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MMC Modern Methods of Construction (CPD) G#309 N#310

GBE CPD MMC Modern Methods Of Construction A03 BRM 180520 S1 PNG

MMC Modern Methods of Construction CPD

GBE > Encyclopaedia > Files > CPD > G#309 N#310

MMC Modern Methods of Construction CPD
About:


  • MMC Modern Methods of Construction
  • © 2007 – 2020
  • This Presentation on GBE:
  • Find this file on GBE website at:
  • https://GreenBuildingEcyclopaedia.uk/?P=309 (this page)
  • Go there for:
    • –the latest update
    • –versions presented to different audiences
    • –the whole presentation all of the hidden slides
    • –other file formats:
      • Handout, Show, PDF, PPTX
    • –Links to other related GBE CPD and related GBE content

Definition

  • ‘a broad range of processes that aim to produce more, better quality homes in less time.
  • The definition is categorised in terms of products:
  • Panellised, volumetric, hybrid and other methods,
  • and may involve off site manufacturing.’
  • NAO (National Audit Office)

GBE Brain Dump

  • MMC

Unintended Consequences MMC

  • Building more housing rapidly to solve housing crisis using the wrong materials will add to:
  • ‘Carbon Burp’ if carbon intensive materials (Plastics) are used or
  • ‘Energy Burp’ is using energy intensive materials (Metals and mineral fibres) are used
  • let alone other issues (described below)

Considerations

  • Many timber-based methods as well as metal or concrete
  • Insulating, thermal bridge free, airtight construction, Low Embodied Carbon, Low energy demand in use, no overheating, Bio-based v petro-chemical construction
  • Better buildings than business as usual, lowering prices of home ownership or more business as usual profiteering at the expense of customers?
  • ‘Need for speed’ by Government, at the expense of getting it wrong, again.
  • Quality of MMC for manufacturers or quality of building for users?

Offsite process and smart Tech influence on Construction

  • Improvements in competency
  • Tolerance (On-site inaccuracy accommodation)
  • Modular design (As bought material sizes) and waste minimisation
  • Design for construction/assembly and deconstruction/reconstruction for second life applications
  • BIM with CAD CAM capability
  • BIM with clash detection,
  • BIM with materials intelligence
  • BIM with energy and comfort modelling apps
  • Logistics Software and logistics of supply to sites

MMC Format:

  • Framed, Infill, Pod, Panel, Modular, stacking assembly and joining techniques.
  • Modular acknowledging the size of materials to reduce off-cut waste
  • Modular to enable reuse at end of first life.

Building Performance:

  • Strength, Fire, Acoustic, Thermal, Thermal bridging, wind and air tightness, Moisture integrity
  • MMC cannot be looked at in isolation from performance and how the building will be serviced (temperature, humidity, etc. control)
  • And if it is to be Vapour open or Vapour closed construction and materials choices subsequently

Forms of off-site construction and delivery

  • Production benefits associated with off site construction including modular construction, factory construction, automation and robotics, and 3D printing

Pods and Modules; How installed

  • Consider how pods and modules are inserted into framed construction, into or onto floor thickness,
  • interface with preceding and following trades,
  • maintaining all performance integrity, connecting to services and finishing off the connections and accesses.

Modules: How assembled

  • Consider how modules are assembled and maintaining thermal bridge free construction
  • Consider how modules attach thermally-broken from and to:
    • any other structure: frames;
    • and to secondary elements: Stairs, landings, balconies

Framing and thermal bridges

  • Needs to consider framing/non-framing methods of panel production,
  • alternative framing materials and potential for thermal bridging,
  • impact of strengthening at edges and openings on the increases in thermal bridges.

Acoustics

  • Consider acoustic performance of external fabric with various thermal insulation choices

Insulation choices

  • Need to consider insulation choices for:
    • winter heating (normal) and
    • summer cooling (essential with MMC) and risks of overheating or
    • risk of high energy/carbon over life of building with retrofitting ‘comfort cooling’ air conditioning.

Overheating

  • Consider top floors and single aspect
  • to be able to stay cool in summer overheating potential
  • Security,
  • smells,
  • noise and night time noise in use,
  • windows and vents

Panel/Joint and Psi values

  • Needs to consider insulation material choices and potential thicknesses
  • and (thermal bridge psi values increase in thicknesses.

