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  • Screed underlays

    What could be better than coming home after a long, busy day and enjoying a moment of pure quiet?
    Silence helps us unwind, recharge, and find true relaxation.

    For many years, Sapronit has been dedicated to developing advanced screed underlay solutions, focusing on how these materials effectively reduce impact noise and improve acoustic comfort.

    The range includes products such as:
    Acoustic Abrifiber®, Acoustic Foam®, Acoustic Reflex®, Acoustic Side Strip, and Acoustic Custom

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    sapronit Sous-couches pour chape

Reduce Impact Noise with Sapronit Screed Underlays

Réduction acoustique

Acoustic reduction

recyclable

100% recycable

Etanche

Waterproof

sapronit UN PARTENAIRE INEVITABLE DE SOUS-COUCHES POUR CHAPE

Properties:

Sapronit, your trusted expert in screed underlays

Impact noise occurs when vibrations travel through a building’s structure and spread into adjacent areas. Common examples include footsteps, dropped objects, or the movement of furniture such as chairs.

To minimize this type of noise, builders and designers often use a floating screed system installed over an acoustic underlay combined with perimeter edge strips. This setup ensures that the screed remains separated from the structural base layer, allowing the underlay and edge strips to absorb vibrations effectively and reduce sound transmission.

Interior foam fittings are generally made from soft PU foam or hard to semi-rigid PE foam, such as LD33, LD45, LD29, PTZ29, PTZ33, XVA45, XPE, or Multilam.

sapronit UN PARTENAIRE INEVITABLE DE SOUS-COUCHES POUR CHAPE

Product adapted to your needs:

  • The Acoustic Abrifiber® 9 mm is a three-layer acoustic underlay designed to provide exceptional reduction of impact noise between building floors. Its unique multi-layer construction, which includes a felt layer, easily exceeds the strict requirements of the current NBN S01-400-1 standard for residential buildings. A 50 mm overlap guarantees complete acoustic damping. The Acoustic Abrifiber® 9 mm achieves a sound improvement index of 36 dB when used with a foam concrete infill and 33 dB with a Betopor infill. Unlike many other underlays, it is fully compatible with underfloor heating systems. Additionally, the Acoustic Abrifiber® 9 mm can be perforated during floor heating installation without compromising its acoustic performance.

    Properties:

    • Ultimate acoustic damping up to 36dB
    • Can be perforated for use of floor heating
    • Overlap for full coverage
    • Meets the most stringent requirements
    • Easy to install
    • Tested by Buildwise (WTCB)
    Ask about this product
  • The Acoustic Abrifiber® 7 mm is a 3-piece acoustic underlay that provides the ultimate in contact sound reduction.

    The felt layer of this product is the extra added value. This bottom layer provides ultimate sound vibration absorption. This underlay is easy to install and process. Use this product with a floating screed to achieve maximum and effective sound absorption. Sufficient attention should always be paid to the 100 mm overlap.

    Thanks to the careful composition of its 3 layers, it achieves an improvement index of 35dB for a foam concrete infill layer and 32dB for an insulation mortar infill layer.
    Acoustic Abrifiber 7® mm scores particularly high within the current standard NBN S01-400-1 for residential buildings.

    Properties:

    • Ultimate acoustic reduction up to 35dB
    • Overlap for full coverage
    • Meets the most stringent requirements
    • Easy to install and process
    • Tested by Buildwise (WTCB)
    Ask about this product
  • This screed underlay is an extruded polyethylene foam (PE) composed of 4 laminated layers of 2 mm (alternating green/white) in a density of 25 kg/m3.
    This achieves a value of 27dB.

    Thanks to the printed top with cutting lines, you can proceed carefully for optimal installation. The Acoustic Foam® 4x2 mm has an overlap of 100 mm. It can be used in combination with floor heating. As the underlay cannot be perforated, it is advisable to lay the floor heating pipes in a flexible structured floating membrane.

