| Floors and base structures |
Vertical insulation of foundations or buried walls
| Application | I | S | O | L | Remarks |
| Vertical insulation of peripheral foundations or buried walls constructed on soil; internal or external insulation used with formwork or applied | 2 | 1 | 3 | 3 | DTU 20.1 and 23.1 |
Insulation of floor slabs laid directly on soil
| Application | I | S | O | L | Remarks |
| Insulation of floor slabs laid directly on soil for individual homes | 3 | 1 | 2 | 2 | DTU 13.3 Part 3 |
| Insulation of floor slabs laid directly on soil for other types of building | 5 | 1 | 2 | 2 | DTU 13.3 Part 1 or 2 |
Insulation of ground slab
| Application | I | S | O | L | Remarks |
| External peripheral insulation for base structures | 3 | 1 | 3 | 3 | Technical Assessments and Technical Application Documents |
| Insulation fixed mechanically to the underside floors above unheated spaces | 1 | 1 | 1 | 2 | Technical Assessments and Technical Application Documents |
| Insulation of floors above crawlspaces | 2 | 1 | 3 | 3 | Technical Assessments and Technical Application Documents |
Insulation beneath floor screed
| Application | I | S | O | L | Remarks |
| Coatings sealed with adhesive compound applied directly to the installation and subject to operating loads of ≤ 500kg/m² | 5 | 1 | 2 | 2 | DTU 52.1 and 52.10 |
| Coatings sealed with adhesive compound applied directly to the installation and subject to operating loads of ≤ 200kg/m² | 4 | 1 | 2 | 2 | |
| Floor screed subject to operating loads of ≤ 500kg/m² | 3 | 1 | 2 | 2 | DTU 26.2 and 52.10 |
| Floor screed subject to operating loads of ≤ 200kg/m² | 2 | 1 | 2 | 2 | |
| Low-temperature water-heated floors | 3 | 1 | 2 | 2 | DTU 65.14 |
| Electrically heated floor laid on cellular plastic insulation | 4 | 1 | 2 | 2 | Technical Assessments and Technical Application Documents |
| Electrically heated floor laid on mineral wool insulation | 3 | 1 | 2 | 2 | Technical Assessments and Technical Application Documents |
