brian murphy, greenspec
TRANSCRIPT
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Design to help
Reduce Waste Easy steps to reduce your share
of the 109 m tonnes of construction and demolition
and excavation waste each year
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This Seminar
• Downloadable from
www.greenspecdownload.co.uk
18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 2
Design generates waste
• Waste reduction is not a site issue
– It is a Design Issue
• It becomes a site issue
– if is was not seen as a Design issue
• Join in now or
– D&B takes another % of UK procurement
18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 3
SITEwise II Waste Campaign
• Environment Agency (Anglian)
• Breakfast meetings
• 200+ Pre-construction Professionals
• Waste is not a key issue
• Scored 8th out of 12 issues
18/03/2013 10:26 4 © NGS 2002-2013 Waste At Design Diagrams
Some easy wins
• Design to standard sizes
• Design to reduce off-cut waste
• Design for on and off site reuse
• Design for on and off site recycling
• Design for maintainability, adaptability &
flexibility
• Design for deconstruction and reuse
• Design spares storage for maintenance
• Design for in use waste management 5
Serendipity?
• Design for Easy of Assembly
• Lends itself to
• Design for Deconstruction
• But Architects are not very interested in
construction nor deconstruction
• The RIBA curriculum does not address it
very well
• RIBA external course assessors frown at
too much technology 6
Waste Facts & Figures
Another GreenSpec CPD file to download
See www.greenspecdownload.co.uk 7
Relearn some waste statistics
• 400m tonnes/year materials to UK CI
• 100mtonnes/year wasted by UK CI
• 30m tonnes is materials off-cuts
• 24m tonnes/year (24%) is packaging
• 23.7m tonnes/year soil & rock
• 10m is temporary materials
• 10m tonnes/year over ordered never
needed £1.5bn/annum (EA 2007)
8 18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams
Over ordered never needed
Lost, stolen and reordered (not to scale)
• Required for the design
• QS inaccurate take off +/-10% Requires remeasure by contractor
• SMM7 Wastage factor 5-20% 33% is off-cuts some is damage
• Over-order safety margins x%
• Minimum order quantities +++
• Call-off extra % JIC Just in case
• Merchant delivers % more than required
– in the hope nobody is checking,
– invoices accordingly
• Lost on site
• ……Stolen from site for PJs 20%
• Reorderd to replace lost or stolen
• ……Damage & Poor quality work 3%
• ……Spares for on going maintenance
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Relearn some waste statistics
• Packaging waste can vary between 5% and
50% (24% average) of waste stream
depending on construction method
18/03/2013 10:26 10 © NGS 2002-2013 Waste At Design Diagrams
Common Waste Causes 1
• Offcuts: 33.2%
• Recyclable packaging:
18.7%
• Excess deliveries 18%
• Temporary materials:
10.3%
• Reusable packaging:
14.4%
• Site Office and
Canteen: 4.1%
• Damaged through
methods of work:
3.2%
• Unsuitable storage:
1%
18/03/2013 10:26 11 © NGS 2002-2013 Waste At Design Diagrams
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BREEAM v Ska
• Different Priorities
• BREEAM: Business as Usual
– K40 reuse
• Ska: make a difference
– K40, K41, M10, M40, M50, M51 reuse
18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 12
Waste Hierarchy
Another GreenSpec CPD file to download
See www.greenspecdownload.co.uk 13
Reduce:
Modular design wastes less
Allows reuse readily • Walter ‘Segal Method’ • Whole component used
full size no cutting
CAT Centre for Alternative Technology
Robin Hillier Diggers
Self-build Brighton
18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 14
Reused wood better than new BedZED Beddington Sutton Architect: Dr Bill Dunster,
Reclaim: BioRegional ReCLAIMED ©
NGS
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Recycle: Glass sand for bedding
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Reduce
Reuse & Recycle
Recover
Reject
Waste Hierarchy
The reality
Effort
Less
More 18/03/2013 10:26 17 © NGS 2002-2013 Waste At Design Diagrams
Waste Hierarchy
new definition Rethink, Re-educate, Resolve, Refocus,
Resource, Relate, Research, Refer, Refresh,
Rename, Regard, Revalue, Remeasure,
Reprogramme, Replan, Reconsider, Refuse,
Reject, Return, Redesign, Regularise,
Rehearse, Rationalise, Remediate, Reduce,
Reserve, ReSpec, Register, Reuse,
Reclaim, Repair, Retain, Remind, Recycle,
Recover, Record, Report, Reward, Review,
