Self levelling floor timelapse | Failed and Rectified | Mapei 3240

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This is our first time attempting self-leveling over a concrete screed slab.
The process involving floor cleaning, building bunds and rails, priming, pouring self-leveling compound. We devided the open-plan floor into 3 main parts to level.
1st Part - kitchen (failed): 7 packs of Mapei 3240
1st Part - kitchen (rectified): 4 packs of Mapei 1210
2nd Part - living: 6 packs of Mapei 3240
3rd Part - living: 4 packs of Mapei 3240
It was quite a thick layer - 21 packs of 25kg in total, as the floor was 30mm out of level over 30m2. We used laser levels to check high points and low points. During pouring compound, we used an aluminium straight edge to spread the compound (we failed the first time without this, we found that this self level compound does not automatically find its level). I used Mapei Ultraplan 3240 self levelling compound and 1210 to rectify the first failed attempt.
In preparation of this, we have watched a lot of useful youtube videos for a good technique to level floor. It was back-breaking hard work, failed at the first attempt, but managed to rectify it and achieved a flat and level floor throughout.
Thanks for watching!