This report can be seen as a contribution to a broader discussion regarding mounting systems and attachments of PV on flat roofs (<6°). It is a direct continuation of the SIS TK193 manual published 2021, in which the frameworks for these installations were compiled. Industries taking part of and participating in the work are waterproofing, insurance, insulation, roof construction and PV. The purpose was to via testing define values for deformation and forces, and put together an assessment method for the product. Testing was carried through at the RISE facilities in HUS 11, Borås. Material and expertise for the test objects were delivered by project participants. Test series concerning loading in compression, tension and fatigue for a couple of attachment plates and a new rail system were performed. The plates were tested as only glued and also as glued and attached to the roof construction, and for two different waterproofings, i.e. PVC and bitumen. Due to the complexity of this problem, not all parameters were able to be studied in this initial project. It is therefore proposed that additional parameters are explored in a continuation project. The next step is suggested to be an ageing project with similar testing and a following waterproof testing.