Revise, Refine, Restart 18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 18
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18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 19
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This house
only uses
reject floor
boards from
too high a
spec
18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 20
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Geometry Dictates
Everything
Geometry in Design
• Geometry for its own sake
• I can CAD, Because CAD can, I do
• Lazy design
• Creates waste
18/03/2013 10:26 22 © NGS 2002-2013 Waste At Design Diagrams
Fashionable (Architecture?) 1990s
Overlapping grids create cuts & waste
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Site Boundaries & Geometry
create cuts & waste
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Circular & radial Geometry
demands bespoke
or creates cuts & waste
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Efficiency:
Return Defects &
Protection
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Reject &
Return
Defective
Materials
18/03/2013 10:26 27 © NGS 2002-2013 Waste At Design Diagrams
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Return
Protective
& Packaging
Materials
18/03/2013 10:26 28 © NGS 2002-2013 Waste At Design Diagrams
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Reduce Demand
on materials
18/03/2013 10:26 29 © NGS 2002-2013 Waste At Design Diagrams
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Resource
Efficiency:
Timber
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Reduce Demand
• Don’t over design structure
• Except if long design life demands it
• Don’t oversize
• Don’t cut section from solid if compound is
possible
18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 31
Reduce Demand
• Don’t cut section from solid if compound is
possible
• Reduce solid sections to compound to reduce
weight and materials used
18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 32
Reduce Demand
• Consider use of materials as found:
• Round pole structures
• Or compound sections without waste
• Or use off-cuts in cladding
Roundwood Cut Waste Wood Boarding Cut
Reassemble
33
?
?
Standard size leads to over-design
Multiple section simplifies design
Different section complicates detail
Creates off-cuts and waste
Changes appearance below
Joists/Beams & Partitions
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Multiple section simplifies design
Joists
18/03/2013 10:26 35 © NGS 2002-2013 Waste At Design Diagrams
Different section complicates detail
Creates off-cuts and waste
Changes appearance below
Joists/Beams & Partitions
?
36
?
Standardising size leads to over-design of
many for the one
Joists/Beams & Partitions
18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 37
Multiple section simplifies design
Joists/Beams & Partitions
18/03/2013 10:26 38 © NGS 2002-2013 Waste At Design Diagrams
Multiple section with flitch plate of steel
bolted together
Floor
Joists/Beams & Partitions
18/03/2013 10:26 39 © NGS 2002-2013 Waste At Design Diagrams
Off-cuts of insulation:
waste
Avoid over design of structure around openings
Avoid lack of design: adding additional studs for luck
Avoid creating wide cold bridges through insulation
Avoid Waste: chopping thermal insulation rolls
Strength v U Value
in external wall
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Designing the
Sequence of
Assembly Dry-linings board heights & widths
Design dictates Sequence &
numbers of visits • The details at the abutments dictate the
sequence of assembly • Whether the designer likes it, admits it or not • Construction & Structure: foundations to roor • Consider wet trades: first, dry: second • Consider working top down to minimise
damage of floors by following trades • Consider working from the room extremity
back towards the door
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Structural Floor
Structural Floor
Screed
Suspended ceiling
Raised Access Floor
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2
3
4 4
5
6
7
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Design details create waste
• Many heights of partitions and linings
• Creates demand for different height boards
• 1 maker provide an off-cut take-back
scheme (BG but not comprehensive)
• Others provide purpose made boards cut to
height (if the job is big enough)
• Others cut board to size (F)
• How many sizes does your job need?
