RLA Polymers

Acoustic Solutions

AKU-Tile® 4 Impact Noise Reduction (INR) System
Acoustic Felt Tiles for Impact Noise Reduction under Ceramic Tiles

AKU-Tile® 4 INR
System Components
Surface Preparation
Priming & Application
Expansion / Movement Joints
Technical Data
Test Results
Technical Data Sheet (pdf)


  • CP3 Urethane adhesive does not usually require any priming.
  • Once installed, the surface of AKU-Tile® 4 is to be primed via means of troweling a thin coat of M2P over the entire surface. This needs to be done prior to installing any Miracryl 80 bandage around the edges or installing the main waterproofing coats of M2P.


  1. Installing AKU-Tile® 4

    Protect the area to be installed from rain. Plan the area including a gap of 6mm between all upstands and the AKU-Tile® 4 for the 6mm RLA Foam Backing Rod. Once satisfied, begin the application of CP3 Urethane adhesive (refer to CP3 data sheet for further information) using a 3mm notched adhesive trowel. Take care that you do not get any excessive adhesive build up. Spread the adhesive along the shortest width of the area being installed and spread length ways approximately two AKU-Tile® 4 tile widths.  Place AKU-Tile® 4 into the wet adhesive ensuring that good transfer to the back of the tiles is achieved. Slide the tiles together so that they butt tightly together. Continue in this manner working backwards until the entire area is complete. Allow for adhesive to dry.

  2. Priming AKU-Tile® 4 Surface with M2P

    Due to the open weave nature of AKU-Tile® 4, it is necessary to prepare the surface for subsequent bonding using a thin coat of M2P. Mix the M2P as per the M2P data sheet and flat trowel a thin layer into the surface of AKU-Tile® 4. Ensure that no excess build up is left around the perimeter. If there is an edge in the floor plan where the AKU-Tile® 4 ends, the edge needs to be primed with M2P out past the tiles by at least 40mm to allow for a suitable surface for the Miracryl 80 bandage to  adhere to. As a primer coat, this layer can be less than the regular requirement of M2P coat thickness as it is for the purpose of priming only. Allow to dry (approximately 45 minutes at 21°C). Once dry, place the 6mm RLA Foam Backing Rod into the gap left between the edge of AKU-Tile® 4 and the upstands.

  3. Install Miracryl 80 Bandage

    Miracryl 80 bandage should be installed around the entire area of AKU-Tile® 4. This bandage will adhere half to the AKU-Tile® 4 and half onto the upstands. First peel the protective backing off one half of the bandage and firmly fix to the AKU-Tile® 4 over top of the RLA Foam Backing Rod directly next to the corner. Peel the other half off the bandage and carefully roll it up onto the surface of the upstands.  Ensure all bandaging has been firmly fixed to the substrate by using a small roller or similar.See Figure 1 below.

  4. Install Miracryl 2-Part Waterproofing Membrane

    Once the area has been prepared and there are no holes evident in the area to be waterproofed, start to install M2P as per the directions found on the M2P product data sheet. Ensure that the corners around the edges do not collect excess M2P. This excess should be removed by using a paint brush to work the product out of these areas. Allow product to thoroughly dry (6-8 hours @ 21°C).

  5. Install Tiles using RLA Flex 1-Part Tile Adhesive and RLA Tilesil Silicone

    For tiles up to the size of 400mm x 400mm, install the tiles using a square notch adhesive trowel of 10mm. For tiles any larger than this use a square notch adhesive trowel of 12mm. Ensure you leave a minimum gap in the corners of at least 5mm for RLA Tilesil to be installed into after grouting. This is required to ensure there is separation between the tiled surface and the upstands so as not to allow noise to travel into the upstands and shortcut the system down through the walls (see diagram on page 4). Refer to the RLA Flex 1-Part technical data sheet for further information on using this adhesive.


Our technical advice for use, whether oral, written, or in tests, is given with our best knowledge. It is an indication only and does not involve our responsibility. Values are given as examples and may not be regarded as specifications. As we are not able to monitor product use and given the numerous materials and possible uses, users must perform the necessary tests to verify that the product is suitable for the intended use. Users are responsible for complying with the local legislation and for obtaining any required approvals or authorizations. Users of our products are invited to contact our departments to obtain current versions of technical data sheets and safety data sheets.
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Address: 24-28 Lady Ruby Drive, East Tamaki, Auckland. PO Box 64207, Botany, Auckland 2163, New Zealand.