge Sealing as Defined in ADL1A (2010).
  • Product Range

    Product Code Description Dimension Weight (approx) Unit of Sale
    2003748 Monarfloor Wall Cap 400 3.8mm x 400mm x 8m 16 Kg Per Box

    Note: Monarfloor Wall Cap 400 kit comprises of 1 roll of Wall Cap membrane and 30 Wall Cap clips) 

  • Product Data and Performance

    Performance Data:

    Wall Cap Membrane – Bitumen composite with acoustically rated fillers and fire retardant.

    Wall Cap Clips – Structural grade galvanised steel.


    Wall Cap Membrane – 400mm wide x 8m long x 3.8mm thick rolls.

    Wall Cap Clips – 15mm wide x 104.9mm long x 75mm deep

    Weight/Kit: 16kg
  • Installation Video

  • Installation Guide

    Monarfloor® Wall Cap 400 System installed on a cavity wall.

    Monarfloor® Wall Cap 400 System installed on a cavity wall 

    1 Monarfloor® Wall Cap Clips   3 Precast Floor Planks
    2 Monarfloor® Wall Cap 400 Membrane  


    Monarfloor® general detail showing 3-4 credit solution for the Code for Sustainable Homes (using 200mm precast planks).

    Monarfloor® general detail showing 3-4 credit solution for the Code for Sustainable Homes (using 200mm precast planks)

    1 Monarfloor® Bridgestop® System   3 Monarfloor® Wall Cap Clips
    2 Monarfloor® Tranquilt® System   4 Monarfloor® Wall Cap 400 Membrane


    Installation at a glance

    • Build the load-bearing party walls to the desired height.
    • Locate Wall Cap clips equally at approximately 600mm centres on both masonry leaves along the length of the party cavity wall.
    • Roll Wall Cap 400 membrane over the full length of the prepared cavity wall, return the overhangs down the face of the masonry blocks and clip into the Wall Cap clips.
    • For jointing and detailing, butt the Wall Cap membrane tight and locate further Wall Cap clips at these junctions. Wall Cap 400 should be used for cavity walls and Wall Cap 200 for flanking walls.
    • Once the floor planks are fully installed, proceed to build the party and flanking walls.
    • All wall /floor junctions must be isolated in the same manner as the build continues upwards.
    • Wall Cap 400 membranes can be overlapped where necessary.

    For optimum acoustic isolation, the party cavity wall should have 
    Monarfloor® Bridgestop® built in at every storey and flanking walls isolated from the precast floor slab with Monarfloor® Isolation Strip.

  • 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 Wall Cap 400 System (ICO1813)


    Installation Guides

    download pdf Wall Cap 200 & 400 Installation Instructions (ICO2151)
  • 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


This site uses cookies in accordance with our Website Privacy Policy. By continuing to browse the site you are agreeing to our use of cookies. To browse without the use of cookies, you can opt-out as explained in our Website Privacy Policy or adjust your cookie settings for your browser

Monarfloor Acoustic Flanking & Acoustic Floating Floor Systems