Complete guide to mixing lime mortar
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- čas přidán 21. 08. 2024
- Roundtower Lime are a supplier of premium lime products to the conservation and eco build construction sectors.
The following video shows the mixing process of Roundtower NHL lime. This specific mix has been done with Roundtower NHL 3.5grey.
If you have any questions please leave a comment and we will get back to you.
Very clear and easy to follow I've watched 50 youtubes on mixing and got nothing, got it all on this one, thank you.
I am delighted that we could help you. Thank you.
peace out Agree
Great video, thank you
Good job, indispensable visuals, couldn’t be any more clear. I feel that I could go out and accurately mix a batch ...
i wish these tutorials educated more about the actual types of lime. like what hydraulic lime is for and when to use hydrated lime
Great information clearly presented. Thank you very much.
I’m just about to repoint an exterior sandstone wall. Thanks for such clear guidance on the mix process. One question... Roughly, how long will a mix remain usable?
put across in detail, done a step by step patient presentations using very simple and clear words while providing information. very helpful .Request if one can show application of mix prepared it feels complete.
Thank you very much for those kind words. This mix was was on a pointing video which is also on our CZcams page. We hope to do a plastering video in the near future.
If you put two half bricks in to the mixer it helps to get air into the mix making it smoother.
Thank you very much.🇦🇺
Been looking at lime mixes for a binder material, Sadly the NHL is excessive cost in the west coast area of the US. I've been looking hydrated lime with a Pozzolan additive to have a similar result that is affordable. Hopefully NHLs will become available locally to make them more attainable in the future.
i use for my job brighton cement hydrated lime thats australian and i am australian we use lime for straw bales and patch up work but this lime looks good.
Thank you for this video! I feel that Ive been tugged and pulled into different directions on what to use in the U.S. as many state to add cement or buy a mix with cement.
I have a 1901 Queen Anne with a Rock foundation that needs a lot of help before it bows as there are gap openings from the old mortar that has crumbled into a white powder onto the floor.
I hope I can find what I need as I've also read that I need a certain type of sand, Sharp, I believe it was called.
I'll go and take some photos of the foundation and place them on mh google drive so you can see what it looks like.
This video is of great value and appreciation! Thank you!
Thank you for your lovely message. If you drop me an email on harry@lochplace.com, I will help you out as much as possible.
Here is the link to the images. I'll get an email sent as soon as I get the time tomorrow. Thank you!
(Just imagine and entire basement like this and not just these small image areas)
drive.google.com/folderview?id=15--g6ahGXhYzczVAzJKwJK6ZXoxJl4Kt
@@roundtowerlimes9863 thanks for the nice video can you please help on the mix of lime cement and sand for platering adobe house in africa
@@justiceforall2393 Hello, Can you send me an email to harry@lochplace.com please.
Thanks for the video, what kind of sand is needed for this mix? thanks
I had a stone retaining wall, 4 ft. high, built about 5 years ago. Along the top of the wall, they put flat stone, believe it is slate, about 1 inch thick. In any case, many of the flat stones across the top have come off. What would I use to cement or glue them down, so they don’t come off again? Should I remove and replace the old mortar, or just add new mortar (or glue) on top of the old? Thank you very much!
Good tutorial. I think I'd get fired 3 times a day if I took that long to mix a batch though.
We were trying to do things slowly and make sure people got an idea of exactly what we were doing. It could be done quicker, should you be in a rush.
Would you need to add more water for an external render application? Could you use 3:1 Sand : Lime ratio for external render? For small jobs can you use the drill type paddle mixers? Thanks in advance on any response.
Great video. That last bit of water has seen me ruin many a mix..🙈
so if you want to mix another mixerfull you have to dry out the mixer that wouldnt be great
Can you mix it with building sand instead of the sharp sand ?
