Specific rules for asphalt shingle roofing in mountain climates
Bitumen shingle roofs - Rules of the art and technical coding

This May 1977 DTU text is the only one with a "Mountain" chapter applicable to roofing structures, i.e. :

• by an altitude $⩾900\text{ m}$;

• for a normal snow load > 185 daN/m², as defined by current NV 65 rules.

The mountain climate is nevertheless characterized by :

• daily variations in surface temperatures ;

• localized or distributed snow and ice loads;

• siphoning phenomena;

• reduced periods of the year during which roof maintenance can be carried out.

The general provisions...