This basic rule applies to nodes where the insulation layers do not (cannot) interconnect, although the possibility of inserting insulating parts does exist. These insulating parts assume the thermal insulating function of the insulating layers locally, ensuring the continuity of the thermal break, such as at the junction of a flat roof and an exterior wall or the foundations.

Basic Rule 2 proposes that all insulating parts must satisfy all 3 of the following requirements:

The λ-value of both the extruded polystyrene foam (λ = 0,030 W/mK) and the (nano) polymeric concrete (λ = 0,165 W/mK) in Marmox THERMOBLOCK® is less than 0,2 W/mK, so this requirement is satisfied. Furthermore, given that the volume share of the (nano) polymeric concrete is ≤ 10% per running metre of linear node, this can be viewed as a permitted local interruption of the insulating part, as a consequence of which λ(insulating part) is fixed at 0.030 W/mk.

The R-value requirement states that the thermal resistance R of the insulating part is ≥ half of R1 or R2, whichever is lowest (where R1 and R2 are the thermal resistances of the connecting insulation layers). To ensure this requirement remains feasible in the event of very high values of R1 and R2 (thick insulating layers), an upper limit is imposed on R: 2 m²K/W. Marmox THERMOBLOCK® R2 nano has an R-value ≥ 2 m²K/W and so always provides a sound solution that does not require any further calculations.

Where an insulating part (with a given thickness) connects to an insulating layer or another insulating part (with a given thickness), the contact length must be ≥ half of the smallest of the two thicknesses. Subject to the correct features, Marmox THERMOBLOCK® can always satisfy this requirement (see pp. 8, 9, 10 and 11).