Hithe blueborad will be install outdoor and it will get wet from the rain anyway do it necessary to seal both side (front and the back) before rendert ...

Hishall we seal the timber sleeper as well or not thanks

I’m thinking to do similar projectInstalling blue board on top of timber sleeper retaining wallso about the sealing at the back of blueboardwhich seal ...

Hijust wondering which part need to be sealed?thanks