- ability to be sourced locally
- durability
- embodied energy
- suitability to stormy and flood prone areas
Hempcrete
- Thermal mass - providing natural insulation
- Carbon sequestration
- The benefits and strength of concrete without the negative environmental effects of concrete
- Constructed within timber framing
- Hemp is fast growing
- Less manufacturing and embodied energy in lime used in hempcrete vs concrete
- Recyclable
- Fast growing - can be grown basically anywhere
- Strong and able to be used structurally
- Comes in many different varieties
- Long lasting if treated right
- Can do the same thing that regular plantation timber we use does with a lower carbon footprint
- Can be used in: scaffolding, walls, thatching, panelling, tiles, sheeting, flooring
- Used through Asian countries
Plantation Timber
- Slow growing, therefore larger areas needed for plantations
- Loss of biodiversity in plantation areas
- Strong and long lasting
- Often treated with chemicals during growth
- Mostly non native trees used
Earthships
Earthships are a really interesting construction looking at building into a hill or building earth up around a house. 'Earthships Building a zero carbon future for homes' by Mischa Hewitt and Kevin Telfer looking at how to build earthships and how they might be one of the best options for future construction.
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(Hewitt & Telfer 2007)
- Low carbon construction alternative
- Using thermal massing to passively heat and cool
- Ability to recycle all kinds of unwanted materials like tyres and glass bottles and aluminium cans
- When constructed right, can be autonomous and self sufficient - by reducing demand of resources and then seeking to use renewable sources to power remaining elements
References:
Hewitt, M & K Telfer. 2007. Earthships Building a zero carbon future for homes. Berkshire: IHS BRE Press
What to choose?
Really it seems like Bamboo is the best option because it is easy to grow on the site, easily accessible and shouldn't take up too much room. No matter what product I choose there will be an element of loss of biodiversity in creating a plantation to grow the products. Although I really like the idea of building some earthships into the hill, I'm not 100% sure about drainage issues if there is going to be a lot of water. I do love the idea of earthship constructions though. I'm not sure if the hempcrete will be necessary for construction either.