The laying procedure for floating wooden flooring or dry installation, which is done without glue, is increasingly popular thanks to its ease and efficacy.
Isolmant, which is fully committed to market development and has a strong expertise in the sector, has developed complete range of products that are specifically used to install floating wooden and laminate floorings. Thanks to their mechanical, acoustic and thermal characteristics, these products are designed to meet the requirements of different environments with a wide range of applications.


  • The range consists of 17 products to provide effective solutions to the main issues with floating installation.
  • Technical characteristics are certified by the main European laboratories.
  • Product accessories and details have been designed to reduce floor-laying time.
  • Packaging and product design is for easy storage and transportation.
  • Isolmant’s Technical Department supports professionals who need to design dedicated solutions.

A new European standard UNI CEN/TS 16354 was issued in January 2014. This standard concerns the characteristics of the materials to be installed under wooden and laminate floorings and sets out the test methods to determine the technical characteristics of the underlays and the basic efficiency
requirements of the underlay-flooring system by means of performance indicators. Thus, this standard becomes an important reference point to choose the most suitable product for the needs of each customer.
Not only does this standard qualitatively list the technical characteristics that the underlays should have but it also describes the test methods by providing the criteria to compare the different products on the market. It also provides a performance classification system of the most important indicators.

Tecnasfalti Isolmant’s R&D laboratory anticipated the demand for clear and unambiguous technical specifications for substrate products by carrying out a wide number of acoustic, mechanical and thermal tests during preliminary studies and development of new materials. With the introduction of the new standard, it has been possible to link a performance classification to the laboratory value.

The characteristics of the underlay


IS: Impact Sound (transmitted sound)
Sound insulation is assessed by means of laboratory test. This test consists of measuring the impact sound which is transmitted by a structure before and after inserting the underlay. The ΔLw indicator defines the variance between the two test phases. The higher is the ΔLw value, the better the acoustic insulation class (IS0 to IS2).

RWS: Reflected Walking Sound Insulation (reflected sound)
This indicator defines the level of reflected sound generated by floating wooden or laminate flooring in case of an impact source (such as footsteps).
This value is measured in Sone; the lower the value in Sone, the better the acoustic class of the underlay (RWS 0 to RWS 3).

CS: Compressive strength
The system consisting of floating flooring and acoustic insulation should ensure suitable compressive strength. In fact, when the flooring is subjected to static loads (such as tables, chairs, bookshelves), the gripping rods and the connection system should not bend excessively, leading to breakage. The higher the pressure (in kPa) required to reach the established bending (0.5 mm), the better the compressive strength class of the underlay (CS 0 to CS3).

CC: Compressive Creep
In addition to the compressive strength of the insulating material in case of static loads, it should be considered also the creep that the floor undergoes over time in case of long-term static loads. This is the compressive creep (or creep). The higher the strength (in kPa) required to get to a bending higher than 0.5 mm, the better the compressive creep class of the underlay (CC 0 to CC 3).

DL: Dynamic Load
Another important characteristic of wooden flooring underlays is the longterm resistance in case of cyclic load, such as continuous footstep stress on the flooring of gyms or public areas. The higher the continuous footstep stress level at an established strength, which is required to impact the underlays, the better the dynamic load class (DL0 to DL2).

RLB: Resistance to Large Ball
The acoustic insulation material used for the underlays should have characteristics such that the quality of the flooring can be maintained in case of large objects falling. The higher the distribution of the impact energy, calculated in mm, the better the large ball resistance class of the underlays.

PC: Punctual Conformability
This indicator defines the underlay capacity to absorb any small unevenness of the substrate. The comformability class of the material rises (from PC 0 to PC 3) with an increasingly softer and thicker underlay.

R: Thermal Resistance
The acoustic insulation is thin therefore it can provide limited flooring thermal insulation, but it can have a role in reducing the “cold flooring” effect by protecting the wood from an excessive temperature leap. Its low thermal resistance makes the underlay suitable for hot/cold water underfloor water heating/cooling. It is recommended to check that Rt (finishing) + Rt (Isolmant layer) ≤ 0.15 m2K/W (in case of underfloor heating) and Rt (finishing) + Rt (Isolmant layer) ≤ 0.12 m2K/W (in case of underfloor cooling).

SD: Vapour Resistance and Moisture Barrier
If it is necessary to protect wooden or laminate flooring from moisture, it is recommended to install a high quality proofing barrier against vapour diffusion. This feature is expressed by the Sd indicator and it is measured in meters. The higher the Sd value, the better the Water Vapour Diffusion resistance class of that material. The recommended value in case of moisture is: Sd > 75 m.

RTF: Reaction to fire
This indicator defines the level of participation of a flammable material in case of fire. That characteristic is regulated by the Fire Classification for construction products and buildings elements according to the UNI EN 13501-1. The reaction to fire test for wooden flooring underlays checks the rate of fire propagation and the intensity of the smoke. The minimum class required for public places is Bfl-s1, that means an auto-extinguish material that does not develop toxic smoke.