construction green breakfast - you don't have to be a hippy to build with hemp!
DESCRIPTION
Blake Lapthorn solicitors' Constuction team held a breakfast seminar on building with hemp on 28 February 2013.TRANSCRIPT
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You don’t have to be a hippy
to build with hemp! Ian Pritchett
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Contents
• Overview of Lime Technology Group
• Background to Tradical® Hemcrete®
• Hemclad® & Hembuild®
• Thermal performance
• Unique funding model
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Questions
• Which is lower cost?
– £5,000
– £100 per week
• What is the difference between cost and
value?
• What make people choose – cost or value?
• Who drives a BMW?
24 February 2013 3 www.limetechnology.co.uk
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Lime Technology Group
• Lime Technology Ltd. - manufacturers and
suppliers of breathable construction products:
– Lime mortars, plasters & renders
– Insulation products
• Hemp Technology Ltd. – largest hemp
processing factory in Europe
• Hemcrete Projects Ltd. – specialist “design &
build” sub-contractor
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Joseph Chamberlain College
Limetec® Mortar
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CTRL Terminal, St Pancras
Limetec® Mortar
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7
Industrial Hemp
Fibre
s Shiv or Hurd
Seed
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Hemp Harvesting in UK
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Hemp Drying
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Hemp Baling
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Hemp Processing (Suffolk)
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Fuel Briquettes (from waste)
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Breathe® Insulation (from fibre)
•
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BMW – Door Panels (from fibre)
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Lotus Eco-Elise body shell
(from fibre)
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Hemp Shiv (woody core of stem)
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Tradical® Hemp Binder (HB)
Production (Oxfordshire)
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Tradical® Hemcrete®
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New Technology
From Hemcrete® to Hembuild®
• Traditionally Tradical® Hemcrete® was cast or
sprayed in a wet site process
– 6 to 8 week drying period (in good conditions)
– Best suited to use between March and July
• Now you can get all the benefits of Tradical®
Hemcrete® in an off-site panelised system that is
dried before it gets to site
– Hemclad® and Hembuild® panels
– No seasonal/weather restrictions
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Hembuild®
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U-values & Y-values
• 5 standard U-values
– 0.19 W/m2.K
– 0.17 W/m2.K
– 0.15 W/m2.K
– 0.13 W/m2.K
– 0.11 W/m2.K
Excellent Y-values
Typically 0.02 to 0.04
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Benefits
• Grown and manufactured locally
• From renewable/abundant sources
• Lock up carbon
• Thermal stability from insulation and
thermal inertia
• Fire resistance
• Warranties and accreditations
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Embodied Carbon
-40
-20
0
20
40
60
80
100
Embodied
Carbon
Cavity wall
Clay block
Hemcrete
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Affordable Housing
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Affordable Housing
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Private Houses
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Private Houses
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Hemcrete® Buildings
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Hemcrete® Buildings
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Hembuild® & Hemclad®
• Bespoke Panels
• Designed to fit your building
• Designed by our engineers – To accommodate vertical loads
– To accommodate wind loads • In plane (racking)
• Out of plane (bending)
• Can be used with primary structural frame – Hemclad®
• Can be used without a primary frame for low rise buildings – Hembuild®
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Hemclad® - M&S Cheshire Oaks
• 4 year lead in
• Design support to client team
• Manufacture of 2600m2 of Hemclad®
panels
• Site erection of Hemclad® panels
• 100% FSC chain of custody
• U-value of 0.12W/m2.K
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Hemclad® - M&S Cheshire Oaks
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Hemclad® - M&S Cheshire Oaks
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Hemclad® - M&S Cheshire Oaks
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Hemclad® - M&S Cheshire Oaks
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Hemclad® - M&S Cheshire Oaks
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Hemclad® - M&S Cheshire Oaks
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Hemclad® - M&S Cheshire Oaks
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Hembuild® - Passiv Haus
• Brick (& lime mortar) faced private house
• Passive Haus specification
• U-values
– Walls – 0.11W/m2.K
– Roof – 0.1 W/m2.K
– Minimal thermal bridging
• Air-tightness – 0.6 air changes per hour
• Built using Hembuild® system
