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The paper discusses service load measurements (weight of construction materials, small equipment and workers) conducted on 120
frame scaffoldings all over Poland in 2016‒2018. Despite the fact that the scaffolding should ensure the safety of its users, most accidents on
construction sites are caused by fall from height. Service loads are one of the elements affecting the safety of scaffolding use. On the basis
of the studies, maximum load on one platform and maximum load on a vertical scaffolding module for one day were obtained. They were
treated as the random variables of the maximum values. Histograms and probability density functions were determined for these variables. The
selection of a probability distribution consisted in the selection of a probability density function by means of fitting curves to the study result
histograms using the method of least squares. The analysis was performed for distribution Weibull and Gumbel probability density functions
which are applied for maximum values of random variables. Parameters of these functions can be used for the purposes of the reliability analysis
to calibrate partial safety factors in simulation of service load during the scaffolding failure risk assessment. Besides, the probability of
not exceeding the standard loads provided for frame scaffoldings for 120 weeks was established on the aforementioned basis. The results of
the presented research show that in Poland there is a high probability of exceeding the permissible service loads in one year and thus there is
a high risk of scaffolding damage.