How often to nail clay tiles?

[sirocosm]

I am roofing my workshop with these as they match our house:
https://www.wienerberger.co.uk/product-range/roof/tempest-44-natural-red.html

They have two little holes at the top to screw into the battens. On our current roof from the 30s, they are not nailed down at all. Having said that, sometimes the wind blows the odd one off, and then it needs to be replaced.

On the workshop I was thinking to nail down the edges, and every 3rd row, or something like that. It seems to me that if they are all nailed down, it would be very difficult to do any maintenance.

What is normal practice for nailing down clay tiles?

 

[datarebal]

Check the sandtoft website.
These are pretty light weight tiles.
I'd nail all and clip if you are in an exposed area

 

[sirocosm]

It is not so exposed, and only single story. If possible I would like to be able to remove tiles for maintenance. I plan to screw them down with stainless screws, not nails. I was thinking to fasten the verge tiles, the eaves, and those under the ridge. For the rest I am not sure if I should do every 3rd or 4th row, or if more of a checkerboard pattern would be better. In any case I would like the fastened tiles to be far enough apart that I can remove tiles if I have to.

 

[datarebal]

What do you want to maintain?

 

[sirocosm]

The roof itself mostly. It always seems something goes wrong. A tile cracks and needs replacement, a ridge tile comes loose. It would just seem easier if you can move some tiles aside.