Hemp/clay spray and cork roof insulation update

[@elspethfougere9683]

Awesome!! Thank you so much for sharing this!! I love seeing the Cork in use over the hemp clay, I can imagine how lovely that's going to be to live with, for sound as well as warmth. Looking forward to the next update

[@williamstanwix]

I know I can’t wait to get in there! I’m also going to try spraying cork granules and clay instead of hemp and clay.

[@wadeatteberry6377]

Wow absolutely incredible I am very impressed with your attention to detail.

[@williamstanwix]

Thanks Wade, I really appreciate it when people notice the little things. Even tiny design details can make such a difference to the ease, cost and finish of a job.

Thank you so much.

[@OneShot_WOLF]

Can I ask about your herd/binder mix? Im not familiar with clay binders :) super curious

[@williamstanwix]

I was using powdered clay and the same ratio that I would use with lime binders so it was around about 1 part clay to 3.5 parts shiv/hurd by volume. But I put half the amount of water than I usually would with lime. I was using my spray machine so the actual ratio was about 40kg of powdered clay to 200litres of shiv/hurd.

[@emmaslow]

Liking the sprockets! Are the cork boards just laid loose or are the layers stuck down?

[@williamstanwix]

They are laid loose then I have screwed a 1”x2” counter batten over them to sandwich them down. Then the tiling batten gets nailed to the counter batten.

[@colmbrosnan195]

Is the blue material a vapour barrier? Is it installed directly on top of the cork?

[@williamstanwix]

Hi, it’s a breathable membrane, it stops moisture entering the building from the outside but is very good at letting moisture from the inside escape. Yes I’ve installed it directly over the cork.

[@binmanblog]

Hi Will, Why use clay powder instead of lime? Will hemp / Clay work for for walls and what is the difference in "U" values?

[@williamstanwix]

Hi Steve, it’s mainly an embodied energy thing. Clay hasn’t been burnt and can be from the building site itself so it has a lot less embodied energy than lime. It’s not as resistant to the whether as lime and in a wall would probably want protecting with cladding rather than a render. I have used it in walls also and will be experimenting more with it as time goes in. In terms of thermal conductivity and U-values I had samples tested and they were the same as hemp lime at the same density. I recently did a build where we processed the clay spoil from site in my roller pan then used the resulting clay slip to spray hemp clay as the walls.

[@gerigame2995]

Whats the name kf yoir company or where are u based yo get this done