Nice explanation. I see some videos builders using sand and lime and some using cement and sand. Whats the difference,? Also if youre gonna plaster thick internal walls thën would you use sand and cement or lime and cement?, or does not really matter'? Just abit confused
What matters is that the mortar should be a little weaker than the material it is being applied to. Cement is the strongest and is only for modern buildings. The problem with using cement on Victorian and older building is it can't flex with movement in the wall so it just cracks. Worse still, it does not let water vapor out of the wall so it causes damp problems, whereas lime mortar is breathable, allowing the wall to dry. Also, lime can self-heal to some extent. Natural hydraulic lime (NHL) comes in different strengths. Non-hydraulic lime (putty) is the weakest but most flexible and breathable so it is suited for earth and cob construction, for example. In other words, if the building was constructed before Portland cement was invented, then stay well away from cement as it will just fail and cause damage. Just my 2 pennies.
Nice video buddy, I'm about to start indoor lime rendering, the video has helped a lot..
would you happen to know how many grams of horses hair you would add to your 1 lime to 2.5 sand mix, for a scratch coat
great vid, would you add sharp sand, if so in what ratio :)
Cheers and thanks
I have heard that one can add ground up charcoal to darken the colour? Do you have any thoughts? Thanks.
Do you just use grit sand/sharp sand, not mix sharpsand with building or yellow sand?
Good info but you must remember to add some of the water FIRST, in order to keep the mixer wet, which prevents sticking and reduces dust.
I would put water in first.
I find pissing in it first helps sticking
@@mikede2331 Dirty little habit you have there; but we don't want the sticking, do we, mike de!
@@johnsomerset1510 ;)
Is there a difference between using hydraulic lime and hydrated lime ? ... i have a wall with a small area of rising damp... it is an old limestone wall and was rendered with cement mix (and to make it worse it was finished with a rubberized top finish) ... i have cut out the bottom part of the render where there is rising damp and would like to render with a lime render mix to allow it to breathe .... unfortunately in malta where i live bags of lime are just transparent bags with no markings on them so i habe no idea if its hydrated or hydraulic lime ... can i use both for lime rendering? Thanks
Hello Darryl, hydrated lime and natural hydraulic lime (NHL) are not the same. NHL is a binder, and when mixed with sand/water creates a mortar. Hydrated lime is used as a plasticiser in cement mixes. Ideally you would be looking for a NHL or lime putty. I would also be cautious with rising damp. There is no such thing really... Is there moisture coming into building any other way? Are all your gutters, downpipes etc in good looking condition? It is working increasing drainage on the outside. Is the exterior ground level higher than the interior? A drain around the outside of the house may help the problem.
You can always add water but you can’t take it away 👍
Very true!
I thought you had to soak (slake) the lime in water for at least a week first before using What am I getting confused about?
Hi. Traditionally when working with lime the lime binder was mixed with the aggregate (sand /gravel) and left to sour out for a period of time. There were what was called non hydraulic limes.
On this demonstration we were showing how to mix a Roundtower natural hydraulic 3.5 lime. Generally hydraulic limes are mixed and used immediately. I hope this helps clear up any confusion.
Powdered lime is safe to work with.
Hi thanks for your vedio is this shap sand or builder sand ?
Washed sharp sand.
@@roundtowerlimes9863hi ,,is it possible to use building sand to get a smoother finish for pointing ?
Great video and greetings from county meath 😊
Just 2.5 of builders sand, not any grit or granite flakes?
Or would you substitute .5 sand for grit or granite chips?
Can I use that mix for flooring?
I like to think of him just staring into the mixer for that 10 minute mix.
Please upload lime construction videos
how do you get the bice beige / yellow lime mortar though
I’ve only one question, that sand you are using, is it building sand? or sharp sand?
It looks like sharp.
Im going with sharp. Got that gritty sound.
Always sharp (grit sand) with NHL. I sometimes add 1 part soft sand to make it more manageable.
Thank you very much for this video.
For a smooth internal finish coat can you use 1 part lime to 1 part sand, or 1 part lime to 1 and a half parts sand.
Thanks. Regards.
