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12mm Isocheck Impact Mat 300 Acoustic Underlay (1.2m2)

12mm Isocheck Impact Mat 300 Acoustic Underlay (1.2m2)
12mm Isocheck Impact Mat 300 Acoustic Underlay (1.2m2)
12mm Isocheck Impact Mat 300 Acoustic Underlay (1.2m2)
12mm Isocheck Impact Mat 300 Acoustic Underlay (1.2m2)
12mm Isocheck Impact Mat 300 Acoustic Underlay (1.2m2)
12mm Isocheck Impact Mat 300 Acoustic Underlay (1.2m2)
12mm Isocheck Impact Mat 300 Acoustic Underlay (1.2m2)
  • 12mm thick Isocheck Impact Mat 300 (12mm x 1000mm x 1200mm) System
  • Tri-layer impact and airborne acoustic underlay improvement system
  • Isofibre acoustic core used on stairs and under engineered timber floors
  • Reduce sound transmission through timber floors and staircases
  • Meet the sound transmission standards of Approved Document E 2003
Estimated delivery:
In Stock
£ 45.88
Ex VAT: £ 38.23
  • Brand: Isomass
  • Model: 12mm Impact Mat 300 Underlay
  • Weight: 15.02kg
  • Dimensions: 1,200mm x 1,000mm x 12mm
  • SKU: 12mm Impact Mat 300 Underlay
  • Product code: P1-3615
  • MPN: 12mm Impact Mat 300 Underlay

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12mm Isocheck Impact Mat 300 is a tri-layer impact and airborne underlay improvement system, a 12mm thick layer of Isofibre acoustic core used on stairs and under engineered timber floors.

Impact Mat 300 (12mm x 1000mm x 1200mm) is specially designed to reduce sound transmission through timber floors and staircases for conversion and refurbishment projects.

Isocheck Impact Mat 300 is a high performance tri-layer soundproofing system with an Iso-Fibre core which will provide impact and airborne improvement.

Impact Mat 300 is an ideal solution for domestic floor upgrades when looking to improve sound reduction on stairs and under engineered floors.

When installed as part of a complete party floor construction the system enables a timber floor to meet the sound transmission standards of Approved Document E 2003 and amendments.

Isocheck Impact Mat 300 will achieve up to 33dB ∆Lw in an impact performance test, and a 2 to 3dB improvement in an airborne site test (DnT,w + Ctr).

12mm Impact Mat 300 can be used over floorboards for conversions, refurbishments or listed buildings requiring minimal structural change.




Thickness: 12mm

Width: 1000mm

Length: 1200mm

Size: 12mm x 1000mm x 1200mm

Profile: Underlay Roll

Material: Isofibre


12mm Isocheck Impact Mat 300 Features:

 · Acoustic underlay.

 · 1.2m2 tile coverage.

 · 1200mm x 1000mm tiles.

 · 12mm thick underlay mat.

 · Easy to install solution.

 · Tri-layer underlay system.

 · Soundproofing matting system.

 · Used on stairs (staircases).

 · Made of Isofibre acoustic core.

 · Used under engineered timber floors.

 · Airborne and impact improvement system.

 · Designed to reduce sound transmission.

 · Acoustic solution for floor upgrades.

 · Suitable for refurbishment and conversion projects.

 · Meet the sound transmission standards of Approved Document E 2003.


12mm Isocheck Impact Mat 300 (Acoustic Underlay) Installation Guidelines:

 · Ensure the sub-floor surface is smooth, dry and free from debris and any existing floor coverings such as vinyl or carpet tiles must be removed together with any adhesive residue.

 · Secure all loose floorboards ensuring all nails and screws are driven flush and securely fixed.

 · Overlay the timber sub-floor with large sheets of ply or hardboard if the floorboards are irregular or uneven.

 · Remove any doors that open into the room being treated along with skirting if required.

 · Be aware that doors, skirting and socket height may need adjusting after the Isocheck Impact Mat 300 installation.

 · Where you intend to use ceramic tiles or vinyl as a floor finish please contact us for additional advice.

 · Roll out Impact Mat 300 directly on top of the sub-floor so that the entire floor surface area is covered and that it is butted up to or turned up where it terminates at all perimeter walls.

 · In the case of a carpet finish Isocheck Impact Mat 300 will terminate at the edge of the gripper rail.

 · In the case of a finished timber floor, the skirting should be removed and replaced once the mat has been returned on top of the finished floor.

 · Bond to the sub-floor with Isocheck Impact Mat adhesive where appropriate and butt the adjoining edges followed by standard (100mm wide) building tape.

 · Also tape the turned up edges to the wall to help with installation of a finished timber floor to receive the skirting later.

 · Apply the finish floor surface on top of Impact Mat.

 · Carpets, Timber laminate panels and vinyl coverings can be placed directly over the Impact Mat 300 with an appropriate interlayer (as selected by the flooring contractor).

 · All mechanical penetrations through the Impact Mat should be avoided e.g. A finished solid timber floor would commonly be pinned to a min. 12mm plywood interlayer.

