Isolmant UnderSpecial BiPlus

Isolmant UnderSpecial BiPlus

Isolmant UnderSpecial BiPlus

Isolmant UnderSpecial BiPlus

High performance resilient layer made of polyethy lene Isolmant Special joined on the upper side to FIBTEC XT1 FIBRE-EINFORCED (screen printed anti-tearing fibre) and on the lowerside to FIBTEC XF3 (special needle-worked fibre produced according to specifications designed). It provides excellent impact sound and airborne insulation for horizontal partitions.


11 mm and 16 mm thicknesses available.


Isolmant UNDERSPECIAL BIPLUS is specific for floating screeds as provided by UNI 11516:2013 standards with any type of slab. As well as being suitable for use in two screed layer solutions, the fibre-reinforced top layer can also be used as FIBRE-REINFORCED top layer can also be used as a top layer which guarantees the product's high resistance to foot traffic and tearing, makes it particularly suitable for creating floating screeds in single screed layer solutions.


It requires the creation of a finishing screed at least 5 cm thick (for Biplus 11 mm) or 7 cm thick (for Biplus 16 mm).

Immagine 1


• Excellent acoustic impact sound and airborne insulation.
• Suitable for use in both renovation and new con struction.
• High resistance to foot traffic and tearing.
• Better load distribution.
• Low thermal conductivity.
• Unalterable over time.
• Unlimited durability.
• Contact with water does not affect performance or characteristics.
• Mould and insects resistant.
• Easy to lay products.
• Easy to trim: can be easily cut with a utility knife or box cutter.
• This product comes with adhesive to seal the overlap ping fabric.

Isolmant GreenPlanet

• Volatile substances free - VOC A+.
• Eco-friendly and recyclable.
• Manufactured with low environmental impact.
• Recycled contenent certified by ICMQ (report no. P492).
• Contributes to achieving credits for the environmental certification of a building according to the LEED or ITACA protocols.
• This product can be disposed of according to EWC n. 170604.
• Complies with the requirements defined by the Italian CAM Edilizia for acoustic and thermal insulation materials regarding the request for high acoustic insulation performance, the percentage of recycled material and the absence of hazardous substances.

Item Specifications

Resilient layer made of physically reticulated expanded closed-cell polyethylene, joined on the upper side with a special needle-worked FIBRE-REINFORCED tear-proof film and on the lower side with a special needle-worked fibre that is conceived to enhance the acoustic performance (Isolmant UnderSpecial Biplus type). 11 or 16 mm nominal thickness.
Dynamic stiffness s't = 9 MN/m3, s' = 23 MN/m3 for the 11 mm version (certified values) and s't = 8 MN/m3, s'= 15MN/m3 for the 16 mm version. Impact sound insulation .Lw = 35 dB and 37 dB for versions 11 or 16 mm respectively. VOC A+ (certified parameter). Recycled content certified by ICMQ. To be positioned with the screen printed fabric facing upwards. This product comes with adhesive to seal the overlapping fabric.

Item Specifications Copy item specification


Fibre-Reinforced new top layer

Isolmant BiPlus today is even more "strong" and technological. On the occasion of its twenty-year presence on the market, Isolmant's Research & Development office has studied a new release characterized by the presence in the upper layer of an innovative fiber-reinforced fabric with a honeycomb process.


This revolutionary fabric increases resistance to tearing and expansion and also improves load distribution, for a product that is even more resistant during work on site and even more performing when subjected to the load of the screed.

Fibre-Reinforced new top layer