The method for testing slip resistance in friction improved roofing sheets has been criticized from several quarters. The purpose with this study is consequently to develop and improve this test method. The study started with an inventory which resulted in about hundred various apparatus. In the next stage the present test method was scrutinized and documented. In the last stage two different apparatus methods were evaluated, Apparatus for Slip Testing SS 92 35 15 and Drag Test Equipment ASTM-D 1894-78. In the two test methods the test sheets were ranked in a way similar to the present method. The reproducibility was investigated and was found to be very good for SS 92 35 15 and slightly worse for ASTM-D 1894-78.