ᐅ Overlaying Existing Flooring with Underfloor Heating

Hello everyone, we are planning to buy a house where the ground floor has tiles and parquet flooring. We would like to have a uniform floor throughout but want to avoid the effort of removing the old floors. I have read that it is possible to glue parquet flooring over tiles without affecting the performance of underfloor heating. Unfortunately, I cannot find any information about whether this is also possible with parquet—meaning new parquet over existing parquet. Or would it be better to install a uniform vinyl floor everywhere? Tiles are not an option. Thanks for your help!

Jsjsll00 schrieb:

I have read that it is possible to glue a parquet floor over tiles without affecting the performance of the underfloor heating.

I consider this statement at least questionable. People tend to believe information that supports their wishes or attitude.

Is the floor hydronic? Operated by a heat pump? (So low temperature?)

I suspect not much heat will pass through....

Parquet flooring is often not ideal when it comes to heat transfer. I don’t think you’ll be happy if you glue something on top of it, especially “new parquet on existing parquet.” I also wouldn’t install parquet over tiles on a heated floor, in my opinion. If you want to look up a keyword, search for “thermal resistance” (R-value) and see what is recommended and how your floor construction fits into that...

Jsjsll00 schrieb:

I have read that it is possible to glue parquet flooring over tiles without compromising the performance of underfloor heating. Unfortunately, I can't find any information on whether this is also possible with parquet installed over existing parquet (i.e., new parquet on top of old parquet).

Unfortunately, I have to tell you that this is physically nonsense.

You can install new tiles over existing tiles if the original ones are sturdy enough. However, this raises the floor level by the thickness of the new tiles plus adhesive, which is more suitable for separate bathrooms. The heat from underfloor heating will still pass through because stone is a good conductor.

Bonding an additional floor covering over parquet is not a good idea, as mentioned earlier. Wood is a poor and slow conductor of heat. The existing parquet floor already pushes the limits of heat transfer from the underfloor heating.

Another option is to fill the grout lines between tiles to create a completely flat surface and then glue down a design floor covering. Our children did this with terracotta tiles all over their underfloor heated floors. I personally felt it was a shame for the beautiful tiles, but well: young people rarely appreciate high-quality older floors and prefer the Pinterest and Instagram glossy look 😉

Jsjsll00 schrieb:

ein Haus kaufen

Jsjsll00 schrieb:

aber uns die Arbeit sparen

is not a good combination.

"ypg" has already pointed out all the relevant aspects on this topic.
The losses due to the excessively high thermal resistance (across all layers, including two layers of wood) suggest that a significant transfer of heat to the indoor air is unlikely.
Conclusion: Abandon the idea of how you want to construct the floor!
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Regards, KlaRa