Acoustic improvement system for metal roofing

Isocheck Quietroof

Acoustic Improvement System: for all types of profiled metal roofing

Isocheck Quietroof is a self-adhesive acoustic mass loaded vinyl designed to significantly reduce rainfall noise on metal roof constructions and offer broadband sound absorption within a space.

Quietroof’s porous structure assures a high acoustic performance by dampening the vibrational energy caused by the rain and reducing vibrations through the supporting structure into the occupied spaces below.

Quietroof is lightweight. Applying the 1mm thick, 246mm wide roll to a typical 400mm wide aluminium cladding panel will increase the overall weight by only 30%.

Quietroof is easy to install and can be factory fitted or installed on-site with minimal tools.

View more technical information and downloads

To be used on all types of roof cladding profiles in new build projects or refurbishment projects which are being fitted with a new metal clad roof.

    Solution to noise from rain on metal roof cladding

    Until recently, the lack of a common rain noise standard made evaluating the performance of a treated/untreated roofing system in a laboratory difficult. However, the methodology within ISO/CD140-18(2) (committee draft) makes quantification to a provisional standard now possible.

    The test rig

    A typical standing seam roofing system was tested to this methodology.

    The system comprised a 400mm wide, 0.9mm gauge, 3.5Kg/m2, ribbed aluminium standing seam roof with Stucco emboss.

    Five 2.1m long sections of the profiled sheets were seamed together without the usual supporting structures. 246mm wide Quietroof was applied to each of the profiled sheets, resulting in a coverage of 60%.

    This system was then resiliently mounted on a wooden frame resulting in an open test area of 3.7m2 and a pitch angle of 7º.

    The Quietroof 164mm wide strip (equivalent to 40% coverage) was also evaluated.

    The results

    An improvement of 6dB in sound intensity level (LIA) against an untreated roof was achieved in this system with the 246mm wide Quietroof.

    In addition, the linear 3rd octave band centre frequency spectra also shows an even improvement across the frequency range.

    The 164mm wide Quietroof gave improvements of 4-5dB (LIA) in A-weighted sound intensity. These results were achieved in both the ‘moderate’ and ‘heavy’ rainfall conditions (see graphs).

Standard roll sizes: 164mm wide x 1mm thick x 50m long
246mm wide x 1mm thick x 50m long
Any alternative sizes also available to order
Face Colour: Brown
Adhesive: Acrylic P.S
Flexibility: to 5˚C
Max. temperature tolerance: up to 190˚C for short exposures

Isocheck Quietroof system, supplied by Isomass Ltd. Unit 14 Papworth Business Park, Stirling Way, Papworth Everard, Cambridgeshire CB23 3GY and installed in accordance with manufacturer’s instructions / recommendations.

Full installation instructions for Isocheck Quietroof is available as a pdf to download. Go to the Downloads tab on this page.

Isocheck Quietroof installation instructions


Isocheck Quietroof product data sheet


Problems of noise from rain on metal roof cladding

The noise of raindrops falling on a metal roof, especially during heavy rain, is incomparably bigger than rain falling on concrete or clay tiles. This noise spreads throughout the unflanked roof construction and into adjacent buildings - disturbing the occupants inside the rooms. Particularly problematic are noisy activities in closed metal constructions, where sound intensity amplifies significantly - caused by poor sound absorption capability of metal sheets, which also creates echo.

Regulations for various facilities, including schools and hospitals, require that suitable control of rain noise reverberant sound pressure levels have been addressed within the design of the building. For hospitals, ‘Health Technical Memorandum 08-01: Acoustics’, requires: “indoor ambient-noise levels during ‘heavy’ rainfall, as described in BS EN ISO 140-18, should not exceed the intrusive noise criteria by more than 20dB, or should not be more than 65dB, whichever is lower.”

In schools, ‘Acoustic design of schools: performance standards Building Bulletin 93 2015’ requires that: “Building Regulation submissions should demonstrate that lightweight roofs and roof glazing have been designed to provide suitable control of rain noise reverberant sound pressure level in a space (calculated using laboratory test data with ‘heavy’ rain noise excitation as defined in BS EN ISO 140-18). Levels during heavy rain should not be more than 25dB above the appropriate indoor ambient noise level given in table 1”, which for classrooms and general areas of Nursery, Primary and Secondary Schools is 35dB.

Traditional soft insulation such as mineral wool may dampen vibrations in the panel but could provide thermal bridging to other components. Rigid insulation will provide excellent thermal performance but its acoustic value is low and it may also have the same bridging effect. What is required is a solution which eliminates bridging and improves acoustic insulation.

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