I am finishing a basement roughly 900 sqft. The concrete slab for the most part is level, however, it does have some imperfections at some 18-20 high points (1/8" or less) and a couple of low areas. One low spot probably needs some self leveling concrete for a 1/4" dip. We are planning on installing laminate on this basement floor.
Options (Please see updated questions in the update section below):
- Install a thicker underlayment to absorb the high spots (if that's even possible)
- Pour self leveling concrete to correct the high/low spots?
- Grind the high spots down and maybe correct the bad dip?
Update:
Here's a better picture of my basement (aka the dungeon):
The red spots are the humps, anywhere around 1/8" – 1/4". Green are dip areas.
Thanks all for the comments. It's been a busy summer with kids activities and I found sometime and made an attempt at option #3 with a Bosch 1773AK 5-Inch Concrete Surfacing Grinder.
I spent 6-7 hours in the dungeon trying to grind these damn humps down and after all the dust cleared, I don't think that I really made that much of a difference and set off my smoke alarms (yes I had the vac attached with small particle filter) and massively sore forearms.
So here's my updated question:
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Should I attempt to rent a bigger push type concrete grinder for taking out the humps(marked red) and patch pour the low spots identified in the green above.
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Flood the basement with SLC (self level cement) and then rent a grinder to take out any residual high spots. (very expensive, but I'm looking for the best option)
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Throw in the towel and hire the pros to come in and take care of this.
Thanks so much.
Best Answer
ok guys, here's what I did. Of the highs and low spots, I found that there were a couple dips that were significant, by the door and by the stairs/bedroom. I filled both of these in with SLC (self level concrete) and the results were pretty good.
Suggestions: