Most construction products are used together in a "system" – the building. A Type III declaration for construction products, which then also helps to evaluate the entire building, is therefore obvious. Resource consumption and emissions into the environment are absorbed throughout the manufacturing process. The resulting contribution to the greenhouse effect, to overfertilization or acidification of water can be quantified and evaluated using the life cycle assessment methodology. Life-cycle assessments thus provide a systematic and standardised data basis in order to create an ecological assessment of a building in the "building block system" from declarations of individual construction products. A life cycle analysis takes into account the entire life span of the building, the construction phase, the use phase with possible conversions as well as demolition and disposal, and the contribution of the construction products to energy efficiency or to other aspects of sustainable management of a building can be presented.
The declaration makes statements about the use of energy and resources and the extent to which a product contributes to greenhouse effect, acidification, overfertilization, destruction of the ozone layer and smog formation. In addition, information is provided on technical characteristics required to assess the performance of the building product in the building, such as service life, thermal and sound insulation or the influence on the quality of the indoor air.
With these quantitative statements on the environmental performance of construction products, the ISO Type III Declaration addresses many addressees:planners, architects, construction companies, real estate companies, facility managers and, of course, companies that are involved in the value chain from raw materials to buildings with manufacturing and service.