Leveling the underfloor
You might discover your underfloor where blocks have been removed is rather uneven. Or the removing the Bitumen has damaged the concrete or sheet material. You can use acrylic leveling compound to level a concrete floor out as best as possible – 3mm maximum per coat. Always read the instructions carefully before you begin with this type of job! And even though it is non-water based, allow sufficient time for the compound to dry before you start installing the wood blocks back.
For uneven sheet material you can try to level it out with a hand sander or nailing/stapling thin sheets of hardboard onto it – smooth side down!
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