Heating screed on separation layer

According to DIN 18560-2, the following types of heating screeds are distinguished:

• Type A: the heating pipes are located in the screed above the insulation layer (wet-laid systems). Design advantage: particularly good heat dissipation to the surrounding screed.
• Type B: the heating pipes are located in the insulation layer below the screed (dry-laid systems). Design advantage: particularly easy creation of movement joints in the screed disc, thinner screed disc than with type A.
• Type C: the heating pipes are located in a levelling screed below the screed, between the levelling screed and the screed there is a separating layer (wet-laid systems).

In type A construction, flowing screeds are particularly suitable as heating screeds, as their very dense structure enables optimal heat transfer between the heating pipe and the heat transfer surface (screed).

Approved systems are common that include the impact sound insulation and the heating pipes, including the fastening, and which are completely laid by the heating engineer.

In the case of heated screeds, the heating circuits and screed fields must be coordinated with each other, and there must be no intersections of movement joints and heating elements. Heating connection pipes that cross movement joints must be protected, e.g. by approx. 30 cm long pipe sleeves.

In door passages, movement joints must usually always be provided for heated screeds, especially if the rooms are at different temperatures (e.g. door between bedroom and bathroom). Also for sound insulation reasons, a separation can be useful/necessary here.

Further requirements for heated screeds, e.g. for necessary pipe coverings, can be found in DIN 18560-2.

Image: Screed floating on separation layer - bauwion

Source: bauwion