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Influence of Roof Pitch on Indoor Thermal Conditions

Abstract

The study examines the influence of roof pitch on indoor thermal conditions, with emphasis on how variations in roof slope affect the thermal environment within occupied building spaces. Roofs form an important part of the building envelope and are directly exposed to solar radiation and outdoor weather conditions. The pitch of a roof can influence solar exposure, heat transfer, roof space volume, ventilation, and the rate at which heat is gained or dissipated within interior spaces. The study will assess different roof pitch characteristics and their relationship with indoor thermal conditions. Relevant parameters will include roof slope, roof form, roof orientation, roofing material, ceiling configuration, roof space ventilation, and the relationship between the roof and occupied rooms. Indoor thermal conditions will be assessed using indicators such as indoor air temperature, relative humidity, surface temperature, air movement, and occupants’ perception of thermal comfort. A descriptive comparative research design will be adopted for the study. Selected buildings with different roof pitches will be assessed through physical observation, roof and building measurements, environmental monitoring, photographic documentation, and structured questionnaires administered to occupants where appropriate. Data obtained will be analyzed using descriptive statistics such as frequency, percentage, mean, and standard deviation, while appropriate comparative or correlation tests may be applied to determine the relationship between roof pitch and indoor thermal conditions. The study is expected to reveal differences in indoor thermal conditions among buildings with varying roof pitches. Roof pitches that provide favourable solar exposure, adequate roof-space ventilation, and effective heat dissipation may contribute to more comfortable indoor conditions, while less suitable roof configurations may increase heat accumulation within occupied spaces. The observed effects may also vary according to roofing materials, ceiling construction, roof orientation, insulation, ventilation openings, building form, and surrounding environmental conditions. The findings will be useful to architects, building designers, housing developers, environmental designers, and other professionals involved in building planning and construction. The study may provide useful information for selecting appropriate roof pitches as part of passive strategies for improving indoor thermal comfort. The findings may also support the design of buildings that reduce excessive heat gain and dependence on mechanical cooling, thereby contributing to improved energy efficiency and environmental performance. The study will conclude by establishing the influence of roof pitch on indoor thermal conditions. It is recommended that roof pitch should be considered alongside roof orientation, roofing materials, ceiling design, insulation, and ventilation provisions when designing buildings for improved thermal performance. Further studies involving different building types, climatic conditions, roof materials, and roof configurations are recommended to provide broader guidance for climate-responsive roof design.

Keywords: Roof pitch, indoor thermal conditions, thermal comfort, roof design, roof geometry, indoor air temperature, relative humidity, heat gain, solar radiation, roof ventilation, roofing materials, ceiling design, passive design, building performance, climate-responsive architecture.