Composite material multilayered membrane with sound insulating and sound absorbing to mitigate impact noise

Abstract

The composite material multilayered membrane of the present invention is sound insulating and sound-absorbent, acting as sound deadening insulation for noise impacts, mainly but not exclusively to be used in flooring, and in particular under the slab in floating floors, with the aim of reducing the transmission of noise into the below room. This membrane includes several layers, which include at least one polymeric monofilament three dimensional mat, at least one resilient mat, and at least one topping layer of waterproofing, breathable or not, tissue. This multilayered membrane with a thickness under a weight of 2 kPa of at least 8 and maximum 15 mm, preferably 10-12 mm, so as to achieve a normalized noise level in the disturbed room Lnw below 50 dB, or an impact insulation class of at least 60 points.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]Not applicable.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not applicable.NAMES OF THE PARTIES TO A JOINT RESEARCH AGREEMENT[0003]Not applicable.INCORPORATION-BY-REFERENCE OF MATERIALS SUBMITTED ON A COMPACT DISC[0004]Not applicable.BACKGROUND OF THE INVENTION[0005]1. Field of the Invention[0006]The invention relates to a composite material multilayered membrane, which acts as sound insulating and sound absorbent barrier to mitigate impact noise in construction, more particularly in floating floors construction.[0007]2. Description of Related Art Including Information Disclosed Under 37 CFR 1.97 and 37 CFR 1.98.[0008]Definitions. The term “floating floor” indicates a floor formed by a floating, at least 1 inch thick, slab, resting on top of a generally elastic panel which separates it from the subfloor, in order to form an oscillating system which absorbs the impact energy. The term “impact noise” refers to:[0009]...

AI Technical Summary

Benefits of technology

This patent describes a new invention of a sound-insulating and sound-absorbent membrane that can be used to reduce the transmission of noise in buildings. The membrane is made up of several layers, including a polymeric monofilament mat, a resilient mat, and a topping layer of waterproofing or breathable material. The membrane has a thickness of at least 8 mm and is designed to achieve a normalized noise level in the disturbed room below 50 dB. The membrane can be used in flooring, especially under slabs, and is effective in insulating against impact noise. It also has good thermal insulation properties and can be installed without the need for additional materials or instructions. The membrane is relatively compact and cost-effective.

Problems solved by technology

The opinion of the applicant is that the above described devices unlikely meet the requirements to achieve an optimum level of acoustic comfort.

More in detail, the above described solutions, while suitable to contain the impact noise level in the disturbed room to values lower than 70 dB, in the opinion of the applicant, those solutions are sufficient in itself to reduce the intensity of the noise levels prescribed by legislation; however, the solutions are not sufficient to reduce it at levels lower than 55 dB, which correspond to an optimum acoustic comfort.

As to the products used directly under the floor, there are no solutions that meet the needs of acoustic comfort.

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