Insulation thickness: on Module Size

  • Thickness of panels size
  • impact on Modular and Panels on the transport implications.

Joints: Air and Wind Tightness

  • Consider panel and semi-modular assembly and wind and air tightness
    • regimes and
    • details of any Penetrations
    • Including Services

Integrating Services

  • Integrating services
  • rewiring during life,
  • wiring across junctions and joints,
  • adding new services during use

Comparison

  • All or most of the site issues move to the factory
  • or duplicate the issues on site and in the factory
    • –Waste,
    • –H&S,
    • –Wet trades,
    • –Tolerances,
    • –Factory Dry, weather-free conditions
    • –Skills shortages,
    • –Training to Approved status,
    • –No time to care

Management need to manage

  • Management, Supervision,
  • Modern and Innovative methods need Trade Toolbox talks

Impact of off-site construction on

  • assembly,
  • time on-site,
  • quality,
  • waste minimisation,
  • Safety

Social, economic, environmental and cultural factors:

  • Consider:
    • –Bio-based methods of construction: solid wood, CLTP, LTF, SIPS, ISPS.
    • –Bio-based insulation, consider Embodied Carbon. Operational Carbon, Whole Life Carbon, Whole Life Costs, Whole Life carbon Costs.
    • –Plastic free construction.
    • –Products accessories and systems on the market.

Different production models

  • Trade schools and skilling for the tasks.
  • Wet or dry trades,
  • pre-drying,
  • curing,
  • performance optimisation

Logistics

  • Traffic, overnight haulage, preplanning route, consolidation yard, final delivery, cranes, handling,

On-site installation

  • Stacking, interlocking, guiding technology or inserting into existing, sliding, inserting from cranes,
  • Safety issues
  • Tolerances, assembly creep, replacing intermediate units/panels, design for assembly, designing for deconstruction, Servicing, integrity proofing,
  • Energy performance
  • Building Regulations and SAP or SBEM
    • –are not good enough for Climate Emergency

%%% More work to do


Consider:

  • –Passivhaus & EnerPHit
  • –AECB CarbonLite,
  • –LETI,
  • Users Expectations
  • Better informed public are expecting better
  • If MMC want to show the Construction Industry how to do things in a competent manner, then they need to address everything.
  • Retrofitting MMC
  • Retrofitting inadequate MMC will be impractical and makes no financial sense.
  • I would want to sue the MMC sector for ignoring the obvious and sue them for ignoring climate change and for creating overheating buildings.
  • Comfortable with no overheating
  • Passivhaus energy standards are based in comfort conditions
  • Economy/market
  • Viability of main electricity and carbon intensity to serve the MMC services and maintain a low carbon solution
  • Procurement
  • MMC manufacturer as contractor and site works as sub-contractor
  • User/stakeholder requirements.
  • PII risk free
  • Competent, condensation free, mould free, overheating free, no fire risk, no unsellable homes,
  • Detailed Analysis
  • MMC
  • Offsite Configurations:
  • Volumetric,
    • –Modular
  • Domestic: parts of flats or houses
  • Motels: Bedroom bath corridor bath bedroom
    • –Podular
  • Bathrooms
  • Kitchens
  • Plant rooms
  • Freezers
  • Panellised: Walls, floors, roofs, partitions
  • Turn key solutions

–Fast food chains: Complete fit out at factory

  • Opportunities:
  • Off-site factory production
  • On-site in factory conditions
  • Waste minimisation in factory, minimal site waste
  • No surpluses delivered to site, used in factory
  • Packaging waste onsite minimisation
  • Efficient site work

–Unhindered ground works

–Servicing connection and completion

  • Lean Construction
  • Aim to minimise waste in all its forms

–Management time

–Labour time

  • Factory production can exploit this well

–Production line efficiencies

–Trade or task Specialisation

–JIT deliveries

  • Lean Gone Wrong
  • But lean is being misinterpreted and going wrong, seriously wrong

–Masonry

–Wiring

  • Design Issues:
    Factory Production
  • Created to standard/design sizes

–Ignore site reality

–Base inaccurate setting out?

