The paper describes the experiment of fire resistance of a circumferential log-cabin wall fragment using various structural modification of the gap between two log members. The influence of the gap structural modification on the criterion of fire resistance E (envelop integrity) and I (insulation) is evaluated. The evaluating criteria are represented by the development of temperatures measured in various gap setups and photo documentation from the experiment. The experiment is supplemented by the theoretical calculation of the temperatures during a fire on the unexposed fragment side in two cases: according to the average temperatures on the specimen surface from the radiation panel and for the standardised fire temperature 1,000°C. The reason for the calculation is the verification of the I criterion (insulation) in connection with the U-value of the construction, i.e. heat transfer affecting the flashpoint temperature on the unexposed side of the log-cabin wall.

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