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Cheers.
Annoyingly from reading it sounds like you want a SLC designed for the right depth. Cleaning has uncovered a massive fucking hole.
Am I over-thinking this, or will it matter?
hugo7-
Am I over-thinking this
Probably. The deeper sections just take a bit longer to go off, from my very limited experience. I imagine it would be more critical on surfaces that will be walked on or have underfloor heating or need to meet regs or some shit. If it were me, I'd just whack some down with a form and see what happens.
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If you were bolting down an expensive piece of machinery, it would matter.
As long as this hole is not under one of the feet, proceed.
As mentioned above, it will just take longer to cure.
stevo_com
mespilus
The amount self levelling self levels, depends on how you mix it up. I used it to rebuild the hearth in the living room. It was very easy to use. I did make it slightly looser, which meant it found every minute gap there was so there's probably a few litres under the floor. If you make a frame and cauly the seams you'd be fine. Or use plastic sheet as has been said.