acoustic pipe and duct lagging

Soundlag® is a high-performance composite acoustic lagging product developed to reduce noise from pipes, valves, fan housings, and ductwork in commercial, industrial and domestic buildings.

Soundlag® 4525C provides an optimal soundproofing solution for those seeking compliance to BCA (Building Code of Australia) F5.6 requirements for habitable and non-habitable rooms. Based on test results, Soundlag 4525C can offer a significantly higher performance of up to 5 dB(A) compared to low noise pipe products especially in areas with no ceiling or with penetrations.

The highly dense and flexible mass layer provides excellent sound reduction properties, whilst the decoupling layer breaks the vibration path between substrate and the mass barrier, allowing the vinyl external wrap to remain flexible – optimising performance. The external foil facing offers a fire resistant covering and an excellent surface to join adjacent sheets.

Pyrotek® offers varying compositions with barrier weights from 3 kg/m² to 8 kg/m² and the decoupling layer with a choice of plain (4512) or convoluted (4525C) foam, polyester, fibreglass, glass wool or quilted glass wool with thicknesses from 6 mm to 50 mm.

Alternative colour options to the reinforced aluminium facing are black and white foil. These anti-glare foil colours are suitable for exposed ceiling spaces.


Soundlag® 4525C (blue) and 4512 (Grey) foam backing

Soundlag® 4525C (blue) and 4512 (Grey) foam backing

Technical data

Endorsed and tested by leading acoustic consultants and engineers.

The trend towards high-density living environments and lightweight building construction over the last decade has required an improvement in the control of noise from waste pipes and general plumbing.

Please refer to the Technical Data Sheet (TDS) for more information.

Document downloads

Document title Document type Document language
Soundlag Technical Data Sheet English
Soundlag (ZH) Technical Data Sheet 中文 (Chinese)
Soundlag 8025C Technical Data Sheet English
Soundlag Installation Installation Guide English
Soundlag Installation (ZH) Installation Guide 中文 (Chinese)
Soundlag Brochure Brochure English
Soundlag Brochure (ZH) Brochure 中文 (Chinese)
Pyrotek Building Catalogue Catalogues English
Pyrotek Building Catalogue (ZH) Catalogues 中文 (Chinese)
Commonwealth Games Village Case Study English


  • Hydraulic and waste water pipes
  • Air-conditioning ducting and shrouds
  • Compressor wraps
  • Spa motor wraps

bedroom flipped soundlag


  • Better performance - up to 5 dB(A) with Soundlag® 4525C compared to low noise pipe products without ceiling or areas with penetrations
  • Free from odour producing oils and bitumen
  • Contain no ozone depleting substances
  • Accredited to ISO 9001 Quality Control Standard
  • Tested to AS 1530.3 with excellent flame resistance
  • Broad operating temperature range
  • Reduces noise in hydraulic and waste pipes by up to
    25.2 dB(A) (4525C)
  • Varying range of weights and thicknesses
  • Choice of foam, polyester, fibreglass or glass wool
  • Can cut to size and simple to install
  • Easy to bond - matching Tape ALR or equivalent
  • Endorsed by leading acoustic consultants and engineers


Soundlag® is easy and simple to install without specialist tools or trades.


  1. Tape ALR is easy to tear by hand.
  2. Remove the release liner backing
  3. Position tape centrally over the sections to be joined and firmly press along the entire tape surface.
  4. Wipe or rub with firm pressure across the tape with a cloth or blade to smooth out any air bubbles or buckles.
    Do not over-stretch the tape when applying, as this will create buckles and voids in the contact area.

All joints along longitudinal pipe sections must be fitted with an overlap of adjoining segments. Overlapped sections must then be taped and sealed with ‘Tape ALR’ or equal. A strip of 30 mm foam can be removed along one or both edges as required to provide for an overlap at joints.


Soundlag® installation

Soundlag® installation