Snow falling off roofs of houses in cities and towns in snowy regions often causes problems with neighbors and injuries or even deaths. One solution for such problems and accidents is to use snow guards on sloped roofs to prevent the sliding of snow. Experiments were carried out in this study on the strengths of snow guards and spacing between snow guards on a sloped roof. The following results were obtained. 1) The smallest value of the coefficient of friction should be used for calculating the number of necessary snow guards. The coefficient of friction between the roofing material and snow on the roof is smallest in the case of wet granular snow. The results of an experiment showed that a coefficient of friction of less than 0.1 should be used for calculating the number of necessary snow guards. 2) The results of an experiment on strengths of snow guards showed that there was a difference of about two fold between the weakest and strongest snow guards, indicating that the strength of snow guards should be considered when determining the number of snow guards to be used on a roof. 3) Snow guards should be attached at intervals that will prevent creeping of the snow between snow guards. Creeping of snow on a sloped roof occurs more easily the thinner the layer of snow is. The results of an experiment carried out on roofs with gradients of 21.8-30.9 degrees showed that snow guards must be attached to the roof at intervals of less than 680 mm in order to prevent creeping of a snow layer of 10 cm in thickness.
