Shading by Surrounding Obstacles

Abstract

Shading by surrounding obstacles is one of main parameters which must be considered in building design. The aim of this paper is elaboration of the façade Daylight Factor (Dw) and shading angle problems defined in the Czech Technical Standards (ČSN) - Daylighting in residential buildings ČSN 73 0580. The measure of Dw represents the value of incidental shading by surrounding obstacles. Sometimes in practice are designers dealing with administrative requirements of officials because of not exact specification of conditions in building law and consequently in ČSN. Because of not exact specifications is happening that officials are requiring requisite assessments. Such issue occurs sometimes also in problem of Daylight Factor Dw – it is not exactly determined when is an assessment of Dw necessary. This paper focused on the definitions mentioned in building law and ČSN related to this issue and proposes specific conditions for eventual Dw assessment.