External cladding: Larch and lime
Now the straw walls of our eco-classroom at Castle Hill School have had their first coat of lime render, it’s time for the cladding.
We’re using Scottish-grown larch boards – a durable hardwood which will naturally mature over time to an attractive silvery grey.
Other parts of the building have been simply rendered using traditional lime, a material often used on straw buildings. Lime is a carbon neutral building material, created by burning limestone. When lime is applied to any surface, the carbon dioxide released during the burning process is re-absorbed as the render dries.