Hi @Gemma_Baird,
I’m with @sjdorst on this one.
It’s hard to imagine a case where it would be advantageous to model the individual roofing tiles rather than using an imported texture to illustrate the roof finish. It’s much quicker and it results in a more efficient model size.
Are you attempting to model a roofing detail similar to something illustrated below for use in a set of ConDocs?
If so, this can be done with a detail model that shows only a portion of the building and this would be referenced to a LayOut file. For this type of detail, the tiles need not be shown
as they would actually be constructed because they will be seen in section view only.