    Properties:

    • Acoustic reduction (27dB)
    • Printing with cutting lines
    • Budget-friendly
    • Overlap for full coverage
    • Light and easy to process
    • 100% recyclable
    • Tested by Buildwise (WTCB)
    Ask about this product
  • The Acoustic Reflex® 2x3 mm has a thickness of 6 mm consisting of 2 laminated layers of extruded polyethylene foam (grey at the bottom and white at the top) of 3 mm each in a density of 35 kg/m3 and printed with the brand name ACOUSTIC REFLEX®.

    When the height of the infill layer or screed is rather limited, Acoustic Reflex® 2x3 mm is the perfect solution. With a thickness of only 6 mm, this budget-friendly alternative achieves a value of up to 23dB. This product also features a 100 mm overlap.

    The material used is rot-proof and resistant to moisture, water vapour and has a high chemical resistance. This product can also be used in combination with floor heating. As the underlay cannot be perforated, it is advisable to lay the floor heating pipes in a flexible structured floating membrane.

    Properties:

    • Acoustic reduction (23dB)
    • Limited thickness
    • Budget-friendly
    • Overlap for full coverage
    • Light and easy to process
    • 100% recyclable
    • Tested by Buildwise (WTCB)
    Ask about this product
  • La fine sous-couche Acoustic Foam® 5-35 est idéalement adaptée à l’isolation solide contre les bruits d’impact entre les planchers porteurs et flottants à hauteur limitée.
    Ce produit est principalement utilisé si la hauteur de construction du sol est très réduite. Dans ce cas, chaque millimètre compte. Comme ce produit se compose de seulement une couche de mousse de polyéthylène extrudé (PE) de 5mm, il offre une solution efficace pour ces situations. Il est possible d’utiliser l’Acoustic Foam® 5-35 en combinaison avec un sol chauffant. Dans ce cas, nous préconisons d’installer le chauffage sur l’Acoustic Foam® 5-35.

    Les tuyaux de chauffage par le sol sont maintenus dans une membrane texturée flexible destinée à une installation flottante. L’Acoustic Foam® 5-35 ne doit pas être perforé lors de l’installation.

    Properties:

    • Very limited thickness, only 5 mm
    • Budget-friendly
    • Acoustic reduction (21dB)
    • Light and easy to process
    • 100% recyclable
    • Tested by Buildwise (WTCB)
    Ask about this product

Proper Installation of Acoustic Underlays and Side Strips

Achieving the best acoustic performance starts with the correct installation of Sapronit acoustic underlays and side strips.

Our Acoustic Side Strips are designed for vertical placement along walls, ensuring effective vibration isolation. Acoustic underlays should always be laid flat and never folded up against standing walls. For optimal results, make sure there are no seams between connected layers.

For detailed guidance, request the official installation instructions for this product.

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Sustainable & Responsible

In addition to a soundproofing function, screed underlays also have an insulating and thermal function. As we are committed to sustainability, it is important to extend this to our products.
That is why we invest in the production of products that are 100% recyclable. Last year we recovered 15,000 tonnes of waste and saved more than 25,000 tonnes of CO2.
With Abriso Jiffy’s screed underlays and Acoustic Side strips, you are helping to create a sustainable building in a sustainable world.

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We collect and sort 100% of our
group-wide production waste.

Proud to be a sustainable leader in our field, we’ve been committed to the cause from our very beginnings. From launching our world-first 100% recyclable padded bag to developing
a group-wide waste-free cradle-to-cradle’ approach, sustainability is at the heart of every decision we make.

Sustainable development

We protect.

So how exactly do we do what we do, sustainably?

Because we’re 100% committed to what we call our ‘circular economy’ and ‘cradle-to-cradle’ products – which basically means that none of our waste ends up in the incinerator or landfill. In fact, we have no waste. Everything is reused. And we do this in two main ways.

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