Decking over OSB - how to protect it?

[smp50]

I have a shed base (framed in 100x50 stuff) decked in 19mm OSB. The shed itself doesn't cover the whole base - there's a strip about 400mm deep along the front (and the full 2400mm width of the shed) which is uncovered by the building (but overhung by the roof) left as a kind of porch or step.

I want to put something on top of the OSB in this space so that it doesn't turn to mush with rain and wet shoes.

If I put decking planks along it, the gaps in the decking will still permit water contact with the OSB (and probably keep it from drying). Could I, for example, put down a couple of layers of roofing felt on the OSB first, and then the decking? I have lots and lots of felt spare!

Would that be pretty good and water-tight for these purposes, or am I missing something?

Thanks,

 

[big-all]

wrong material really cut off 12mm behind the cladding face and extend the cladding down to protect the cut edge anything else is doomed to failure

 

[foxhole]

Big- all ? Cladding ? What cladding this is deck question.

 

[big-all]

cut back behind the area covered by the shed cladding
in otherwords reduce to the shed footprint and protect the exposed cut edges then deck as seperate job

 

[freddiemercurystwin]

He means cut back any exposed osb, prolly doomed to failure anyway.

 

[big-all]

He means cut back any exposed osb, prolly doomed to failure anyway.

yes thats the one