 · Isocheck Flanking Strips provide isolation of the flooring system from all vertical structures and penetrations and should be used when a solid timber floor finish is required.

 · The Flanking Strip is trapped to the wall and returned down over the finished timber floor.

 · The skirting board is then fixed to the wall securing the Flanking Strip between the skirting board and the floor.

 · After the skirting board is installed, simply trim the Flanking Strip flush with a sharp knife.

 · Upon completion ensure the Isocheck Impact Mat 300 is protected from any mechanical damage where appropriate.

 · Please observe proper lifting methods and if transporting around the site, by hand.

 · If in doubt in any area, please call Isomass prior to commencement of work.


*Further information may be found in our Downloads section.

Fairly easy access to all PDF files.

Datasheet ǀ Declaration of Performance - DoP ǀ BBA Certificate ǀ Installation Guide ǀ Certificates ǀ Brochure ǀ SPEC Sheet 

*Special Product - Non returnable cancelable.

Handling Characteristic Protect hands
Board covarage 1.20 m2
Colour Greyish
Length 1200mm
Material Tri-layer Isofibre
Profile Straight Edge
Size 12mm x 1000mm x 1200mm
Thickness 12mm
Weight/m2 12.50kg
Width 1000mm
Fire Classification Tested to BS 5852-2:1982
Building Regulations Compatible
Finish Isofibre
Shipping method Articulated Vehicle ǀ Courier
Grade Airborne and impact improvement system
Sound insulation reduction Airbone and Impact
Applications Stairs and under engineered timber floors
Type Acoustic Underlay
Fixing method Laid, adhesive fixed
ETA Notification Yes
Features Specially designed to reduce sound transmission
Manufacturer Isomass®

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We deliver insulation materials to Mainland UK only. Deliveries to Highlands, Northern Ireland, Isle of Wight etc.. might be possible at additional cost.
We offer free delivery on most of the orders above £300 (excluding VAT) (except special products - shipping cost via courier - products marked ''Request A Quote'')

Delivery of some insulation materials might be extended due to the current situation (Covid-19, stock shortages, allocations).
If you need materials quickly please contact us - we will do our best to help you source materials needed.

We do not deliver on weekends and bank holidays. Sometimes we can deliver on Saturdays - please check with us before placing the order.
If you need any further information please contact us tel. 02081910776

We can help to calculate price per m2 or linear meter (one meter in length) cost, please just contact us via phone 02081910776, email or live chat. Alternatively, you can work it out yourself quickly and easily: to get cost per meter square please divide price shown in orange area by ''Required area (m2)'' Example price of £28.80 divided by board coverage 2.88m2 = cost of £10.00 per m2.


No matter whether you choose a local installer or a national company, there’s a few tips to help you find the right installer for your home insulation improvements, such as asking for recommendations and making sure that they’re part of a certification scheme. This makes sure that they have the right skills and standards of workmanship to carry out the installation, and you can be sure that they know exactly what they are doing.


1. Thermal inspection picture in portfolio

It’s worth seeing a installer’s previous work. There’s no harm asking if you can see any properties nearby that they’ve installed insulation in. Best way would be to see Infrared Thermal Imaging Inspections. Thermal cameras spot small, but key changes in temperature in different areas of a house, identifying problematic areas that the human eye never could and some that a visual inspection could only hypothesize.

2. Reviews

Along with checking recommendations and previous work, finding reviews online can often be a great way to find out if they provide a good service or not. However, it’s best not to solely rely on reviews you may find or review websites, as there’s no controlling who writes them.

3. Compare prices

Comparing prices will also ensure companies can’t take advantage of you and give you a fair price. 

4. Word of Mouth

The best way to find a great insulation installer is through recommendations. Make sure you ask friends and family. They will most likely give you their honest opinion and can tell you from first hand experience.


Whether you require a wall, cladding, external wall, loft or floor insulation fitted, you can find and hire your local insulation installers from popular UK web pages. A simple internet search will return thousands of potential installers near your area.



We are the stockist of construction materials and related products for both trade and DIY from most recognizable brands in the UK like Cordek, RCM, Promat, Rockwool, Isover, Celotex, Xtratherm, Ursa, Low-E, Cedral, Kingspan, Dufaylite, British Gypsum, K-rend, Ecotherm, Iko enertherm, Kay-Metzeler, Terrawool to allow you to complete your insulation job on time at competitive prices and the highest standards.


Whether you are a large company or a DIYer, if you need a large amount of insulation materials, we can offer quantity discounts at the best prices. Please contact us and our friendly customer service will try to find the best and cheapest solutions for you. We value your time and we will try to deliver the products as soon as possible at a reasonable price to your construction site or house. The UK's leading insulation supplier near you and your needs. Price List available upon request.
12mm Isocheck Impact Mat 300 Acoustic Underlay (1.2m2)
12mm Isocheck Impact Mat 300 Acoustic Underlay (1.2m2)
£ 45.88