The Flex actually had a swing gate you could fold away, allowing access all the way to the wall. Then I had to remove the handle to reach under the radiator.
After vacuuming and washing the floor, it turned out Sunday evening that there was still some left, so it was time to tackle it again. Most of it is now gone, probably enough to lay the floor (I'm quite picky and really want everything removed). What I've noticed is that there are white spots on the slab, which I initially thought were glue, but the glue is brown. My guess is that it's some type of putty they used to level the floor before laying the carpet.
Now I just need to determine if I need to putty the floor, the Flex did dig down a few mm in a couple of spots, I'd guess at worst it's 5 mm in one place. The glue had sunk deeper into the slab in some spots, which required more sanding.
After vacuuming and washing the floor, it turned out Sunday evening that there was still some left, so it was time to tackle it again. Most of it is now gone, probably enough to lay the floor (I'm quite picky and really want everything removed). What I've noticed is that there are white spots on the slab, which I initially thought were glue, but the glue is brown. My guess is that it's some type of putty they used to level the floor before laying the carpet.
Now I just need to determine if I need to putty the floor, the Flex did dig down a few mm in a couple of spots, I'd guess at worst it's 5 mm in one place. The glue had sunk deeper into the slab in some spots, which required more sanding.
Now I have some pictures, this is how it looks: http://imgur.com/a/a7BZm (The images can be enlarged by clicking on them)
As you can see, there is still some glue here and there, but it's probably not more than you can scrape off a bit with a chisel. The question is more whether you need to fill the floor considering the unevenness? In some places, you can see it's more uneven, and that's where I've had to sand the most. However, these are few places, the slab is mainly very nicely sanded and could almost be finished there if you don't want tiles.
As you can see, there is still some glue here and there, but it's probably not more than you can scrape off a bit with a chisel. The question is more whether you need to fill the floor considering the unevenness? In some places, you can see it's more uneven, and that's where I've had to sand the most. However, these are few places, the slab is mainly very nicely sanded and could almost be finished there if you don't want tiles.
Small marks from the sander do not need to be filled as long as you don't have long dips or ridges, it will be fine.
After there was glue left on the floor after a couple of washes, I have now tried to scrape it off myself. Unfortunately, it was very difficult with both a wire brush (on a drill) and a chisel, so eventually, I took out the hammer drill, set it to just hammer, and used a chisel on it. This was much more effective, but I also noticed that the floor is probably leveled with some softer material. It's white instead of brown like the glue, and in some places, it's quite soft, almost like rubber, but primarily it seems to be porous and quite sensitive. There were some small holes in the floor, but nothing that can't be filled with fix.
All the glue is still not gone, but now I think most craftsmen would be satisfied. It's probably that leveling material they used, I have no idea what it is. If you want to remove it, you have to go DEEP into the concrete, maybe 1 cm or more in some places.
All the glue is still not gone, but now I think most craftsmen would be satisfied. It's probably that leveling material they used, I have no idea what it is. If you want to remove it, you have to go DEEP into the concrete, maybe 1 cm or more in some places.