Fixing Requirements
Typically, standard fixing requirements will be adequate for spring curved roofing. In some cases, however, due to a combination of spring curving and thermal expansion effects, screws are susceptible to shear failure. The problem is most likely to occur towards the ends of the sheets which are fastened to heavy supports with little or no flexibility. In this situation large loads are transferred through the fixing points which can lead to roof sheets tearing or screws shearing.