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Structural Floor
Structural Floor
Screed
Suspended ceiling
Raised Access Floor
3.2 3.0 2.6 2.4 2.5
Check board sizes as you design
Don’t assume all board grades are the same
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Reuse of off-cuts
18/03/2013 10:26 50 © NGS 2002-2013 Waste At Design Diagrams
Reuse spare
materials
on-site & in use
Recycle
Materials
on-site
18/03/2013 10:26 51 © NGS 2002-2013 Waste At Design Diagrams
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Segregate waste
local to
point of generation
to enable reuse
on-site or offsite
And even on-site again
18/03/2013 10:26 52 © NGS 2002-2013 Waste At Design Diagrams
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Redesign to
reduce waste
18/03/2013 10:26 53 © NGS 2002-2013 Waste At Design Diagrams
Avoid Late Design Changes
• Late design changes
• Late instruction
• Late changes
• Incorrect materials being delivered
• Leads to error
• Leads to waste
18/03/2013 10:26 54 © NGS 2002-2013 Waste At Design Diagrams
Wrong Information
• Late instructions
• Revised design?
• NEDO report 1987
• Quality On Building Sites
• QRE Quality Related Events
• Errors in information or in its delivery
• 50%:50% split Design:Construction
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Random Sizing:
generates waste
• Random
dims
• Centred
setting out
• Tile spacing
• Cut edges
• Waste
18/03/2013 10:26 56 © NGS 2002-2013 Waste At Design Diagrams
Grid areas and plain boundary
• Random
dim rooms
• Centred
setting out
• Tile spacing
• No cut edges
• Reduced waste
18/03/2013 10:26 57 © NGS 2002-2013 Waste At Design Diagrams
Grid areas & small element margin
• Random
dim rooms
• Centred
setting out
• Tile spacing
• Smaller tiles
• at perimeter
• Reduced waste
18/03/2013 10:26 58 © NGS 2002-2013 Waste At Design Diagrams
C
Suspended ceiling
Grid, tiles &
Services
Carpet tile
Raised Access Platform Floors
Tiled floor
Stone floor
Partition
system
Off-cuts
and
specials
Room
size
Off-cut
Waste
L
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18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 60
Bad design ignores edges
18/03/2013 10:26 61
Respond to structure potentially
wasteful unless designed
18/03/2013 10:26 62
Respond to structure, perimeter
scale change, but still cutting
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18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 63
Mosaic infinite adjustment
if boarders permit
18/03/2013 10:26 64
Change scale at perimeters
Craftsmen can work it out
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18/03/2013 10:26 65
Borders but no change of scale
Design Avoids Waste
• Setting out: Not straight forward
• Few cut bricks: little waste
• Labour simplified
• Looks expensive: cheap to lay
• Assumptions made about relative costs
• Quality Surveyor: think resource efficiency
& simple construction
18/03/2013 10:26 66 © NGS 2002-2013 Waste At Design Diagrams
Coordination Reduces Waste
Room Size : Component
• Dimensional
co-ordination
• Room sizes
match Tile
modules
• No waste
18/03/2013 10:26 67 © NGS 2002-2013 Waste At Design Diagrams
But look outside the box:
More cut tiles 68 18/03/2013 10:26
Modular thick walls solve it
But occupy space: Minimise nett:gross ratio 69 18/03/2013 10:26
Add storage: built into walls
Claim some back 70 18/03/2013 10:26
71 18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams
• Recessed cover of chambers do not have
to follow orientation of chamber
• Position of cover to co-ordinate with tiles
• Less cutting
less waste
• Inside and
outside
Coordination of Services
Covers & Chambers?
