We received the following question through our "Ask Personal Advice on Wood" form.
1950's house renovation and new extension
We are renovating the parquet in our 1950's house. We have parquet blocks in our lounge (not T&G) that are stuck with bitumen (3 fingers per square approx 11x11cm per square). We have extended the lounge and I have reclaimed the parquet from another room and would like to lay it in the lounge extension to complete the floor. Then sand and redo the whole floor as one. The new floor will be concrete screed.
My questions are: Can I glue the blocks directly to the screed or should it be sealed or leveled out first? If so with what? The screed is pretty flat but is quite sandy/gritty. Is there a product I can use to glue the parquet which will bond even with the residual bitumen on the old parquet so I don't have to remove it? It's only a thin layer of 1-3mm? I was intending on leaving the existing floor alone as it is sound.
Primer and bitumen advice (again)
Thank you for your question. Starting with the dusty concrete floor, this needs a primer to prevent any adhesive only bonding with the dust and not the concrete.
If the concrete floor is very new, you have to be aware it takes time - 30 days per inch of new concrete - for it to dry out sufficiently before you can install any floor covering on it.
As for the bitumen, remove as much as possible (leaving just the "stain" of bitumen on the blocks, not actual bits of bitumen) because any residue will have a negative effect on the bonding time of the adhesive.
Have you had a look at our "7 easy steps to repair/restore your original parquet"?
Hope this helps
Wood You Like Ltd