Sticking small parquet blocks back down

[ray.birch]

Good evening all. Per some other threads, I am currently knee deep in trying to restore a 1950s parquet floor that has been hidden and unloved.

Mostly sanded now, but there are a few blocks that are loose (to the point they could be teased out gently with the hoover).

My question is whether there is anything specific I should (or shouldn’t!!) be sticking them back down with please?. One block further away had clear signs of bitumen/asphalt, but I’m not sure if that’s what I’m seeing here? There seems to be some sort of foil layer (albeit perforated). My first thought was a few blobs of CT1, but I have nightmares of something reacting with bitumen further down and ending up with a big black mess in the centre of the floor!!

Many thanks as always for the guidance here!!

 

[opps]

AFAIK, CT1 should hold it down, but I would expect it to allow a small degree of movement.

A "mate" deals with parquet. He told me that, when sanding, the machines are so heavy that they might dislodge loose sections. He went on to say that the cost of removing the old bitumen is prohibitively expensive.

Try CT1, see how you get on, and then let us know..

edit-----It is not solvent based, so it should hold the blocks down over the bitumen. That said, I would not expect it to be rigid enough to sand the staves.

 

[ray.birch]

Amazing - thank you @opps for the super quick reply!! Having checked my stocks, the only CT1 I currently have is in white - whilst not expecting this to be visible, I may swap for some exterior silicone I also need to open and use for some other jobs if that seems ok? (It does say ok to use on bitumen)! Is there any significant difference between “sealant” and “adhesive” - noting that CT1 says both whilst the Wickes sealant doesn’t (at least not that I can see!).

 

[opps]

The wickes stuff should be fine, like CT1, it is a MS polymer.