The purpose of the study was to determine temperature variations in glazed roofs. Temperatures were measured in two buildings: the offices of Lasitukku Oy and the Siuntion Kylpylae bathing establishment of special interest were temperature differences between day and night, maximum and minimum temperatures, temperature distributions in the roof, maximum heating and cooling rate, and occurance of water vapour condensation on inner or outer surfaces. The results showed the maximum temperature difference between day and night to be 50 deg C and maximum temperature variations during the time of measurement 80 deg C. The maximum temperature of the outer surface was 66 deg C and the minimum temperature -22 deg C. Metallic roofs parts were of equal temperature +- deg C in both winter and summer. Maximum heating rates of outer surfaces were 10-13 deg C/h and minimum cooling rates 15-25 deg C/h. No water condensation was observed on either surfaces of the roofs. In Lasitukku Oy the roof glass is a sealed double-pane unit, the inner pane being electrically heated. This minimizes the risk of condensation At Siuntion Kylpylae the roof glass is a sealed triple-pane unit In Siuntion Kylpylae condensation would have occurred during the coldest night according More>>
Hemmilae, K 
- Technical Research Centre of Finland, Espoo (Finland). Building Materials Lab.