Hello, You can use 1 part sand but it would need to be fine silica sand mixed with 1 part Roundtower NHL 2. If you would like any assistance please do give us a call on +353 21 477 6677. Thanks
@@roundtowerlimes9863 Ok, thank you very much for the information. Much appreciated. Kind Regards.
@@roundtowerlimes9863 What is the difference in practise between nhl 2/3.3/5 in plastering etc?
What's your mix for the finish coat lime render?
what type of sand is used here?
Can we use slaked lime also. Please help it will be helpful for us.
You don't put the water in first, like with cement ?
Hi thanks for your great videocan you please tell me whic nhl is good for internal wall plastering?
Hello, we would usually recommend Roundtower NHL 2 for internal works. It is worth having a read on the technical section of our website for more info, www.roundtowerlime.com/applications/internal-plastering
Would a more accurate way, for the quantities if you have time, would be to weigh the sand and lime mortar? Eg mix 3:1 use 30kg sharp sand 10kg lime ?
Sand weight will vary dependant on water content. Measuring by volume is more consistent than by weight.
What ratio would you use for structural walls?
The lime u are using is caco3 (pre heated n cooled )?????
Why not use NHL 2 , 3.5 seems a bit strong for most applications
Hello, This was just a sample mix.
Good stuff.
Peace of Lord Jesus upon you and yours
Thank you very much.
how does this set with no cement
The lime sets it off slowly
would you use that mix for laying old bricks and reclaimed old stone as well?
This mix would be perfect. It is made up of 2.5 parts sand and 1 part Roundtower Natural Hydraulic Lime (3.5).
@@roundtowerlimes9863 interesting, I do have to lay few courses in order to fix my front garden wall in front of my house and want use lime mortar as it was originally done. Therefore, I know in this condition mortar is good for pointing but for laying “bedding” bricks it looks to be in quite semi dry condition. Would it be advisable to add more water to make the mortar more workable and pliable? Would appreciate your advise. Thanks.
I tried quite a stiff mix with 3-/1 using sharp sand and it takes a mallet to knock the bricks down. I make it quite sloppy cement so the consistency is more like cement mortar. Had quite good results this way, just needs a gentle push or trowel tap to knock down
what sand? Looks like sharp not soft/building.
In a mixer you should put some water first to avoid sticking!
I thought that lime mortar mixing should occur in a flat puddle
Why not put some water into the mixer first, this will generally stop the mix sticking to the back of the mixer, On small mixers there's no wheel to change the angle of the drum. Unfortunately cleaning the back of the mixer while it's full is inadvisable from a healthy and saftey point of view. Switched off or not.
Lime need to be mixed dry first and left for a while...
How would you mix a fine dry powdered lime.
For some reason, he reminds me of theon greyjoy's seafaring uncle.
Hahaha!! Spot on there.
I thought lime needs to be slaked?
Sharp sand?
No cement ? 🤔
While I like the Irish accent in English, it always reminds me of the sad state of the Irish language.
In aust we only have hydrated lime is this the same as hydrolic lime
Hydraulic lime and Hydrated lime are completely different. Hydrated lime is used in cement mixes to make the mix for workable. Hydraulic lime is available from HSR group in South Adelaide.
What the sand mix? 🙄
How much water about?
Hi Katie, the amount of water added is determined by many factors such as, how wet the sand is, what job the mortar is going to be used for e.g Pointing or Rendering etc. If you would like some technical advice please give us a call 021 477 6677 or 0044 1737 245554.
What sand is that ? And why you not wearing a mask ??
That mixer is causing me stress
I saw that and suddenly felt like my 3 year old mixer is in great shape haha
Why don't you slake the lime in the mixer first.
On this demo we were using Roundtower Natural Hydraulic Lime.
You slake quicklime (raw pellets of bunt limestone. Bagged lime has already been slaked you are just rehydrating. A lot of purists use hotlime by mixing sand and quicklime with sand and slake on site.
Alexander Muir no way
where's the whiskey?
Calm down calm down……🤣🤣🤣🤣🤣🤣🤣