Abstract
This report presents proposals for defining means of regulating the use of combustible materials and products in external walls. Required protections are based on the quantities of fire loads and their contribution to fire development. The study is based on life safety and protection of property priorities taking into account reaction to fire classes related to different types of fire loads and fire compartmentation requirements of the adjacent spaces of concern. The proposals include the following main principles in relation to fire-separation requirements: In case of internal fire exposure the protective structure for combustible building parts needs to meet at least half of the fire-separating requirement for the compartment of concern. In case of external fire exposure the protection time requirement can be 15 minutes less than for the internal protection. The proposals are applicable for residential buildings and offices. In case of buildings with longer evacuation times more stringent requirement levels may be considered. For verification of protection performance of fire loads it is proposed to use existing standardized test methods (fire protection ability (K classes) and fire-separating function (EI classes) validated methods of calculation and/or large scale fire testing. © Owned by the authors, published by EDP Sciences, 2016 Language: en
Highlights
More stringent energy efficiency requirements for buildings have increased insulation layer thicknesses and the use of combustible insulation materials in external walls
A prerequisite for the assumption that combustible building materials/products need not to be taken into account in fire development, is that the fire load of concern will not contribute to fire in a certain time
It can be assumed that combustible building materials/products need not to be taken into account in any case in fire, when the fire load of concern will not contribute to fire development during the whole fire duration
Summary
More stringent energy efficiency requirements for buildings have increased insulation layer thicknesses and the use of combustible insulation materials in external walls. A prerequisite for the assumption that combustible building materials/products need not to be taken into account in fire development (and in consequences of fire spread), is that the fire load of concern will not contribute to fire in a certain time (e.g. time needed for safe evacuation). This means that combustible products usually need to be covered by protective layers and the protective performance is related to the assumed fire exposures of concern.
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