Hi, I have covered a concrete floor with an unused floor drain with laminate flooring (foam mat underneath) and of course, the floor is not even. I have tried various materials as underlay to even out the floor, but it is really difficult to get it completely even.

How do you solve this problem?
Now that I'm going to install the baseboards, I notice the unevenness + when walking over the floor drain, the floor still bends.

How do you fix this properly? Without cement or other liquid solutions. The drain should remain untouched.
The slope towards the drain is about 70cm in diameter in all directions, which makes it really difficult.

Does anyone have a solution?

What I have already tried:

Felt paper
Masonite
Click Flooring Underlay
OSB

In different patterns and different thicknesses.

Diagram showing uneven laminate flooring over a concrete slab with a floor drain beneath, illustrating challenges in leveling the surface.
 
JanneJanne123
Tape the well securely and apply fine sand, as was often done in the past to level the entire concrete floor.
 
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Anonymiserad 170696 and 1 other
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JanneJanne123 JanneJanne123 said:
Tape the drain properly and apply fine sand, that's what people often did before to even out entire concrete floors.
Sand sounds smart. Like sandbox sand?
 
JanneJanne123
Yes, it works excellently.
 
So tape over the well properly, then just pour sand and flatten until it is compressed, and on top of that the floor mat and then the laminate flooring? Won't the sand be pushed aside and unevenness still occur?
 
Farstatjej90
How big is it? Can't you just lay down some lighter reinforcement and then just fill it up with concrete?
 
JanneJanne123
H Hamstraren said:
So tape over the well properly then just pour sand and flatten it until it's compressed and on top of that the floor mat then the laminate floor? Won't the sand be pressed aside and unevenness occur anyway?
As long as the sand has nowhere to go, it will stay in place. My entire previous floor was leveled on sand, it was very firm and nice to walk on.
 
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Hamstraren
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Reinforcement is completely unnecessary, but just sand as suggested is definitely the simplest - especially since the original poster doesn't want to remove the well. The sand doesn't shift.

However, I would be a bit worried about odor, when the tape ages a few years and might start to peel.
 
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Hamstraren
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Thanks, I'll try with sand.
 
Buy a real green tape that is age-resistant. Do 2 layers of it so then just fill it with completely dry sand and not directly from the playground 😜
 
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Hamstraren and 1 other
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I filled with sand and laid the floor. It wasn't 100% perfect, but it was much better than before. Thanks for the tips.
 
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