Is 2-layer parquet an alternative to 3-layer parquet with underfloor heating and bonding?

Hello everyone,

we want to install parquet (oak farmhouse plank) with underfloor heating and cooling in our new build. Most commonly, 3-layer click parquet is offered, which is suitable for both floating and glued installation. Due to the underfloor heating, we definitely want to glue it.

Does it make sense to use as thin a parquet as possible because of the already high thermal resistance of wood? I understand that the heating will run quite constantly in continuous operation, but won't the heating still be too sluggish with a parquet thickness of 15 mm? Will I even achieve the same temperature on the parquet surface as on the screed (29°C)? There is 2-layer parquet (10 mm) with a wear layer of 3.5 to 4 mm. If glued, there are no disadvantages compared to a 3-layer construction (15 mm) with the same wear layer, right? As I understand it, I only need the 3-layer construction for floating installation, correct?

Thanks for your assessment! Best regards

You won't notice a few millimeters. The minimal difference can be calculated, but not felt with your feet. 29 degrees will not be reached with any parquet anyway. 29 degrees supply temperature will be about 26 degrees on the surface of the parquet. I currently have 13.5mm plus adhesive.

Addendum: no, you have no disadvantage if you install in two layers

You don't notice a few millimeters. The minimal difference can be calculated, but you can't feel it with your feet.

2-layer with 10 mm should be about 0.076 m² K/W. 3-layer with 13.5 mm about 0.11 m² K/W. These values must be taken into account in the heating design, right?

Addendum: no, you do not have a disadvantage if you install two-layer

ok, thanks. I thought so already. I was still concerned that the parquet might be more pressure-sensitive due to the thinner substrate.
Two-layer is definitely somewhat cheaper.

The values must be taken into account when designing the heating system, right?

No. At most a distinction between wood and tiles. If the screed is 3mm thicker, you also don't recalculate. Or if a heating circuit becomes 2m longer.

I was still concerned that the parquet might be more pressure-sensitive due to the thinner subfloor.... 2-layer is definitely somewhat cheaper.

You don't need to worry about that. The wood as a covering is more relevant. Maple or Wenge are indeed differences.