72
Design to minimise waste
• We are familiar with sizing walls to bricks
and half brick lengths externally
• And now also blocks internally
• What about:
• 8 x 4 Panels in modules
• Lengths of structural members
18/03/2013 10:26 73 © NGS 2002-2013 Waste At Design Diagrams
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18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 74
Off-cuts 33%
• Boards 8 x 4 Panels in modules
• Timber sections: Off-cuts for noggins
• Design structural members at size they are
manufactured
• Make toilet cubicles core board and plastic
laminate sheet sizes
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18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 75
Schools
• Money available based on set room sizes
• Does not allow for size variation to minimise
waste from off cuts
• Tries to control costs
• but ends up costing more
• due to high wastage factor
Tartan Grids
• Dimensional
co-ordination
• Panels and
Spacer
• Column and
walls
• More cutting little waste
18/03/2013 10:26 76 © NGS 2002-2013 Waste At Design Diagrams
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Size is
Everything
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6 m x 1
3m x 2
500 mm x 12
Co-ordinated?
• Structural Grid
• Partition layout grid
• Plat form floors/suspended ceiling grid
• Carpet tile size 78
600mm x 10
Design Tools & Calculators
• Flooring REAP FSP ambition, – grant application with WRAP
• Size of space
• Size of flooring components
• Design setting out rules
• Minimum order quantities
• Waste %, tonnes, £, EE, EC
• Alternative materials: better %?
• Different setting out rules?
• GreenSpecCALCULATORS 79
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Optimum fit
• Room Size: 2184 x 3567 mm.
• Flooring product size eg 600 x 600 mm.
• Layout rules: centered/one end/angle
• Perimeter condition: skirting detail
• Offcuts: m2, kg, %, £Waste, EE, EC
• Optimise: find best fit product size
• Reduce waste
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Calculators
• Develop Waste Cost ® lite calculator
• Calculator 1
– Set room size
– Trial floor product sizes
– Trial floor product
• Calculator 2
– Set floor product sizes
– Trial room sizes 81
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Demonstration
file://localhost/Users/BrianSpecMan/Documents/AS
WSDOCS/GREEN/NGSpec/GreenSpecServices/Gre
enSpecWasteCostLite/WasteCostLite(R)B.xls
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C L
© NGS 2002-2013 Waste At Design Diagrams
18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 85
Skirting/covedskirting Yes
Decoration/Finish/Sealer/Stain/Oil NoVisualfloorsurfacematerials Yes
Jointing/Grounting YesMovementControlJoints Yes
Adhesive/Bonding YesBedding Yes
Battens Noinsulation No
Isolation Nounderlayment NoScreed NoSliplayers No
length width/height Thickness length width/height Thickness length width/height Thicknessmm mm mm mm mm mm mm mm mm
Roomsizesurfacetosurface 1000 1000 1000 1000 1000 1000
Plaster/Dryliningandbattenzonethickness 25
Flooringproductsize(nominal) 600 600 10 500 500 8 300 300 5
Jointingwidth 10
numberofcolours 1
Percentagesofcolours 100 0 0 0 0 0 0 100 %
Roomshape Square Square SquareSettingout CentredonJoint(evennumbers) CentredonJoint(evennumbers) CentredonJoint(evennumbers)
layingpattern stackbondsquaregrid stackbondsquaregrid stackbondsquaregrid
Orientation
Longproductedge0degreesto
longroomside
Longproductedge0degreesto
longroomside
Longproductedge0degreesto
longroomsidecolours 1colour 1colour 1colour
Otherinefficiences none none noneFlooringwastecalculationflooringsize(lessperimeter) 900 900 900 900 900 900howmanyproductfitroom 1.5 1.5 1.8 1.8 3 3
wholenumbersfitroom 2 2 2 2 3 3Nouseofoffcutsfromonesideatother 1 1 0 0 0 0
Revisednumbersfitroom 3 3 2 2 3 3Flooringproductquantity 4 4 9
Flooringproductquantity(revisedforoffcut) 9 4 9
Packquantity 30 40 100
Noofpacks 1 1 1
Wastefrompackquantity 21 36 91
minimumorderquantity 60 80 200
Wastefromminimumorderquantity 51 76 191
offcutaspartofwhole 0.5000000 0.5000000 0.2000000 0.2000000 0.0000000 0.0000000Isthislessthan50% No No Yes Yes Yes Yes
Flooringarea 810,000 mm2 810,000 mm2 810,000 mm2FlooringProductarea 2 3 9
Skirting/Cove
Perimetercondition(skirting/cove) 50 50 50 50 50 50
Sizeofskirting(nominal) 300 100 10
Floor/Skirtingjointcoordiantion Jointsalign Jointsalign JointsalignSkirting/Covecondition SetIn SetIn SetIn
Skirtingwastecalculationflooringsize(lessperimeter) 900 900 900 900 900 900
howmanyskirtingproductfitroom 3 3 11.84210526 #DIV/0! 4.712041885 #DIV/0!wholenumbersfitroom 3 3 12 #DIV/0! 5 #DIV/0!
