WE CARE ABOUT THE WORLD YOU LIVE IN
BUILDING WITH HEMP
When hemp hurd (the woody core of the stem) is mixed with a lime binder and water it petrified into a biocompsite substitute commonly known as Hempcrete. Hempcrete is lightweight cementitious insulating material weighing about a seventh or an eighth of the weight of concrete. Fully cured hempcrete blocks float in a bucket of water
Hempcrete has significant advantages over concrete. It is breathable, fire resistant and a good insulator, and can be used as a fill around a timber frame, as a finishing plaster, or to build freestanding walls.The Hemp plant absorbs atmospheric CO2 during the plantgrowth phase, and again as the material gains strength andmatures. (100sq m with 300mm thick walls) will lock up 7.9 tonsof CO2 in the walls. Estimated rate of carbon sequestration is165Kg CO2 capture/m2. Therefore, building with Hempcrete reduces atmospheric CO2
EXCELLENT THERMAL INSULATION CHARACTERISTICS
Tests of the thermal conductivity of walls by Plymouth University led to an agreed reading of 0.08w/mK. These were taken on a 200mm thick wall that had been constructed a number of years earlier. The “R” value (thermal resistance) is 2.75 with plaster and surface resistances taken into account. “U” value (rate of heat loss or gain) derived from this would be in the region of 0.36 -0.37W/m2K. This empirical work confirmed a lambda value of 0.08 – 0.09 for hemp and lime and as this conservative figure has been confirmed by so many authorities that it seems to accept this when making building regulation applications. (Bevan and Woolley, 2008)
Hempcrete regulates the temperature and humidity of a building; in some cases completely eliminating the need for heating and cooling systems, resulting in huge energy savings. Hempcrete is carbon negative and the obvious choice for buildings aiming to achieve a low carbon footprint and the highest sustainable building code levels.
Excellent Acoustic Isolation
Hempcrete has very good acoustic components due to its open structure. Hempcrete has a low propagation rate, a figure of ~900Vson m/s against steel with ~6110 Vson m/s. Hemp concrete is characterised by its high porosity that combines the microscopic pores of its binder and its vegetable particles, and bigger pores between the particles. Thus, its sound absorption is intermediate between the excellent absorption of hemp shiv, and the reflexion of the binder.
Fire Retardant, Termite & Rodent Resistant
Fire tests on a 300mm thick Hempcrete wall gave 73 minutes, for structural adequacy/integrity/insulative capacity. Based on the reported performance under full-scale fire exposure and the similarity of exposure and performance criteria between AS 1530.4-2005 and BS EN 1365-1:1999, Tradical® Hempcrete Wall System as reported in BRE Test Report number 250990, would be capable of achieving an FRL of 73/73/73, if tested in accordance with AS 1530.4-2005.
Further tests are being undertaken by the labs of Cesa, St Estier limes in France. John French, a leading Queensland and international entomologist, has tested Hempcrete in the Northern Territory and Queensland found termite have no effect on the Hempcrete samples.
The material is mixed in mortar mixers for 1-2 minutes and stuffed by hand into the wall cavities. The wall is slip-formed with temporary wooden or plastic “shuttering” forming the inner/outer surface forms. The material is lightweight and can be moved easily about the site in tubs and passed up bucket-brigade fashion to workers filling the cavities. Site clean-up is easy. Simply till it into the soil The material is finished on the outside with a hard render coating about 20mm thick to protect it with a final colored topcoat finish added. The end result appears like any stucco finished building. The inside can be left natural or finished with lime plaster for a traditional look.
The material is finished on the outside with a hard render coating about 20mm thick to protect it with a final colored topcoat finish added. The end result appears like any stucco finished building. The inside can be left natural or finished with lime plaster for a traditional look.
Hemp itself is a beneficial crop requiring no fertilizer, weed killer, pesticide or fungicide. It grows so thickly that weeds cannot grow. Farmers grow it in rotation with other crops such as barley or rye. The crop following the hemp requires no weed killer because the hemp has driven weeds out. The hemp seed is harvested as a nutritious food supplement rich in Omega-3 oil, amino acids, protein and fiber. It is considered a “super food”. The outer fibers are used for cloth usually as a blend with 45% cotton. The woody inner core is chopped to uniform size for our use. It has been traditionally used as animal bedding
INTRODUCTION TO TRADICAL®
Tradical® Hempcrete is a unique, highly sustainable construction product for the creation of insulating walls as well as insulation layers for roofs. Tradical® Hempcrete is a blend of specially prepared hemp shiv and a special lime based binder Tradical® PF70. Together these products form a bio-composite building material that can be used both for the creation of buildings that have excellent thermal and acoustic properties as well as creating a healthy living and working environment.
Additionally, Tradical® Hempcrete has the ability to make an impact on the future of sustainable building. Helping to reverse the damaging effects of greenhouse gases, Tradical® Hempcrete locks up approximately 110kg of CO2 per m3 of wall and provides one of the best value materials for low impact, sustainable and commercially viable construction.
Produced mainly from renewable sources, Tradical® Hempcrete is mixed on site for fast track construction and delivers high levels of insulation, air-tightness and vapour permeability.
Benefits And Capabilities
Combining patented formulations of air-lime based binders with the chopped core of the industrial hemp plant stem, delivers a suite of new building products. These Tradical® Hemp Lime products have excellent performance characteristics for durable, healthy, sustainable and ecologically sound buildings.
Tradical® Hemp Lime products deliver excellent application, durability and aesthetic performance characteristics combined with sustainability, economic, comfort and health qualities that architects, developers, contractors and customers will value.
- Comfort & Health
- Carbon Balance
Tradical® PF: these ready-to-use pre-formulated binders combine air lime and hydraulic binders so that you get the best of both for your projects. To be used in brickwork and blockwork, rendering & plastering
Tradical® PF is a product line of different air lime-based pre-formulated binders to meet all needs in terms of building masonry, rendering and plastering in the renovation and new build market segments.
Tradical® PF incorporates in one mixed product all necessary ingredients to make high-quality/high performance air lime mortars compatible with all kinds of wall structures.
Tradical® PF brings all the necessary performances for a successful masonry work: