Hemp Shiv: facts from Tradical draft

Ecoshakes in Ontario

http://www.enviroshake.com/why-not-cedar/cost-comparison

hemp org

http://www.hemp.org/news/hempcrete-hemp-building-materials

enviroshakes

hemp strawe bale house

http://www.ontariohempalliance.org/news/bailraising.html

straw inside and hemp coating

http://www.greenbang.com/hemp-and-straw-house-of-future-goes-up-in-bath_10781.html

hemp house on saltspring

hemp is hard to cut

http://www.canada.com/victoriatimescolonist/news/story.html?id=752502e4-79d7-43ca-9c77-f5c87b7e4477

unusual houses

http://naturalhomes.org/natural-building-1.htm

Practical Information from Tradical

http://www.lhoist.co.uk/tradical/hemp.html

Hemp Agronomy 1 Hectare = 2.5 Acres

  • 1 Hectare will produce up to 10Te of hemp (UK average is 8T)e
    60% of the processed hemp crop is shiv
    1Te of shiv is approx. 50 bales
    1 bale of Tradical® HF (hemp shiv) contains 200 litres when uncompressed
    1 Hectare will produce 5 to 6Te of shiv (250 to 300 bales)
    1 Hectare will produce enough shiv to build a small house

Carbon Dioxide

  • 1 Hectare of hemp will absorb up to 18Te of CO2 as it grows (total crop – shiv, fibre and dust)
    The shiv from 1 hectare contains about 10 to 11Te CO2
    Tradical® Hemcrete® Standard Wall mix captures 130kg CO2/m3 (at a density of 275kg/m3)

Walls of Houses

  • A small semi detached house of 48 m2 GFA with 300 mm thick walls, contains 33 m3 of Tradical® Hemcrete®
    For the Standard Mix this is 165 bales of Tradical® HF and 5.4Te of Tradical® HB.
    This will lock up 4.2Te of CO2 in the walls
    A small detached house of 52 m2 GFA with 300mm thick walls, contains 49 m3 of Tradical® Hemcrete®
    For the Standard Mix this is 245 bales of Tradical® HF and 8.1Te of Tradical® HB.
    This will lock up 6.3Te of CO2 in the walls
  • A larger detached house of 100 m2 GFA with 300 mm thick walls, contains 72 m3 of Tradical® Hemcrete®
    For the Standard Mix this is 360 bales of Tradical® HF and 11.9Te of Tradical® HB.
    This will lock up 9.3Te of CO2 in the walls

Thermal Performance – U-Values
300 mm Standard wall mix gives U value of 0.19 W/m2.K
Drying

High humidity levels and low temperatures can inhibit drying of Tradical® Hemcrete®

Careful planning and preparation is required to minimise drying times through provision of proper protection to drying Tradical® Hemcrete®from rain and frost.  It can be appropriate to use air movers, heaters and dehumidifiers to shorten drying times during wet weather, cold periods, winter conditions or when building in exposed locations.

END

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