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You need to be very careful with quick lime.

Great! Thanks a lot! Best regards from Russia!

type s limes are said to have the properties desired here: high water retentivity, good workability. why do folks say they are inferior (aside from the lower calcium content)

I have watched so many videos on lime mortar for repointing old buildings. My terrace in york has been repointed in cement. The brickwork is getting ruined. What sands should I use in a mix. Washed, unwashed, fine sharp, course sharp. Colour? I am going to have to tackle the job myself. Will start on garden walls to get some practice in. I have ordered your book . Have decided that hot lime is the way to go not NHL as I have been recommended. Pozzalan or not. Any advice please.

what is the hurry ? and why is the mortar so wet ? its going to take along time to carbonate. never seen hot lime like this before , you are going to be waiting along toe before you can do the next course with it been so wet

Does anyone recommend hot mixed mortars for exterior plaster on straw bales? With or without pozzlans?

Just like the Roman’s and Chinese.

Greatly appreciate your research and knowledge - thank you!

Nigel in Quebec made "a volcano" when he slacked lime but in recent videos he just mixed everything together. Did he change the method?

Is it the heat that can really help bonding the materials together ? They must of enjoyed experimenting and competing on best practices ?

In my experience as a plasterer I would have to agree that finer sharp sand works better. I've now done an entire room, walls and ceiling with an earth-lime-hay mortar. I've experimented with different loams, different ratios, different fibers, different types of sand and what I can say with much confidence is that there are two things that cause shrinkage cracking: 1. too much clay and not enough sand 2. too coarse sand Much to my surprise, and very much by (happy accident) I found myself one day stuck with the "wrong" type of sand but I really wanted to get a wall done. So I said screw it, and just used this finer sand. And to my surprise it was a pleasure to apply, it floated MUCH easier and after drying there were no cracks. NO cracks and in some places the plaster was up to 8 cm thick. Ever since, I've been using the finer sand to mix with loam. A pleasure to work with and honestly, really not that dangerous. I've had some of my lime-earth mortar in my eyes on many occasions and honestly, I've never even used water to rinse it out as I find that it doesn't really burn. I figure there's not enough lime in the mix. And I've had NHL in my eye before and that was a bloody nightmare. Red eye for two weeks! Of course I'm not advising anyone to not treat earth lime mortar with respect, but then again, in my experience it's not really super dangerous. I can plaster for days and weeks without gloves and my hands are fine. Every now and then, once or twice a week I just apply a fat hand creme and that's it.

wow and I learned to add cold water to lime in small quantities in order not to "drown" lime because it will not "burn" 😮😂

Smailholme Tower in Scottish Borders on one of the pictures. Built in 1600 and something but refurbished along the way. Not sure whether it's been repointed during refurbishment, but current hot lime mortar or lime putty , I would think is at least 200 years old. It's still so hard, because I think proper carbonation is mind blowing. People knew their craft back then but today some people will say that lime mortar doesn't last! Ha ha. Thank you for this presentation.

Such powerful information ( and so "many" subscribers ). I'am from Russia I bow my head Sir. Thank you very much!

Is this a reupload, or did I watch it on another channel a couple years ago?

Someone get this man a lavalier mic

Critical info, many thanks 👍

Hi Nigel you mentioned chimneys. I’ve got a late Victorian house with quite a high chimney stack consisting of red facing bricks capped off with 4 course of blue engineering bricks. I can tell a lot of the original mortar wants replacing and some of the brick faces have blown. Given how exposed it is would repointing with a hot mix be appropriate? Many thanks.

I hear so many people speak about trials, tests and studies carried out on NHL's, but can never find them online. Can anyone please link me to these reports?

Love listening to people in the uk using centigrade, litres, millimetres etc.

Other question: what is "earth lime mortar "? Cause in france we have inded mortars with clay but ther's no lime in it ...

Hi again, what is "linsi oil "i don't understand the term in english ?

