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Hi this is Carl the landscape guy. In this video I will show you how we complete cement-bonded grouting of natural stone slabs. This chapel forecourt is being redesigned. The natural stone slabs laid in sand have sagged over the years, forming trip hazard joints. The plates will be re-installed later, so they will be picked up, cleaned and stored off to the side. The dirt is excavated out to the planned size and a base layer of mineral crushed stone is prepared and compacted. Then we set the frame stones. On the gravel surface, the sandstone slabs are now placed in a layer of permeable concrete. An adhesion compound is applied to the underside of the sandstone slabs. The entire chapel forecourt is laid this way. Meanwhile, the work for the sandstone wall has started. The wall will frame the little forecourt at one side as a retaining wall. You will find a detailed video about natural stone masonry on my channel, I’ll also link it at the end of this video. Okay that was it for the preparatory work, because this video is specifically about how to grout natural stone slabs. Before grouting the slabs are watered well. Moisturizing is very important, even more when it is hot out, so that the natural stone does not draw moisture from the fresh grout filling later on. For mixing, we fill a bucket with water. The mixing ratio is 5 L of water per 25 kg of cement. If the mixing ratio is wrong, color differences may occur after hardening. Therefore, always try to use the same mixing ratio for the entire area. For very narrow joints, the mixture can be a little thinner, so add more water. These are joint widths of about 1-3 inches. With these wider joints, the material can be mixed with a little less water, making it a little thicker. Mixing is best done with an electric mixer. Some mortars have coarser proportions of material, so make sure you have the right mixing tip. I would recommend one that is open at the bottom for easier and quicker whisking. We slowly add more water until the mixture is right. As soon as the dark filler material begins to deposit black streaks on the surface, it has enough water. Here we use the Marbos PFM – ZE melan in 25kg bags. The mixed batch should then be applied promptly onto the slabs. Since the mortar starts to thicken immediately, we start to work it into the joints right away. The joints are to be well-filled and the excess material is to be pulled off. The quicker the excess material is removed, the less it needs to be washed off later. The outer edge of the slabs joints should be sealed up before grouting, so that no grout can seep out the sides. If the mortar becomes too thick, it can be slightly rewetted with some water. While one employee distributes the grout, a second guy should mix the material so that there are as few breaks as possible during grouting. The mortar must now be washed from the surface of the natural stone slabs before it sets too much. But wait until the new grout is slightly hardened. There are two methods for cleaning the slabs that we would suggest. For the first one, it is smart to lay out a wooden board to protect the new grouts. For washing, a professional wash box should be used and filled with clean water. Then the natural stone surface is washed with a sponge board. First, a surface section is washed with circular movements. This loosens the mortar from the surface and smaller groves. Then wash out the sponge board before wiping the surface clean. It is important to always pull in one direction and put the sponge board down on its entire surface. As soon as mortar streaks are visible, the sponge board should be washed out again. Also, depending on the size of the area, the water in your box should be changed every now and then. With this method you can work your way out of the corner. For surfaces with a higher proportion of joints, it’s possible to easily pull out the joint with the sponge. Try to pull across or diagonally and not along the joint. For deeper spots a regular cleaning sponge can be used, but this is not suitable for washing larger surfaces. The second option is to wash the surface by spraying it with a fan spray nozzle. This method speeds up the process, but requires more attention and practice. With the nozzle, the excess material is sprayed off the surface. The intensity of the beam can be varied by the distance. The jet of this Gardena nozzle is very appropriate for this.
#grouting #flagstone #diybuild


  1. Gary Lam on November 21, 2022 at 9:34 pm

    This is so helpful ,been around this work my whole life .
    However being an electrician never paid much attention,to busy doing my work .
    Now my daughter is in desperate need of some patio stone needing something besides gritty stone .
    Wish I had paid more attention when I was younger .
    Almost 70 and never attempted a finished outdoor patio stone refinishing .
    With this video I am fairly confident that
    I can pull this off .
    Thanks so much
    Very Helpful

  2. Jon Morrison on November 21, 2022 at 9:34 pm

    Not bad 👌 idk if it was intentional, but you guys did a great job of mimicking the jointing in the flagstone with the the stone work around it.

  3. Efren Troncoso on November 21, 2022 at 9:38 pm

    These people don’t understand how to install stone masonry that will last. Stone masonry is a dying art form and craft.

  4. cats gaming 4 on November 21, 2022 at 9:40 pm

    I got a question about my atmosphere in my country and how to make it possible to do it myself, I live in Iceland and it’s cold 🥶 in vintner times, and I want to make sure that it will never move in the frost .
    Maybe I should have concrete underneath and thicker layers of cement with layers of iron to strange it to be solid 🤔?

  5. Mountain Mike on November 21, 2022 at 9:43 pm

    Do you think this method would work for a brick patio with cracked mortor joints. I am not worried about smears on the brick. I do want it to seal the joints. Thanks for the video!

  6. James on November 21, 2022 at 9:45 pm

    Best way get a grout bag and squeeze in the joints finish with tuck and strike$

  7. Sterian Alina Nicoleta on November 21, 2022 at 9:46 pm


  8. GiegX on November 21, 2022 at 9:46 pm

    Well, now you should explain to everyone why this WET method is better than grouting with dry material and after moisturing it. Thanks 🙂

  9. Sean Daly on November 21, 2022 at 9:48 pm

    Wow great video very informative

  10. Josh Dunn on November 21, 2022 at 9:52 pm

    Where did you get your sponge board

  11. zerovalue on November 21, 2022 at 9:56 pm

    Great work! Looks amazing and this video makes me want to do a landscaping project.

  12. David Mc Intosh on November 21, 2022 at 9:57 pm

    Some person‘s comment that you’re not doing a good job and you’re not showing certain things I’m sure that person can’t do any better
    Fantastic job come to my house I have a small place in the backyard I want you to put a small rock wall it looks beautiful totally spectacular work guys!!

  13. Andrew Froude on November 21, 2022 at 9:57 pm

    Great job. Well done and thank you for sharing.

  14. Andriyah Ben Ysrayl on November 21, 2022 at 9:57 pm

    Excellent Video Carl job well done thanks for sharing

  15. Jamie on November 21, 2022 at 9:58 pm

    You lost me when you started speaking in metric. Us Americans are a little bit behind everybody else with our measurements. But we lay stone pretty much the same way here.

  16. The CWB Club on November 21, 2022 at 9:58 pm

    Why not lay the flagstone on a slab and in a mortar bed? Also we grout all by hand. Pouring cement in seems to make a huge mess sometimes and takes longer verses just doing it by hand. ( taking 2 1/2 sand to 1 cement. ) we do it all by trowel and custom made “putters”. We take brick pointers and round them. Then just push the mud in making sure its packed in really good. This is a method thats been used for over 100 years in South Eastern United States.

  17. Paul Galbraith on November 21, 2022 at 9:59 pm

    I don’t know, it looks nice, but something about it looks off.

  18. NJ201 Duran on November 21, 2022 at 10:00 pm

    What kind of grout did you use? Would regular mortar mix work?

  19. El Racó del Bosc on November 21, 2022 at 10:00 pm

    Good job, We at El Racó del Bosc (Barcelona) are rebuilding dry stone walls, huts and canals, some of which are over 1000 years old.

  20. Sandi Newton on November 21, 2022 at 10:01 pm

    Wow, that’s a lot of work and these workers seem dedicated to doing a really good, thorough job.

  21. Lars Linebarger on November 21, 2022 at 10:01 pm

    Jesus you never use a grout bag huh? Sure is easier than floating the mortar over f-in everything and having to clean it off. What a mess

  22. Heart of a Lion on November 21, 2022 at 10:03 pm

    Good job 👏

  23. Stephen on November 21, 2022 at 10:04 pm

    I noticed the same cigarette butt in every shot.

  24. House Fairy on November 21, 2022 at 10:05 pm

    I learnt something from that…thank you!

  25. Bill Wilson on November 21, 2022 at 10:05 pm

    That will be beautiful for as long as it stands. no one will ever want to change the look.

  26. Kim passey on November 21, 2022 at 10:08 pm

    This project doesn’t last but two years prove me wrong!!!

