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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. Without practice, however, this method can
easily flush out the new grout. You should start in a corner and work your
way out. A coworker should help with the squeegee to
remove excess water from the surface. And here is the result. The gray grout provides a nice contrast to
the slabs and transforms the chapel forecourt to a stable entrance area. Now, only the walkways and lawn need to be
done. Framed by the natural stone wall, the new
forecourt fits seamlessly into the ambience. This video was created with the kind support
of Balzer Landscaping Construction Company. I hope this video was helpful. You can find product links in the video description. Please subscribe to my channel for more videos. If you enjoyed the video write me a comment,
hit the thumb up and share the video with your friends and colleagues, thank you for
watching, until next time, I’m Carl the landscape guy.


What is you want to lay that stone over an existing concrete patio? Someone should make a video for that. Don't know if I should use thinset? what kind of prep on the concrete? any help would be appreciated.

Thought that was too much water which would make bubbles which in turn create pinholes in grout ? Seems fine great job ! 👍🏽

Why not brush in a semi dry mix that won't stain, then use the hose to spray a heavy mist over the lot to make the mix set? Surely faster. And in the 2nd method you use to clean, will the hose not also wash out the joint?

Interesting, I haven't seen grouting done like that, I always use a semi dry & squash it in tight. I like it though. Great job

So tell me how this is more durable in the long run? Is the grout hard/monolithic? Will it crack up over time?

I just stumbled on this video and I was NOT disappointed!! Fantastic narrative of the process and its' work. just Subbed!!! 😉

most impressive rock slab reboot !

that is the best and quickest way to get the job done right. . . and the use of that squeegee just made it better.

awesome video !!

2000 thumbs up !! ingenuity !

I'm a stone mason bricklayer from Australia. Was hoping I found a quicker way to grout. But no, goes back to what we do, but we hand grout on knees following by same roller bucket. We must all hate grouting from around the world haha. But we do use some cleaning vinegar in our cleaning bucket, it helps with smears.

Says mixing ratio is important… proceeds to add more water anyway "until mixture is right". If the ratio was right to begin with why add more water.

I still like the traditional sponges because I can manipulate its shape to better get in the tight spots.
I wouldn't spray that mud off at all….thats the sponge's job!

I wanted to vomit when I saw the stone just sitting on top of GRAVEL!
It will never last..

Does not work in an area that has a freezing and thawing climate. Where I live you need to lay the stones on a cement base. I have fixed patios done this way-takes a few years but having a porous bases causes it to become saturated. When the water freezes it causes the stones to heave and the grout pops loose. (It was 3 grand to repair). It is much easier to get the stones flat this way but not here in northeast America. Cement base-set stones in mortar, grout. "How to"- Have loose stones in NJ.

Would there be less waste and cleaning to do if you had a device to inject the grout directly into the joints and cracks instead?

а в нас просто засипають сухий цемент у щілини а потім просто поливають водою з шланги =)

The best way for Flagstone is a grout bag. So much cleaner and faster in my opinion. Yes to anyone I have done it. Spreading grout like this just fills in Natural looks of the stone. Just my opinion thou

I have tons of flagstone just laid on dirt in my backyard, and this is exactly what I need to do. After seeing how much labor goes into it though, I may abandon my typical DIY mentality and hire someone.

Much easier to brush the grout in dry and then wet down to cure it. Easier to apply and almost no clean up time.

I swept my dry powder grout into my stones then wet it with a light sprayer of water, still there and looks great after 15 years, and no messy wet crap to trowel around and have to clean up the stones…..

I can't believe that you aren't a native Eng speaker (it seems that you come from Germany, as per Socialblade). Well done with the accent training, I guess (?)

So that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides so that no grout can seep out the sides.

Really wanted to watch this, but can't stand back ground music. I find someone else who doesn't add annoying music. STOP ADDING MUSIC.

dude you made your job harder and longer next time you should try taking a 3 liter soda bottle leave on the top cut the bottom off so you can easy fill after all is done. then you take the top drill a hole place a water balloon inside the hole place top back on fill bottle and cut small balloon when ready to use so you can easy pour straight into the cracks

You made the mud weak by making it soupy and you made cleaning time way longer by covering the entire surface instead of just the joints. If you dont have a concrete base and are doing it this guys way; have fun redoing this every year when the ground moves. Also, the rock work looks terrible. Absolutely no consistency. A homeowner doesnt know better, but you do.

I poured dry grout, swept it into the cracks, then watered it. That way I didn't have to do extra work of the wipe'n

Wouldn't it be easier and less work just to pour it into the cracks then flatten it out to balanced.

How would this hold up in a cold climate with frost heaves during seasonal freeze/thaw cycles?

So can we build a cement walk way then add crushed stone ontop of it build edges lay the sandstone and joint pitch it in? Would that make it better and last longer since the ground wont move? Im a roofer but love landscaping so this is a real question. Instead of dirt build a deck for the stones to sit on so they never move

You guys do a very professional job. Not everyone puts the time in like that. 20 years that will still look awesome

It's always a pleasure to watch people who care about their craft make something beautiful. Those guys are a bunch of pro's.


Nice job with the walkway, I am putting in a flagstone walkway in my front yard and used quickcrete mortar mix and added pea gravel to contrast with the darker stones. I let it dry for about 2 days and was out washing it off with a hose and the mortar was flaking off. I am not sure if the pea gravel had anything to do with it, if it was just an old bag or my water mix was too diluted. The mix will just crumb in her hands like dried up dirt. When I layed it down it was still pretty thick like pancake mix. I noticed you used a grout for your project, is that usually the best to use for a slab walkway?

This is really cool. It's seems like old school knowledge still being respected and replicated. Everyone should have their own patios/walls/gardens and floors like this.

Wow you have a House from the Renaissance Era back in the 16th Century Love it…

as for the Grout how do I mix it does it just use Water I'm putting some Garden Edging Rocks together to make a Flower Bed for my Plants

BTW how can I Concrete my Yard does it matter if Grass is still Growing or do I need to Fork my Land before doing this Procedure

I really like this pavement style. Next week i'll get access to my new home with a 1660m2 backyard. Can't wait to make it a small paradise 😀

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