Limitations on roof coverings by designation and distance

Table 5.7 Limitations on roof coverings Designation of covering of roof or part of roof | Minimum distance from any point on relevant boundary --- | --- National Class | European Class | Less than 6 m | Not less than 6 m | Not less than 12 m | Not less than 20 m AA, AB or AC | BROOF(t4) | ✓ | ✓ | ✓ | ✓ BA, BB or BC | CROOF(t4) | X | ✓ | ✓ | ✓ CA, CB or CC | DROOF(t4) | X | (1)(2) | (1) | ✓ AD, BD or CD | EROOF(t4) | X | (1)(2) | (1) | (1) DA, DB, DC or DD | FROOF(t4) | X | X | X | (1)(2) Notes: ✓ Acceptable. X Not acceptable. (1) Not acceptable on any of the following buildings – (i) a dwellinghouse in a terrace of three or more dwellinghouses; (ii) a building of Purpose Group 6 or 7 of any size; and (iii) a building of any other purpose group with a cubic capacity greater than 1500 m³. (2) Acceptable on buildings not listed in Note 1 but only where that part of the roof is – (i) not more than 3 m² in area; (ii) not less than 1.5 m from any similar part; and (iii) the roof covering between any such parts is a material of limited combustibility.