Which way for osb

[b21playa]

Hi all

Just taken delivery of 18mm osb for my flat roof and installing them Saturday but wondered which way they should be fitted; writing up or down. My thoughts are writing down

Thanks in advance

 

[oldbutnotdead]

Depends what you're covering them with. Writing up for GRP, suspect writing down for anything else (the blank surface is smoother, GRP bonds better to the rough surface)

 

[^woody^]

Just one way ... flat

 

[b21playa]

Depends what you're covering them with. Writing up for GRP, suspect writing down for anything else (the blank surface is smoother, GRP bonds better to the rough surface)

Being covered with epdm

 

[b21playa]

Just one way ... flat