Clean blocks and underfloor
Old parquet floors normally were fixed down with Bitumen – black tar - an ‘adhesive’ no longer allowed to be used inside the house. Any residue of bitumen has to come off as best as possible.
The underfloor (concrete or sheet material) must also be cleared of old ridges of Bitumen and if possible thick remaining layers.
Any residue of Bitumen will affect the bonding time of the modern adhesive you use to install the blocks back. Where normally it takes between 6 – 8 hours, the residue could increase this to 14 or even over 48 hours!
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