Spacing between screws / rule of thumb

[shd1970]

Can anyone confirm please if there is a rule of thumb for spacing between screws ?

I’ve used 18mm osb3 on my flat garage roof using these screws as they adhere to the x 2.5 rule which seems to be an accepted standard for length, but I’m unsure on spacing between

https://www.screwfix.com/p/goldscre...l+Content&utm_content=TextLink&utm_term=58258

many thanks in advance !

 

[mrrusty]

300mm spacing is fine. You have left a 3-4mm gap between the boards haven't you?

 

[shd1970]

300mm spacing is fine. You have left a 3-4mm gap between the boards haven't you?

thanks Rusty

the boards are t&g but I’ve left a few mm where the boards meet the walls of the houses each side so hopefully that’s sufficient