JCW Overfloor Premier Plus System

This simple to install overlay soundproofing system for existing floors is specifically designed to absorb and reduce both airborne noise, like loud conversation or music from next door and impact noise which is caused by things like footsteps or furniture being moved about.

Because it is so effective and you don’t have to remove the existing subfloor, it’s a popular acoustic upgrade solution in homes, flat conversions and apartment blocks where there is a need to prevent noise intrusion through floors or from noisy neighbours.

The system involves the addition of a “floating floor” by overlaying three sound insulation products in separate layers, loose laid or bonded, to the existing subfloor.


About the JCW Overfloor Premier Plus Soundproofing System

The JCW Overfloor Premier Plus Soundproofing System comprises three different layers of highly effective sound insulation products which are used in combination to yield impressive results.

Once the existing floor covering has been removed to reveal the subfloor layer, each of the separate soundproofing products is added as a “floating floor” in the following order:

  •  first a layer of 2mm thick JCW Weight Enhanced Barrier Mat which has a density of 5 kgs per square metre is bonded to the  exposed subfloor
  •  secondly a layer of 5mm thick JCW Impacta Rubber is bonded on top
  •  finally, for additional mass and rigidity, a layer of 22mm thick high density JCW Cement Particle Board is laid and bonded on top

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Technical Specifications

System summary and benefits

  • Convenient as the floating floor is laid on the existing subfloor so there is no need to lift the existing floorboards or subfloor
  • Effective high performance system with excellent impact and airborne sound reduction, especially under a final floor finish like timber laminate or solid timber
  • Simple to apply and easy to handle
  • Versatile and can be used equally effectively on timber and concrete floors
  • Robust and durable made from high density mineral loaded polymer
  • Fire retardant
  • Eco friendly using 100% recycled material
  • Flexible as it can be used with every type of final floor finish including carpets, vinyls, wood laminates and engineered solid timber floors

Products Summary:

JCW Weight Enhanced Barrier Mat

Mean Sound Reduction Index

Product Size/Weight Options
Roll/Sheet Coverage
JCWB 5 2.0 5.0 2mm x 1200mm x 5m roll 6.00 m2


Composition: High density polymer with mineral loaded filler
Flammability (FMVSS 302): Zero burn rate
Tensile strength: BS 2782: Part 3: 1976: 5.75N.mm2 2.6Mpa
Composition: Bonded recycled rubber granulate

JCW Acoustic Impacta Rubber

Product Size Thickness Roll Size Roll Weight
JCW Impacta Rubber 5mm 5mm x 1000mm x 10m roll 10.00 m2


Acoustic Performance

Product Impact Performance Airborne Performance
JCWB 5 54 dB 5.0

JCW Acoustic Cement Particle Board


Composition: Cement particle impregnated chipboard

Product Thickness Sheet Size Sheet Weight
JCW Cement Particle Board 22mm 22mm x 600mm x 1200mm 12.80 kgs

At a glance guide to help you calculate what you will need for the JCW Overfloor Premier Plus Soundproofing System

You can quickly work out how much soundproofing products and ancillaries you’ll want if you use this at a glance guide to calculate things. Check the square metre dimensions of the area to be treated and apply to the tables below. Where the initials TBD are shown, please discuss details of your installation with our advisor in order to calculate exactly how much you will need, depending on the nature of the construction.

Floor Area
JCW Weight Enhanced Barrier Mat (1 Roll covers 6m2) JCW Impacta Rubber (1 Roll covers 10m2) JCW Cement Particle Board (600mm x 1200mm sheets) JCW Ancillary Products
3 1 Roll (6.0 m2) 1 Roll (10.0 m2) 5 TBD
4 1 Roll (6.0 m2) 1 Roll (10.0 m2) 6 TBD
5 1 Roll (6.0 m2) 1 Roll (10.0 m2) 7 TBD
6 1 Roll (6.0 m2) 1 Roll (10.0 m2) 9 TBD
7 2 Rolls (12.0 m2) 1 Roll (10.0 m2) 10 TBD
8 2 Rolls (12.0 m2) 1 Roll (10.0 m2) 12 TBD
9 2 Rolls (12.0 m2) 1 Roll (10.0 m2) 13 TBD
10 2 Rolls (12.0 m2) 1 Roll (10.0 m2) 14 TBD
12 2 Rolls (12.0 m2) 2 Rolls (20.0 m2) 17 TBD
15 3 Roll (18.0 m2) 2 Rolls (20.0 m2) 21 TBD

Ancillary Products

Soundproofyourhome supply the following products to enhance the acoustic integrity of the installation:

  • JCW Acoustic Sealant and Applicator Gun
  • JCW Impacta Adhesive
  • JCW Spray on Contact Adhesive
  • JCW Waterproof PVA Adhesive

DIY Installation Guide for the JCW Overfloor Premier Plus Soundproofing System

Incorrect installation techniques and materials can compromise the integrity of any acoustic solution. Please follow this general guidance to avoid any incorrect installation which could have an adverse effect on acoustic performance.

