Construction green breakfast - you don't have to be a hippy to build with hemp!
You don’t have to be a hippy to build with hemp! Ian Pritchett
Contents• Overview of Lime Technology Group• Background to Tradical® Hemcrete®• Hemclad® & Hembuild®• Thermal performance• Unique funding model
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 www.limetechnology.co.uk 3
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
New TechnologyFrom 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
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®
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
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
Completed ArchivePhoto courtesy of Jennie Hills/Science Museum, London
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)
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
Fourier filter applied to IES simulated temperature (by Dr L. Jankovic, Emission Zero R&D)
Fourier filter applied to IES simulated relative humidity (by Dr L. Jankovic, Emission Zero R&D)
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!
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
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!
A Unique Team• Lime Technology Group• Amalgamated Capital• Mark Hines Architects• The Green Organisation
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
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!
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
The best way topredict the future is to create it