  • Site/Factory tolerances

–sometimes things go wrong

  • Site operative idea of tolerances don’t match factory
  • Wasted on site if wrong size
  • Design Issues:
    Site production
  • Create site factory under canvas
  • When offered up, if wrong size, rework and reinstall
  • Potentially less waste
  • Design Issues: Insulation
  • Rarely have any thermal mass or decrement delay
  • Use thin high embodied carbon and embodied energy insulating materials
  • Gappy insulation > Performance Gap
  • Gaps between units? Heat loss
  • Design Issues: Installation
  • Big strong operatives may damage fragile parts
  • Site operative idea of tolerances don’t match factory
  • Wasted on site if wrong size
  • ‘Helping hand’ supports permit adjustment

–Potentially one man operation

  • Procurement:
  • High % of Costs: are in the Modules
  • Low % of Costs: Site works
  • Profits for attendance and preliminaries by Main Contractor if % become large
  • Site Works Contractor/Operatives may become a subcontractor of the Modular manufacturer

–More control over site setting out and tolerances

  • Site Preparation:
  • Similar to Normal sites
  • All services in and wastes out
  • Landscape: Hard, soft and wet
  • May include reclaim and reuse of water
  • May include permeable pavement
  • Bases for MMC need to be accurate
  • Logistics Issues
  • Volumetric:

–Transporting lots of fresh air

–Avoided by panellised

  • Just in time delivery

–Needs buffer park-up place near site

  • Road closures

–Expensive crane hire

  • MMC Elemental Assemblies
  • Materials and methods
  • Light Timber Frame (LTF)
  • Light Metal Framed (LMF)
  • Prefabricated panel construction
  • Metal Stud External Walls
  • Greenwich Millennium Village Phase 2a
  • Egan initiative implemented:
    prefabrication off-site, simple
    assembly on site,
    reduction
    of site waste
  • later on-site
    factory-production
  • Metal frame walls
  • Balloon frame Platform Frame
  • Concrete Frame

Infill panels

Curtain wall

  • Factory Prefabrication:
  • Conditions ensure no deterioration
  • No mud or cement splashes
  • No rain to spoil
  • Use of all the materials supplied
  • Reusing until all is gone
  • Virtually no waste
  • Compound Studs ‘I Studs’ to accommodate more thermal insulation
  • MMC Modern Methods of Construction
  • Opaque Timber Walls Timber Constructions
  • Compound Studs ‘I Studs’, inner and outer boards and thermal insulation
  • Compound studs ‘I studs’, inner and outer boards and thermal insulation
  • Insulated structural Panels

Roof panels create

Habitable Roof Space

Platform Frame

  • SIP Structural Insulated Panel
  • SIP Structural Insulated Panel
  • Structural Insulated Panels

Roof panels create

Habitable Roof Space

Platform Frame

  • Load-bearing Cross Laminated Timber Panel walls (CLTP)
  • Opaque Timber Walls Timber Constructions
  • Load-bearing Structural Cross Laminated Timber Panel
  • Cross Laminated Timber Panel
    shear walls floors and roofs
  • Cross Laminated timber Panels

Roof panels create

Habitable Roof Space

Platform Frame

  • Load-bearing Timber blockwork
  • Opaque Timber Walls Timber Constructions

© GBE 2007 – 2020


© GBE GBC GBL NGS ASWS Brian Murphy aka BrianSpecMan **
29th April 2014 – 20th April 2021

MMC Modern Methods of Construction CPD
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GBE CPD MMC Modern Methods Of Construction A03 BRM 180520 9H1 PNG

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© GBE GBC GBL NGS ASWS Brian Murphy aka BrianSpecMan **
29th April 2014 – 20th April 2021

MMC Modern Methods of Construction CPD
See Also:


GBE Jargon Buster

  • IMC
  • MMC
  • Factory Assembly
  • Innovative Methods of Construction (IMC)
  • Modern Methods of Construction (MMC)
  • Off-site
  • Prefabricated
  • Pre-assembled

GBE CPD

CPD Topics N#478

GBE CPD About Specification G#560 N#580


GBE Brain Dump


© GBE GBC GBL NGS ASWS Brian Murphy aka BrianSpecMan **
29th April 2014 – 20th April 2021

MMC Modern Methods of Construction (CPD) G#309 N#310

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