  • Step 1: Remove all existing floor coverings. Because this system will add around 3cms to the floor height, we also recommend that all skirting boards are also removed from around the area to be treated and either replaced afterwards, if not damaged in removal, or alternatively replaced with new skirtings as part of a decorative upgrade
  • Step 2: If the revealed timber floor is a suspended floor (not tongue and grooved floorboard), check by inserting a thin bladed knife or screwdriver through the gap: if the knife goes through easily without resistance, the floor boarding used will be “butt” or “square jointed”. This gap will firstly need to be sealed with JCW Acoustic Sealant to avoid noise leakage through and into/out of the room. This must be done before proceeding to lay JCW Weight Enhanced Barrier Mat. This Step 2 is not relevant if the floor to be treated is concrete or the existing floor is tightly fitted tongue and groove floorboard.
  • Step 3: Roll out the JCW Weight Enhanced Barrier Mat, cut and fit as appropriate. It can be loose laid or glue bonded to the subfloor if you prefer. Make sure the edges are butt jointed as tightly as possible.
  • Step 4: Now unroll the JCW Impacta Rubber wall to wall across the entire floor. Because this product stretches slightly when it is rolled up it should be unrolled and left for approximately 8 hours to condition to its environment before it is measured or cut. When it is ready, use a straight edge to tightly trim the edges with a sharp craft knife in order for them to fit as closely as possible to the wall. The JCW Impacta Rubber can be loose laid over the JCW Weight Enhanced Barrier Mat using or can be glue bonded if you prefer.
  • Step 5: Now begin to lay the JCW Cement Particle Board. Care must be taken when handling these as they are relatively heavy. Also make sure to remove any tongues and grooves from the edges of the JCW Cement Particle Board where it meets the perimeter wall, in order to ensure the tightest possible fit. Start by placing the first board in one corner, with the previously grooved edge (which has now been removed) and glue each joint with the adhesive as you go along. Be sure to leave a 5mm gap between the edge of the board and where it meets the wall the wall. When all the boards have been laid, this gap is in-filled with JCW Acoustic Sealant to provide an acoustic barrier between the board and the wall.
    Because of the hard and robust composition of these boards, they should be cut using an appropriate tungsten or diamond tipped saw. If you use a jig-saw, always select a metal blade. Any boards withdamaged tongues can be saved for the cutting in of the final row of boards, when any damaged edges can be cut off as part of the off-cut process.
  • Step 6: To ensure the acoustic integrity of your project, fill any remaining gaps at the edges where the boards meet the wall, or between the boards, with JCW Acoustic Sealant
  • Step 7: When re-fixing the skirting boards, leave a small gap, around 2mm at most, between the JCW Cement Particle Board and the re-positioned skirting. This gap should be filled with JCW Acoustic Sealant which will prevent any flanking sound transferring through the wall to the new floor.
  • Step 8: A final floor finish can be laid once all sealant has cured. Carpet can be installed as normal, using gripper rods at the edges and carpet underlay for enhanced acoustic performance. Laminate flooring can be installed or engineered flooring which should be spot bonded with JCW Waterproof PVA Adhesive and secret nailed to the JCW Cement Particle Board.

Note: Prior to work, JCW Cement Particle Board should be stored flat (in a weathertight environment) and never on edge or upright which could lead to dameage to the corners, the tongues and grooves, or warping. Adhesives: Before using any adhesives or other bonding materials to fix your choice of final floor finish to the JCW Cement Particle Board, please refer to the manufacturers recommendations and guidance. Use only those products recommended by the manufacturer that are considered suitable. When in doubt, contact the manufacturer.

If you require any additional help or advice regarding the installation process, please contact one of our Sales Advisors who will be delighted to help.

Professional Installation Service available

For customers who need or prefer it, Soundproofyourhome offers a professional acoustic installation service across the UK.

Our skilled and experienced tradesmen understand acoustic materials and how to fit them quickly and correctly.

The result is a cost effective service and peace of mind about the acoustic integrity of your project. Contact us today for a free quotation.

Soundproofyourhome is the domestic market operations division of JCW Acoustic Supplies Ltd, the UK’s leading manufacturer and distributor of soundproofing, sound insulation and sound absorbing products.

Sound advice from Soundproofyourhome:

Contact us today and tell us more about the noise problems you are experiencing. Our friendly, helpful advisors will offer you the most appropriate acoustic solutions available to meet your acoustic needs and budget from our comprehensive range.

We believe talking about your situation and offering sound advice based on our vast experience in the acoustics business is a more reliable way of solving your noise problem than simply taking your order or selling “off the screen”, as some companies do.

And if you are in any doubt about issues associated with soundproofing, like weight of materials, structural strength or meeting Building Regulations, then please talk to us – we’ll be happy to help.