British scientists…

Been watching with interest your channel. Though today been watching something more historical. And picked up a small snippet about Lime Plaster, and thought you may be interested. It was on the site
Inside The Fight To Save Henry VIII's Medieval Hunting Lodge | Historic Britain | Absolute History at the time of 16:57. Just a very short snippet, of the Lime plaster they are using to fix a Medieval Building.

Great fun! Can't wait to see the end result

For the technique and background of mixing and working hot lime mortars, it’s worth watching the Nigel Copsey Demo video/s.
The mix needs to slake at at least 100 degrees C and you need to be careful not to drown the mix with too much water nor burn it with too little… and probably not a good idea to mix in plastic buckets as the temperature can reach several hundred degrees C if you get the ratios or process wrong!

Such a good solution to the cement problem, and you'd never get a first coat of render on that thick. Brilliant work

certainly a vegetable fiber absorbs much more water in a mixture than other types of additions but it will be the cause of the spectacular insulation capacity it will have once dried. 💪

I know some folks in Golden Canada who built an earthship & plastered it with hemp plaster maybe 7 odd years ago. We have pretty extreme temps from as high as +40c to as low as -40c. They didnt plaster over stone though. Im sure they would be happy to talk to you on their experiences. They own eat pure mountain food in Golden if you wanted to get in touch. They do some amazing things on their off grid farm!

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See it the other way around! If you cannot find plasterers who can speak English in the interior of Portugal maybe you should take the opportunity to push yourself to learn some Portuguese. After all your are in Portugal.

Dunno if it’s been mentioned. So many comments on already. But have you thought about pre soaking the hemp ?

I think putting at least the first layer on by hand is correct – when they used to insulate houses with cowdung/straw/water in the old days (also a very fibrous and insulatin mix), it was put on by hand.

I think you need to listen to her. She is more focused than you on applying the mortor, you appear to be in a rush.

Soaking the hemp first and then flicking the mix at the wall could be time saving as once the wall is covered you would just need to float it level.

When you see a professional pointing a wall they seem to be able to flick it on and it seems to suction and hold that pointing with a trowel doesn’t.

Would make a good video and for the two of you no end of wrist action innuendo😉

So why not use plasterboard?

I like the practical experimental process which you used on this. It is not a disaster if it doesn't dry as it should once on the wall as you can always scrape it out and start again.

This process is sometimes done in Ukraine (also Russia and other eastern former USSR places). There are a few videos on YouTube if you search 'вапняна конопляна штукатурка'

I think you should hose down the stone walls before using either mix you had in this video. The thicker mix might be more useful on the bigger holes and the corners, and the thinner mix on the flat inner surfaces. A round-ended (pool trowel) might be easier to use than that big square trowel you had in the video.

Absolutely excellent work 👏

Hi Guys, Love your videos . I've watched a guy here in the UK. Called Kris Harbour who used lime plaster to do his walls in his buildings. He might be able to give you some more advice. Best of luck with this.

I have nothing to say really, but I appreciate your content, and wish to help with the yt-algorithms.

O man, this video shows why builders won’t do anything with this guys. They must have it very hard

We use linen fibers with CL90 and some fine sand for the finishing layer. The linen strands are somewhat finer I guess.

Love how you guys aren't afraid to experiment. Also, thank you for making me laugh – you guys are awesome!

Kylie, washing up gloves for cob or hempcrete, zero moisture coming through to corrode your skin, but yes, gets a bit sweaty. From what I have seen the lime mix is always applied in thinnish layers, very labour intensive, that’s why heritage building is so expensive. I’ve also often seen the first layer applied like a slurry and flicked on. Love your lime alchemy and the process of finding what works for you. Good luck 👍

A place you might find a lot of help with regard to lime. Lime render and plaster would be Kris Harbour Natural building. He is on here. A LOT of good info. Not only on building but also Growing food and keeping animals…

Hi guys ok i know nothing of what you doing there but just an observation. Wifie should not use her fingers the way she does she might be creating air pockets under the mix. The palm of her hand is fine. Then to finish. Use a damp sponge. I can c that looking great when dried. I love stuff like that. Wish i had more time to experiment with my own ideas. 😅😅👍💪

It should the builders using lime between the stones on the first place… now you would be having a much steadier house.