  27. 666 on November 21, 2022 at 10:09 pm

    I’m not gonna lie, I shit my pants when that mortar was dumped on the stones. But obviously I was unaware of how this was done, and I must say it was a swell job. Well done!

  28. OldManRik on November 21, 2022 at 10:09 pm

    first I’ve heard pouring 100% concrete over pavers and washing off with a sponge

  29. BrulicYTFamily on November 21, 2022 at 10:09 pm

    Every hour, all the praises. You can watch it on my YouTube channel.
    How to install natural crushed stone…

  30. Marc Marc on November 21, 2022 at 10:09 pm

    But how to clean flag stone slate

  31. Moose knuckle on November 21, 2022 at 10:10 pm

    What kind of grout

  32. Havran-E on November 21, 2022 at 10:11 pm

    I know how to remove uneven seams between stones. Made a video recently. Come to me

  33. Bob Cranberries on November 21, 2022 at 10:11 pm

    What kind of grout are we talking about? The same as tile grout?

  34. Tony Action on November 21, 2022 at 10:15 pm

    Great job!!!!🤙🏼💪🏼

  35. Insert Name Here on November 21, 2022 at 10:17 pm

    That is definitely not america. Americans lost this skill many moons ago

  36. Mountain Mike on November 21, 2022 at 10:17 pm

    Great video, where could I buy this product? eastern USA. Thank you!

  37. de k on November 21, 2022 at 10:18 pm

    WOW – that’s a lot of work!!! Beautiful results – thank you.

  38. Private Uploads- Geo on November 21, 2022 at 10:19 pm

    Is the permeable concrete dry or wet when you lay it out and level it? Are you laying it out as you go? How thick is it? It looks like you lay it out wet, level it as you go, and then it somewhat dries before you lay the flagstones on top of it?

  39. alex Fitz on November 21, 2022 at 10:20 pm

    Thats looks beauty

  40. Raising Global Kids - AskTetsu on November 21, 2022 at 10:21 pm

    This was a great video! Learned so much. I’ve read elsewhere to make grout with 2 parts cement, 9 parts sand, and 1 part hydrated lime. Is this similar to what is used in this video?

  41. Inventor, Writer, Ace Editor on November 21, 2022 at 10:22 pm

    A lot of work. What is the grout material you are poring all over. Is it just Portland cement with no sand ? I have a flagstone room indoors. I read that to much water weakens just Portland cement. I want super smooth grout lines so the mix is important. I do not want to spread it out all over my floor. I will take my time and apply with a tube right into the joints and that will require minimum cleanup. I may even try using painters tape eliminated any mess.

  42. Comfortably numb on November 21, 2022 at 10:23 pm

    To light

  43. agt155 on November 21, 2022 at 10:24 pm

    Probably would’ve been easier grouting by hand.

  44. Tom Napper on November 21, 2022 at 10:24 pm

    Old stone mason over 40 yeah expensive retired now l you got 3 men there you could pont it by hand been much clean job 👍 I have use a product call flow pointing you do same thing squeegee in but leave it 15 to 20 starts to set give a light jet wash not keen on it all founds the joints would sync a little bit . Pont by hand all way best way 👍 even on to own way of doing it but laying of the sandstone look really good and the wall you built 👍

  45. metubeross on November 21, 2022 at 10:25 pm

    Great video! I unfortunately started to grout a small area without seeing this and I have cement streaming and globbed atop some of the stones. How can I remove the dried excess cement? Is there a chemical I should buy?

  46. Saeed on November 21, 2022 at 10:27 pm

    Sponge method is a pain. Good job

  47. AMM0beatz on November 21, 2022 at 10:29 pm

    1:11 😳

  48. Jack Davis on November 21, 2022 at 10:30 pm

    What’s the benefit of working this way instead of packing the joints with dry mortar, brushing and then wetting it afterwards? I’ve seen both methods used, but I can’t see which is better

  49. E Olden on November 21, 2022 at 10:30 pm

    Always make a huge mess first then try to clean it up.

  50. Havran-E on November 21, 2022 at 10:31 pm

    Like 👍

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