Along with the use of floor heating, the insulation of intermediate floors has become more and more common. In order to conduct the heat to the upstairs floor rather than the downstairs ceiling, thermal insulation is required between the heating system and the ceiling below. Intermediate floor insulation is also required above cold storage rooms in basements, for example.
Finnfoam's thermal insulation properties are approximately five times greater than wood. If the floor is covered with approximately 1 cm of wood and 90% of the heat is to be conducted to the floor, a Finnfoam layer of approximately 2 cm is required under the floor heating channels (water cycled or electric).
In floor heating configurations with heated rooms both above and below the intermediate floor, the recommended Finnfoam thickness is 30 mm, while the recommended vertical insulation thickness for intermediate floors between heated and unheated rooms (such as a root cellar at +5°C) is 100 mm.
Finnfoam insulation boards are durable and withstand construction-time loads well, even when used as relatively thin layers. The fact that Finnfoam insulation materials are waterproof is also useful in the event of flooding. The Finnfoam boards will remain dry, which makes drying out the structural elements easier. Even small leaks are detected quickly as water cannot accumulate in the insulation material and is therefore spotted more easily. Finnfoam insulation materials also reduce the sound of footsteps, but please note that Finnfoam is not an actual sound insulation material.