HELLO KYLIE & GUY…THAT WALL LOOKS SMASHING, ALBEIT WITH A WHOLE LOT OF FIDGETING, ETC. TO GET IT GOING…I DO HOPE YOU WILL LEAVE SOME OF THAT BEAUTIFUL OLD ROCK SHOWING IN THESE ROOMS…IT'S ALL VERY ENTHRALLING & I COULD SIT HERE FOR HOURS WATCHING ALL THIS, BUT, IT WOULD MAKE FOR AN INCREDIBLY EXHAUSTING EFFORT ON YOUR PART…STILL, I DO LOVE THE LONG VIDEOS…ALL THE BEST…🙏🏻;)

The downside of hemp is that it requires a lot of water to grow. This is not terrible if it's grown in a place with a lot of natural rainfall where it doesn't need irrigation, but if it has to be irrigated, it uses a lot more water than people think and is considered a water-intensive plant. It's also frequently grown with the use of a lot of pesticides, as it's susceptible to a lot of pests and diseases. So it's not quite the wonder plant that a lot of folks think it is, but like flax it can be very useful and versatile. Flax is another extremely sustainable plant and flax can be used like hemp in flaxcrete (like hempcrete), which is strong and has a lot of water and fire resistance.

i would have gone with much more wetter mix and throw it on walls. then spread -smooth out with finishing trowel. Since you are using hot lime, pre wet your wall before you stick mix on it. I also wonder if lime-wash coat wall then hemp lime layer (then lime plaster layer) on the wall helps?

It is so exciting seeing that entire bit of wall covered, in the name of experimentation!

Hemp is the future, hemp will replace plastic and it’s fast growing, great for clothing, win win!

How do you keep the hemp from rotting? If the goal would be to allow the rubble stone & masonry walls to breathe, humidity may reach and/or be held by the fibers. Wonder if this is better applied to living quarters above ground, rather than foundation walls at or below grade.

Recommendations I’m finding are 2 parts lime binder to 1 part hemp by weight . Add water a little at a time till you get the consistency you want. Important not to over due water. I’m sure you will find your perfect mix.

I watched other people with something similar and they throw it on the wall and then go back over it

They lied about the carbon in the atmosphere… we need carbon.

just my 2 cents worth… you use the very short cut hemp, shouldn't you use the long fibers like they use to make hemp rope ( 20-90 cm long fibers) ?

If I knew how to I would link in Chris Hawker of Hawkland Ecological Construction to see what he thought of your mix – he's a very experienced guy, really knows his stuff … let's hope he searches for his name occasionally …

I’m really glad Kylie is the one who said it looks like tuna mayonnaise, because that’s exactly what I was thinking! I think you guys are doing such a clever job of it, and once it’s on the wall it looks great!

Been using ty Mawr hemp lime .in pre mixed buckets 🪣 💪 I put it into a mixer water..First. it works even better if you mix it one day .then re mix it next day..do medium hemp first and trowel in a mesh..then fine hemp day after and rub up with a float..

I am still trying to understand what finish you look for the walls.
I’ve got the concern about “respiration” of the materials but missing the end point.
Can you make some samples and lab test them?

I wonder if pre-wetting the hemp fibers would be helpful in having the mix be more workable, and perhaps dry a bit more gradually. That might help with crack prevention as well as just being easier to mix with the lime and get on the wall into the nooks. Very interesting experiment.

I use that exact hemp in the UK to put in my raised beds as an organic, moisture retaining, bug repelling and soil nourishing material and is available on Amazon… love the idea of using this mix 👍
Great work 👏👏

I don’t know if you watch Laura Kampf on YouTube, really interesting piece on clay and straw bricks etc (subtitles needed for some of it) bit of a busman’s holiday for you two… https://youtu.be/Y0d2PAW6_rY

Hemp shop by me sell clothes ,shoes,handbags