Karma Visco 21 Overlay Boards

The Karma Visco 21 Overlay Boards are ideal for use in refurbishment projects which require additional floor height on top of an exisiting subfloor, in addition to exceptional acoustic performance. If you are a DIYer, please contact our team for soundproofing help and advice.

Impact Rating

Rated at 56 dB

Airborne Rating

Rated at 49 dB


21 mm


Covers 0.72m2


13 kg


£39.99 /

inc VAT


£33.32 /

ex VAT
Actual Area (sq m) 0.72
Total Price £23.99

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Product Description

Karma Visco 21 overlay boards are high-performance acoustic floor panels which provide exceptional acoustic performance. They are particularly suited towards renovation projects which already have an existing subfloor or floor joists in place, with requirements for acoustic performance and additional floor height.

Karma Visco 21 overlay boards are comprised of 4 individual elements: MR MDF, Visco elastic strips, fibreboard and chipfoam. Each element plays a key role in its high acoustic performance, for example the elastic strips dampen the sound vibrations before they reach the building, reducing any airborne noise.

When testing Visco 21 in a complete flooring system including 22mm chipboard deck, 225mm solid wood joists and resilient bars, it has been deemed fit to satisfy requirements of Approved Document E.

Visco 21 is an extremely versatile product in terms of floor finishes for example the floor panels can be used in conjunction with carpet, tiling or wooden floors, however there are some floors that require more attention that other for example when applying vinyl to the acoustic floor panels the panels should be overlaid with 6mm plywood or hardboard to prevent mirroring of the joists.

• Excellent Impact and Airborne sound performance
• Low profile and high density versions available
• T&G edge profile for ease of installation
• Laid directly on the sub-floor
• Can be used with most floor finishes



The soundproofing ratings of this product are 56dB impact and 49dB airborne.

These figures aren’t a measure of the reduction that the product gives, but is the figure that you would get following a soundproofing test after fitting, on the same or a similar full floor set-up to the one used during testing (not just the product in isolation).

Please see the product specification for more details on how these figures were achieved.

Need Some Assistance?

If you need any assistance in understanding our product range, please don’t hesitate to call our customer service team on 01484 411888.

Technical Specification

Area 0.72m2
Dimensions 1.2m x 0.6m x 21mm
Thickness 21mm
Weight 13kg
Impact Noise Rating 56dB

The information given here may vary and is partly based on information from our suppliers. It represents the prevailing level of expertise and is not binding in a legal sense. The compliance of legal requirements lies within the customers own responsibility.

You can find all of the information shown here on one of our product data sheets which are in a PDF format. You can download this below.

Technical Data Sheet
Product Data Sheet


On average, this item takes 2 to 3 working days to be delivered to a UK Mainland address.

Our delivery rates are calculated on an order value basis. All standard deliveries are delivered by couriers (company variable) and can be received up to 3 to 5 working days from order (6 working days if you order after 12.30pm on a weekday).

All available delivery options for this item can be selected at the check-out and if you order before 12pm Monday to Friday, your order will be processed the same day.

Need it quickly?

We may be able to deliver this item on a next day service, please contact us to arrange this prior to ordering.


You should never book fitters before you have received your goods, we cannot be held responsible for costs incurred by yourself as a result of delivery complications and/or delays.

Deliveries are palletised and heavy, therefore our delivery services are to kerb-side only – you will be responsible for moving the goods from the roadside to the property.

Shortly after placing your order, you will receive a delivery date confirmation email. This email will detail the day of delivery which can take place any time between 8am and 6pm. If you require a more accurate time slot, please contact us prior to ordering and we’ll do our best to assist you; this could be at an additional cost.

For full delivery details, including timescales and Terms & Conditions, please click here

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