Hi Nigel, i'm from France, very nice video, really interessing. inded, in France "lime wash", ( we call it "peinture à la chaux") is made with 2 or 3 coat max, but on the outside wall, with more water, because it dryes to fast, i will check your others videos, thanks for scharing. I'm just a bit woried about your hands, because, you touch the lime without any gloves..???😬

Thank you for producing this video. I was struggling to understand how lime harling works for some renovation work I need to organise and this explanation was really clear and helpful.

How would you do big quantities?

Have you got a mask on?

Asia , use sticky rice and anti bacteria powder to make hard concrete

I'm part way through your book at the moment, but this is really interesting to hear the commentary as you go through as well. Thank you for sharing.

Very interesting and clarifying discussion, particularly the discussion of relative capillarity of stone and mortar working together, which makes a lot of sense when explained from the physics standpoint of capillary action.

This is absolutely exhilarating stuff. The implications of your findings heralds a renaissance in the art and craft of masonry. We look at modern buildings and we frown; yes the intent is good, but the execution is not. We've been deluding ourselves with marketing fluff and lusting for quick fixes to overly complex code requirements. Thank you so much for sharing this knowledge! It is priceless. I was extremely surprised to learn about earth-lime mortars because I have used this mix recently for a plaster base coat. I mixed hydrated lime with a commercial loam plaster and two things I noted: 1. the material smelled much nicer 2. it spread on the wall like butter And therein lies the key indeed: to spread this material was an absolute joy. The work-ability was so much better. The mortar dried and set after a week or so and it was perfect. Strong, flexible and quite able to deal with water. This test was a succes and your research just confirmed that I was on the right track with this. When it comes to lime putty as a finish plaster (top coat). I recently used soft sand 3 parts to 1 part lime putty. Of course this did not work. It did not spread well; it was a bloody nightmare. My next test will be very fine quartz sand mixed with lime putty to a 1:1 ratio like you suggested! I'm very curious to see how it it's going to react to the earth/lime base coat. This is literally one of the best and most important presentations I've ever seen in my life and I can't thank you enough!

Just completed a lovely 1:5 earth lime for setting fence post underground

So essentially, using nhl 5 is putting cement(albeit a tiny amount) back into the wall.....?

Goggles and gloves!

Thank you. We need more people like Nigel to save our world. What an amazing man. All the best.

3:40 (stupid question...) How is it possible to make any difference between putty based mortar, a fresh hot mixed mortar and "old" hot mixed mortar ? Especially after two hundred years. (by old I mean used after a certain delay) The quicklime was the same, no ?

'hygroscopic flow to a drying front"?

In America 🇺🇸 where can this type of lime be purchased? Can quickrete and this lime be used? This is very interesting.

Why put a wet trowel into the lime bag?

Turns out, this is pretty much how the Romans mixed their concrete and it has lasted thousands of years.

This is definitely better than watching paint dry. Big thumbs up!

This should have 10 million views. And workers, we should be dragging material manufacturers and architects to the guillotine.

Boys own stuff. Absolute boy, Nigel.

Nigel: I have this to say about using hydrated lime to make putty for mortar works…. There’s excellent quality control at the factory, not in material handling and storing by vendors. If it air slaked on the shelf it’s dead on arrival. Much like nhl it’s too hard to control. This is Midwest USA.

Do you think there are any scenarios to which nhls are good to use? How about internal plastering? Or do you think that hydrated is best for these scenarios as well?

question: soundless why?

Brilliant presentation, I got a video out called " lime mortar or portland" Mike haduck, and I get a lot of controversy on it but they don't live where I live and I got 50 years experience, I am going to recommend your presentation on my next next stone repointing video, thanks Mike

Hi Nigel what buckets do you use? The first small batch mix I did in front of the customer ended in disaster as it literally melted the gorilla tub😅

Good to see you back Nigel. As always, very informative and interesting presentation.

A picture tells a 1000 words, simple. Thank you

Thanks Nigel for posting these videos. I'm doing a hot mix mortar for stone foundation in Montana