Osb for roof

[Jake2021]

Hi Guys,
Just looking to learn from your knowledge and experience
I’ve just built a extension/ conservatory thing on the back of my kitchen it’s not big maybe 3m wide and 2.5 metres deep, I’ve got two large Velux windows in the roof( 1m x 80cm )
Would it be acceptable to use 18mm osb small
Loft boards to put ontop of my membrane? I just feel having large sheets is going to be a nightmare to go around the velux’s due to the roof size and Velux size
There’s not actually that much roof left to cover lol , the finish on the osb will
Be lightweight plastic roof tiles
Thanks
Jake

 

[noseall]

Would it be acceptable to use 18mm osb small
Loft boards to put ontop of my membrane?

?

 

[^woody^]

As long as it's OSB 3 grade, as there is a moisture risk