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
Images:
GBE CPD
GBE CPD MMC Modern Methods Of Construction A03 BRM 180520 9H9 PDF
- GBE CPD MMC Modern Methods Of Construction A03 BRM 180520 S74 PDF
- GBE CPD MMC Modern Methods Of Construction A03 BRM 180520 PPTX
© 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 MMC (Brain Dump) G#39443
© GBE GBC GBL NGS ASWS Brian Murphy aka BrianSpecMan **
29th April 2014 – 20th April 2021