Velux/Fakro skylight edge allowance for sip roof panel

[magutosh]

Hi everyone,

 

Has anyone installed skylights on sip roof panels and if you recall the allowance for width and height for the opening?

 

For example, how big an opening would be needed for 780x980 skylight please? It'll be either Velux or Fakro.

 

Thanks in advance.

 

Regards

Dominic

[the_r_sole]

look up your rooflight installation manual and it tells you the size of opening you need in the roof