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Building With Hempcrete

 
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Jam Lady



Joined: 28 Dec 2006
Posts: 1792
Location: New Jersey, USA
PostPosted: Wed Jan 31, 18 2:30 am    Post subject: Building With Hempcrete  Reply with quote    

Not sure in which forum this should go. Hempcrete (using Cannabis sativa, not C. indica.)

https://www.nytimes.com/2018/01/29/science/hemp-homes-cannabis.html?hp&action=click&pgtype=Homepage&clickSource=story-heading&module=second-column-region&region=top-news&WT.nav=top-news

Sounds quite interesting

Mistress Rose



Joined: 21 Jul 2011
Posts: 9200

PostPosted: Wed Jan 31, 18 8:22 am    Post subject: Reply with quote    

Interesting article. Hemp used to be grown in the UK for rope and clothing manufacture, but these days with the link of cannabis, although they are two different types, any grown has to have a licence as far as I know. The article isn't too clear, but it seems to indicate that the same part is used for the hempcrete as would be used for cloth. I suppose if a lot was grown, the better quality stuff could be used for cloth and the poorer for building.

tahir



Joined: 28 Oct 2004
Posts: 44006
Location: Essex
PostPosted: Wed Jan 31, 18 9:47 am    Post subject: Reply with quote    

I did look at it as a material for our house but didn’t use it in the end. No idea what happened to it in the uk

tahir



Joined: 28 Oct 2004
Posts: 44006
Location: Essex
PostPosted: Wed Jan 31, 18 1:29 pm    Post subject: Reply with quote    

Looks like it's still around:

https://www.ukhempcrete.com/

dpack



Joined: 02 Jul 2005
Posts: 33287
Location: yes
PostPosted: Wed Jan 31, 18 3:19 pm    Post subject: Reply with quote    

only slightly off topic , straw ( or wood wool ) and cement based stuff can be ok for some things.

if i was going for a long term structure ,stones, ceramics, time tested mortars and maybe the odd bit of reliable metal ( the bronze pin + hot poured lead adhesive thing seems to work but good stainless steels have some prospect of longevity) . any timber and most metal should be "plug n play" if planning for millennia

Mistress Rose



Joined: 21 Jul 2011
Posts: 9200

PostPosted: Thu Feb 01, 18 7:27 am    Post subject: Reply with quote    

It looks as if hempcrete isn't strong enough for structural work, but used in conjunction with a wood frame. Probably a good alternative to other infills used that way, and being water permeable, with a good lime rendering, it should make a reasonably long lasting wall. It is all going to be in the framing material so good oak heartwood should last well.

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