New Homes Construction Overview To Code 4 Long Meadow, Diss Mark Hart Divisional Construction Director

How to get to Code 4 Carefully considered design to suit the location and existing facilities 100mm CFC interlocking insulation to ground suspended slab Bespoke timber frame system Hemcrete insulated walls and Hemp fibre roof insulation Air source heat pump heating and hot water Mechanical Ventilation and Heat recovery Airtightness to 3 Life time secured by design Fully recyclable materials New Homes overview to Code 4 - LONG MEADOW - DISS

Site Longmeadow, Denmark Lane, Diss, Norfolk 1st phase of 29 new homes of a 3 phase development of 114 –2, 3 & 4 bedroom homes Traditional sub-structure with bespoke timber frames for Hemcrete product Element of affordable housing supported by grant funding New Homes overview to Code 4 - LONG MEADOW - DISS

Hemp Material Grown locally to development and processed at Halesworth Grows fast from seed to 4 metres within fourteen weeks Consumes C02 during growth Strong and very good insulator once processed New Homes overview to Code 4 - LONG MEADOW - DISS

Pre planning To integrate various works Scaffold Services Cranage Timber frame Airtightness Life time products New Homes overview to Code 4 - LONG MEADOW - DISS

Sub-Structure Typical sub-structure as used on most housing sites Trench fill concrete foundation with brick and block to over site level Overall size to suit timber frame and Hemcrete = 300mm Standard drainage and services Concrete Beam and interlocking polystyrene blocks create fully insulated floor structure DPC & DPM covers complete oversite New Homes overview to Code 4 - LONG MEADOW - DISS

Scaffold Bespoke scaffold for timber frame and Hemcrete New Homes overview to Code 4 - LONG MEADOW - DISS

Roof structure Erect roof trusses in position on the sole plates at ground level Remove to adjacent level storage New Homes overview to Code 4 - LONG MEADOW - DISS

Timber Frame Erect ground floor timber frame, –which is pre-constructed to suit the Hemcrete product, Internal multipro board as internal shutter Floor cassettes, Followed by 1 st floor timber frame Lift finished truss structure into position New Homes overview to Code 4 - LONG MEADOW - DISS

External Services Fix all external services, ducts and boxes, any timber back ground must be fixed ready for all future external structural elements, such as balconies or porch roof structures, with all penetrations carefully sealed for air tightness New Homes overview to Code 4 - LONG MEADOW - DISS

Formwork Erect two sections light weight plastic form work to external substructure brickwork –ensuring precise dimensions –level and plumb Fixed into position with spacers and bespoke fixing screws Timber battens are fixed to the timber frame at each level to create stability between Hemcrete and timber frame New Homes overview to Code 4 - LONG MEADOW - DISS

Hemcrete Installation Hemcrete is batched and mixed on site Hand poured into the shutter at approx. 600 layers, Shutters are removed from lower level and used to continue as works proceed Seamlessly installed around the complete envelope of the building Contributing to an airtight insulated shell New Homes overview to Code 4 - LONG MEADOW - DISS

Curing Process Once cured after 1-2 days shutters are removed to expose a firm tactile structure which will need to fully cure over the following 4 weeks or so –according to weather conditions, Once cured a robust shell is created New Homes overview to Code 4 - LONG MEADOW - DISS

Internal Services During the Hemcrete stage internal services and fit out are carried out Followed by window and door fixing Fully seal all penetrations New Homes overview to Code 4 - LONG MEADOW - DISS

Roofing Roofing and roof lines are completed once formwork is removed Loading of the roof tiling needs to be delayed to allow shrinkage of timber frame and Hemcrete Hemp insulation quilt is laid to the roof void areas New Homes overview to Code 4 - LONG MEADOW - DISS

Rendering or Cladding Once full drying of the Hemcrete has been achieved and all apertures solutions are fixed, rendering or cladding can be finalised New Homes overview to Code 4 - LONG MEADOW - DISS

Airtightness Airtightness requires careful management All construction stages from DPM to pre-plastering need to be carefully completed Airtightness barriers installed as design All service penetrations need to be fully sealed Airtight sealants applied to window and door apertures prior to plastering Sealing around window boards and within service voids are important New Homes overview to Code 4 - LONG MEADOW - DISS

MVHR Fresh outdoor air is taken into the Mechanical Ventilation & Heat Recovery System which then passes through the filtration system to reduce the incidence of pollen and dust. Air removed from the house is passed through the HRV System to 'transfer' the heat to the Air taken in from outdoors, before being passed to the outside The heat exchanged warm air taken from outdoors is then carried to specific rooms Condensation from poorly ventilation rooms and smells are taken from rooms (i.e. Kitchen, Bathroom, Toilet) to be dispensed outside. New Homes overview to Code 4 - LONG MEADOW - DISS

Electric Air Source Heat Pump Mitsubishi Ecodan domestic models installed Provides space heating and hot water for all the household needs Captures ambient heat from outside air and upgrades it to useful temperatures for heating hot water and radiators Best performance in well-insulated homes connected to underfloor heating As the insulation and air-tightness of the property are at a very high level, the house design is ideally suited for the heat pump New Homes overview to Code 4 - LONG MEADOW - DISS

Conclusion Design elements need to be selected to suit the location Hemcrete has excellent insulation properties, with limited additional on site requirements Timber frame is similar in design as traditional, but bespoke to suit the construction Careful pre-planning is required to ensure seamless installation on site Scaffolding requires careful adjustments to give safe working platforms as works proceed The drying process of the Hemcrete and the lime render is subject to weather conditions Airtightness is an important element Triple glazed windows and doors, secured by design and lifetime certified MVHR units ensure additional energy savings and comfortable air circulation Electric air source heat pumps provide single source energy effective heat solution Once completed the structure provides a practical, environmentally friendly alternative to traditional masonry built structures, creating a peaceful, comfortable and economic living environment Recycling ethos is embedded within the whole concept Bring on Code 5 & 6 New Homes overview to Code 4 - LONG MEADOW - DISS

I am happy to answer any of your questions. I will also be available to answer your questions after the presentation. New Homes overview to Code 4 - LONG MEADOW - DISS