Essential requirements
The six essential requirements (ER) according to Annex I of the Construction Products Directive, which have to be fullfilled by a structure over an appropriate period of time (Durability) - given standard maintenance - are:
- ER 1 Mechanical resistance and stability
- ER 2 Safety in case of fire
- ER 3 Hygiene, health and the environment
- ER 4 Safety in use
- ER 5 Protection against noise
- ER 6 Energy economy and heat retention
