We chose wood fibre because we wanted the house's CO2 footprint to be as low as possible. We are slightly above passive house levels in terms of ongoing energy use (mostly because the house has an inefficient shape = not a cube) and we produce more kw/h from solar power each year than we use despite having a relatively inefficient electricity-based heating system. But we also wanted to reduce the CO2 emitted during construction and cement/concrete is really bad in that regard.
The wood fibre insulation has a fraction of the embodied energy/CO2 emissions of concrete and fossil fuel based insulation and it is fully compostable. I could theoretically also be reused if the house is demolished at some point, as it doesn't deteriorate if it stays dry (or is allowed to dry quickly after getting wet), though I think that would be unlikely to happen. Also, wood fibre is an excellent insulator against heat, which is nice given that our summers can get quite hot.
The wood-only construction also eliminates all thermal bridges, as wood is itself an insulator and the required fasteners are small diameter and do not reach through the entire wall.
We chose wood fibre because we wanted the house's CO2 footprint to be as low as possible. We are slightly above passive house levels in terms of ongoing energy use (mostly because the house has an inefficient shape = not a cube) and we produce more kw/h from solar power each year than we use despite having a relatively inefficient electricity-based heating system. But we also wanted to reduce the CO2 emitted during construction and cement/concrete is really bad in that regard.
The wood fibre insulation has a fraction of the embodied energy/CO2 emissions of concrete and fossil fuel based insulation and it is fully compostable. I could theoretically also be reused if the house is demolished at some point, as it doesn't deteriorate if it stays dry (or is allowed to dry quickly after getting wet), though I think that would be unlikely to happen. Also, wood fibre is an excellent insulator against heat, which is nice given that our summers can get quite hot.
The wood-only construction also eliminates all thermal bridges, as wood is itself an insulator and the required fasteners are small diameter and do not reach through the entire wall.