WC pan to floor, washer?

[ash_scotland88]

I've refitted our WC after flooring went down, all good no leaks but I feel like some bolt accessories where missing.

 

Should some sort of washer be fitted between the wc pan and bolt/screw connecting it to the floor? Or is the metal on porcelain ok? I've re-used what the plumber put in place.

[Redbeard]

I have seen 'upside-down top-hat' plastic washers used, but equally I have just had steel screws. Not had a pan break yet...

[torre]

I think it's good to have something between the screw and the pan that will break or deform before the porcelain will crack and also to spread the stress over a bigger area than the screw edge touching the pan. 

Pan fixing kits may have a plastic washer with a cap but a rubber washer with a blob of silicone would do