Nouseofoffcutsfromonesideatother 0 0 0 #DIV/0! 0 #DIV/0!Revisednumbersfitroom 3 3 12 #DIV/0! 5 #DIV/0!
Skirtingproductquantity 9 #DIV/0! #DIV/0!Skirtingproductquantity(revisedforoffcut) 9 #DIV/0! #DIV/0!
Packquantity 30 40 100
Noofpacks 1 #DIV/0! #DIV/0!Wastefrompackquantity 21 #DIV/0! #DIV/0!
Minimumorderquantity 60 80 200
Wastefromminimumorderquantity 51 #DIV/0! #DIV/0!offcutaspartofwhole 0.0000000 0.0000000 0.1578947 #DIV/0! 0.2879581 #DIV/0!Isthislessthan50% Yes Yes Yes #DIV/0! Yes #DIV/0!
Flooringarea 810,000 mm2 810,000 mm2 810,000 mm2
Flooringmaterial Yes
EmbodiedEnergy /m2 /thisroomEmbodiedCarbon /m2 /thisroom
SequesteredCarbon /m2 /thisroomHazardouswaste /m2 /thisroom
SNRHWwaste /m2 /thisroomMixedWaste /m2 /thisroom
activewaste /m2 /thisroominactivewaste /m2 /thisroom
Skirtingmaterial Yes
EmbodiedEnergy /m2 /thisroomEmbodiedCarbon /m2 /thisroom
SequesteredCarbon /m2 /thisroomHazardouswaste /m2 /thisroom
SNRHWwaste /m2 /thisroomMixedWaste /m2 /thisroom
activewaste /m2 /thisroominactivewaste /m2 /thisroom
Groutingmaterial Yes
Percentageoffloorfinishzone %EmbodiedEnergy /m2 /thisroom
EmbodiedCarbon /m2 /thisroomSequesteredCarbon /m2 /thisroom
Hazardouswaste /m2 /thisroomSNRHWwaste /m2 /thisroom
MixedWaste /m2 /thisroomactivewaste /m2 /thisroom
inactivewaste /m2 /thisroom
Bondingmaterial Yes
Thickness mm
EmbodiedEnergy /m2 /thisroomEmbodiedCarbon /m2 /thisroom
SequesteredCarbon /m2 /thisroomHazardouswaste /m2 /thisroom
SNRHWwaste /m2 /thisroomMixedWaste /m2 /thisroom
activewaste /m2 /thisroominactivewaste /m2 /thisroom
Beddingmaterial Yes
thickness mm
EmbodiedEnergy /m2 /thisroomEmbodiedCarbon /m2 /thisroom
SequesteredCarbon /m2 /thisroomHazardouswaste /m2 /thisroomSNRHWwaste /m2 /thisroomMixedWaste /m2 /thisroomactivewaste /m2 /thisroominactivewaste /m2 /thisroom
Decoration/Finish/Sealer/Stain/Oil
Samesizerooms>differentsizefloorfinishproduct
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Lazy Architecture
• Simple repetition without differentiation
• No awareness of size
• Cut perimeters
• Wasted materials
18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams 86
Proactive Architecture
• Need to know the size of stuff
• Need to work with them not at odds
• Look after the edges the middle looks after
itself
• Keep it Simple
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I Can CAD, CAD can, So I Do
88 18/03/2013 10:26 © NGS 2002-2013 Waste At Design Diagrams
1000 x 1 or 1 x 1000
• 1000 bespoke sizes and shapes
– No large scale production runs
– Every one is handled slightly differently
– No simple packaging
– Labelling critical
– Production assembly and delivery sequence
vitally important
• Or 1 size x 1000 89
SMM7 Standard Method of
Measurement
• All shapes cut for closest rectangle
• All off-cuts are waste
• Accuracy +/-10%
• No concern about waste or site ordering
from quantities
• Contractor expected to re-measure
18/03/2013 10:26 90 © NGS 2002-2013 Waste At Design Diagrams