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Hembuild® - Passiv Haus
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Hembuild® - Passiv Haus
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Hembuild® - Passiv Haus
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Hembuild® - Passiv Haus
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Hembuild® - Passiv Haus
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Hembuild® - Passiv Haus
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30 year costs
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60 year costs
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Hempod- 200mm thick walls
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Standard Cast
on-site Wall
System
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Thermal damping
~80% for 200mm thickness
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Humidity control
~95% for 200mm thickness
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Science Museum Archive
• Putting theory into practice
– Based on Bath University test data
• 10,000 Sq ft, 3-storey archive
– Sits within a WWII concrete aircraft hangar
– Steel frame (10KN floor loading)
– CLT floors (160mm & 100mm roof slab)
– Hemclad® walls (200mm)
– 40mm wood fibre board cladding
• Using the Hemcrete® to passively control temperature & humidity
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Cast panels – 200mm thick
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The hangar
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Cross Section
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Completed Archive
Photo courtesy of Jennie Hills/Science Museum, London
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Thermal modelling
• Used external measured weather data from the site and the building geometry to create an IES simulation of the Hempod
• Ran IES model of the SIMULATED performance of the Hempod
• Exported results into a Fourier format
• In parallel we created a Fourier model of MEASURED internal temperatures in Hempod (test building)
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Thermal modelling
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Thermal modelling
• Created a mathematical relationship between Fourier models of IES SIMULATED and MEASURED internal temperatures in the Hempod and obtained a Fourier “filter”
• Built and run IES model of the Science Museum Archive
• Applied the (same) Fourier filter to the internal temperatures obtained from IES SIMULATION to obtain best PREDICTED performance
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Fourier filter applied to IES simulated temperature (by Dr L. Jankovic, Emission Zero R&D)
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Fourier filter applied to IES simulated relative humidity (by Dr L. Jankovic, Emission Zero R&D)
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M&E System Spec.
• Air handling unit system reduced from
30KW to 5KW peak load
• 2KW average load
• Power from PV array
• M&E cost reduced by 75%
• Reduced on-going maintenance costs
• Cheaper than a block-work archive!
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On-going Monitoring
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Thermal Performance
• Tradical® Hemcrete® exhibits a dynamic
thermal performance that greatly exceeds
that predicted in conventional thermal
modelling software (IES)
• Quantifying this performance shows that it
is a cost effective building material
• This is currently an experimental
approach, but it is backed up by real
monitoring data on nearly 40 buildings
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Future Thermal Modelling
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Future Thermal Modelling
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Future Thermal Modelling
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Cost Efficiency
• Modelling shows heating system can be
reduced from 17KW to 4KW (peak)
• Saving on heating system off-sets the
extra cost of the Hembuild® walls
• Cost neutral on construction
– Lower running costs
– Lower maintenance costs
– Lower CO2 emissions
• True sustainability!
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A Unique Team
• Lime Technology Group
• Amalgamated Capital
• Mark Hines Architects
• The Green Organisation
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What we offer…
• Fully funded projects
– 30 year commercial bonds
– Retention of appreciating assets
• Innovative building system – Hembuild®
– Exemplary thermal performance
– Local manufacture & local jobs
– Natural materials - hemp & timber
• Contemporary design & master-planning
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AmCap USP’s
• Bond is provided up-front to finance the delivery
of the whole project
• Bond is based on income potential of the houses
• Bond interest rolled up during construction
period
• Debt sits off the RP’s balance sheet
• Asset reverts back to RP after 30 years
• The ideal balance between ease, cost and
value!
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Summary
• Fully funded projects
– 30 year commercial bonds
– Retention of appreciating assets
• Local manufacture
– Local jobs
– Natural materials - hemp & timber
• Contemporary design & master-planning
• Exemplary thermal performance
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The best way to
predict the future
is to create it