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Problem Addressed

Construction waste.

According to DEFRA鈥檚 February 2018 edition of UK Statistics on Waste, in 2014 the UK generated 202.8 million tonnes of waste, and construction, demolition and excavation was responsible for 59% of that number ().

The environmental and commercial arguments for mitigating such profligacy are clear, and one significant solution lies in a relatively simple concept 鈥撎materials resource efficiency.

WRAP UK, in their document 鈥楧esigning out Waste: A design team guide for building鈥, state the following:听鈥淯sing materials more efficiently is a highly effective sustainability strategy and involves a balanced approach, ensuring that at each stage of construction materials are used in an efficient manner.鈥澨

WRAP UK identify, in this document, the crucial contribution designers can make in reducing waste through their design and present five key principles to guide them, accordingly:

  1. Design for Reuse and Recovery
  2. Design for Off-Site Construction
  3. Design for Materials Optimisation
  4. Design for Waste Efficient Procurement
  5. Design for Deconstruction and Flexibility

Solution Overview

The five principles above were instrumental in the development of Akustak, a 鈥榸ero avoidable waste鈥, Building Regulations 鈥 Part B and E compliant, acoustic modular wall system.

  1. Design for Reuse and Recovery: Akustak, through its demountable form, enables reuse and recovery more readily than traditional interior wall building methodologies.
  2. Design for Off-Site Construction: Akustak modules are fully manufactured off site, therefore, off-cuts, that would otherwise go to waste, are stored for future fabrications. Off-site manufacturing also enables:
    • Quick & Easy On-Site Access: Due to its size and weight, Akustakcan be easily handled by one man (as per HSE guidelines) and its stackable design minimises transport and storage requirements.
    • Rapid Installation: Prefabricated and portable, Akustaktransforms interior wall construction into a rapid process of assembly, from 15 m2/ per hour.
    • Meticulous Workmanship: precision engineered in a factory environment, Akustakaccurately interconnects to form pre-specified wall sizes, minimising on-site errors and re-work.
    • Minimised Noise, Dust & Disruption On-site: Akustakminimises trades and site activities; requiring just 1 to 2 fitters, a cordless drill and basic hand tools. This too enhances health and safety standards on-site, including Covid-19 infection prevention and control.
  3. Design for Material Optimisation: Akustak听modules come in standard dimensions and are formed entirely of parts 鈥榙imensionally coordinated鈥 with universal sheet/slab sizes, thereby avoiding/minimising excess cutting and off-cuts. Generally, where off-cuts do arise, they are reusable.
  4. Design for Waste Efficient Procurement: Akustak听is a product developed by Mute Group, which designs and builds solutions in noise control, vibration control and acoustics, across all sectors, with a client base including Alexander McQueen, Disney, HS2, Oxford University and Westminster Cathedral. As such, there is ample opportunity to specify Akustak, where less resource efficient systems would otherwise be employed.
  5. Design for Deconstruction and Flexibility: Akustak, through its demountable form, facilitates recovery and reuse, at the point of deconstruction.

Laboratory tested for fire safety (BS EN ISO 1364-1) and resistance to sound (BS EN ISO 10140-2 & 717-1), Akustak听guarantees Building Regulations 鈥 Part B and E compliance. Aku125, for example, provides 79 minutes fire resistance and Rw 49 dB airborne sound insulation.

A real-life, single-space case study is used to exemplify 鈥榝inancial鈥 costs/benefits (to the client, only):

A physiotherapist rents a therapy room inside an office complex. The room, across one wall (of 12.5 m2), directly adjoins another company鈥檚 office and, as such, lacks the requisite levels for confidentiality. The separating wall needs to be acoustically upgraded, by installing an acoustic independent wall system. The options are:

OPTION 1: Traditional stud-wall construction, suitably acoustically insulated.
OPTION 2: Akustak acoustic modular wall system.

Note: when the occupant鈥檚 tenancy ends, the room must be restored to its鈥 original state.

Cost Items OPTION 1 Costs: OPTION 2 Costs:
Supply & Fit Cost: 拢1950.00 拢2350.00
Lost Revenue During Installation,听i.e.听when therapy room is out of use: 拢1800.00,听i.e.听therapy room unavailable for 3 to 4 days, with all听construction听works undertaken on-site. 拢600.00,听i.e.听therapy room unavailable for 1.5听days, with majority of construction works undertaken off-site.
Cost to Remove System & Restore Room as Found,听i.e.听after tenancy: 拢550.00 拢550.00
Cost to Dispose of System,听i.e.听after tenancy: 拢150.00 N/A
Cost to Replace System (at new premises),听i.e.听assuming a like-for-like system is required: 拢1950.00,听i.e.听system needs to be rebuilt, from scratch. 拢700.00,听i.e.听system can be reassembled.
Total Cost: 拢6400.00 拢4200.00
Total Cost/Benefit: – 拢2200.00 + 拢2200.00

Case Study

贰狈骋滨贰鈥檚听ExCEl听District Energy Centre听provides heat and power to the听ExCel听Exhibition Centre听and surrounding听补谤别补听(London鈥檚 Royal Docks),听using听Combined Heat & Power听engines (CHPs).Airborne sound,听emanating from these engines, was the cause of continuous noise nuisance complaints from the adjoining dwelling-apartments.听Akustak was specified to mitigate the problem, from the Energy Centre side.

Its modular construction and manoeuvrability听(particularly at height and within confined spaces) made听Akustaka good fit听for this logistically challenging project.The modules were modified to suit the rigours of an industrial environment, including听a听fire-treated, impact resistant fascia; ensuring the installation is fit-for-purpose, for years to come.

Pre-completion sound insulation testing听demonstrated that,听following theAkustak听installation,听sound levels听in the adjoining dwelling-apartments, due to the transmission of Energy Centre sound,听met World Health Organisation (WHO) limits,听i.e.in bedroomsat night (23:00 to 07:00),听the guidance limit is听30 dB听LAeq,8h听and for听living rooms and bedrooms听during the day, the guidance limit听is 35 dBLAeq,16h.

This page presents data, evidence, and solutions that are provided by our partners and members and should therefore not be attributed to UKGBC. While we showcase these solutions for inspiration, to build consensus, and create momentum for climate action, UKGBC does not offer commercial endorsement of individual solutions. If you would like to quote something from this page, or more information, please contact our Communications team at media@ukgbc.org.

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