Glass Cutting SMM
If you want a shape you pay for a rectangle,
if the rectangle is paid for, nobody cares about waste 91
Glass Cutting CADCAM
tailoring = Iteration
18/03/2013 10:26 92 © NGS 2002-2013 Waste At Design Diagrams
CADCAM Tailoring = Iteration
• Maximising the yield from sheets of glass
• Many pieces arranged to get more pieces from
smallest glass pane
• Pieces cut from sheet
• Just like a tailor and fabric directionality is
important
• Potential conflict with ‘Roller Wave Pattern’ • RWP occurs as glass is rolled off zinc float and
‘slumps’ over supporting rollers
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12 m
Schedule all your
requirements before
determining the
optimum length to
minimise cutting waste
in the whole project
1 x 12m
2 x 8.0m
3 x 7.0m
5 x 5.0m
12 x 4.0m
25 x 1.0 m
12 m length works
But how many pieces?
8m 4m
7m 5m
4m 4m 4m
1m 1m 1m 1m 1m 1m 1m 1m 1m 1m 1m
1m
12 m length chosen as optimum size for 8m. 7m, 5m, 4m, 1 m lengths
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Natural Materials
have Natural
Variations Accept them or choose again
Slate production
• For every tonne of Welsh slates created
• 100 tonnes of waste
• Welsh use explosives
• China and Spain cut
from solid block
• Cheap slate competes
with Welsh unfortunately
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Slate use
• 1 tonne = 100 tonnes of waste at quarry
• Green Spots: 85% rejection at quarry
• More on site:
• We need to accept
natural variation
in natural materials
• Or choose again
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Articulation accepts variation
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www.capem.eu1 Design for
Construction &
Deconstruction
Fixings and Fastenings
Sequence and Layering
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Packaging
Deliveries
& Site Storage Prone to damage onsite
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18/03/2013 10:26
Design-in
material storage
for on-going
maintenance
101 © NGS 2002-2013 Waste At Design Diagrams
10m tonnes/a over ordered
• Provide space in the building to store
unused materials
• For snagging
• For 12 months defects
• For employer to maintain the building
18/03/2013 10:26 102 © NGS 2002-2013 Waste At Design Diagrams
Spares from batch for maintenance
• Long life buildings: lots of materials to
maintain over life
• BLE: Basement 500 year design life
• 1 store per fire compartment for spares
(PVC flooring)
• Retail: Fix spare balustrade parts
• Car park structure: bolt in spare railings
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© GreenSpec
• Brian Murphy BSc Dip Arch (Hons+Dist)
• Architect by Training
• Specification Writer by Choice
• Greening up my act since 1999
• Founder of www.greenspec.co.uk
• Just creating: www.greenspecdownload.co.uk
• E [email protected] [email protected]
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