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  • I need to remove and re grout the terrace. I have a grinder but am considering getting a osculating multi tool and tool for it. Has anyone done this job? Grout is concrete about 1cm wide.


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  • Just get a hammer and a masonry chisel. Relaying the whole thing is madness.

  • I guess you've already covered this, but probably a good idea to figure out what caused the cracking. Just in case you spend aged regrouting and then it cracks again.

  • I did this job on a small bathroom with a Fein multitool (original and still the best!). Went through a few tungsten carbide coated grout grinding specific bits. It's slow going and painful but safer than a diamond grinding disk. With the amount you have to do I would consider a diamond grinding disk on an angle grinder and very steady hand though. Way more risky but much quicker.

    This is the kind of disk I used :-

    https://www.amazon.co.uk/63502125210-Segmented-Tungsten-Carbide-Colour/dp/B019A32UPU/ref=asc_df_B019A32UPU/?tag=googshopuk-21&linkCode=df0&hvadid=256433357675&hvpos=&hvnetw=g&hvrand=3732394181502132717&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1006836&hvtargid=pla-332656894948&th=1

  • i did this for my roof terrace. I got a bolster chisel and a club hammer and chipped out all the failing grout by hand. It took several hours over the course of a week, in the morning, before the sun hit it. In places it was so bad that I could scrape the old grout out without needing the hammer. A stiff brush also worked sometimes. Then I mixed small batches of concrete in a 3:1 ratio, and regrouted the gaps. Again, over a few days, and in the morning. Then we painted it with roof paint.

    I didn't go the power tool route because a) it's a badly built roof terrace - after the tiles is the waterproof membrane, and I didn't want to damage that, and, b) one slip and i'd have damaged the tiles, and I didn't want to have to replace them.

    Consider using a jetwash to lift the grout and the mastic as well. Jetwashing the terrace was when we noticed all the grout coming out from between the roof tiles. Again, I didn't want to stress the waterproof membrane so i didn't go this route.

    Drop me a line if you want to discuss further.

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