Which way up should roofing membrane lie?

[David001]

Unfortunately I have just had a porch hood added over an external door and there are unbelievable flaws in the construction.

I'm not certain which side of the roofing membrane should be facing up and which side should be facing down.

The photos below show that the two pieces have been laid differently.  Which side is correct?

As the porch-hood is open to the atmosphere, how important is it that both pieces are correctly laid?  (Another flaw is that there is a visible hole in a tile on the right side of the porch.  It may not be the only hole.)

 

 

[BotusBuild]

I don't think the vapour barrier has a right way, but consistency is a good thing.

Looks like they painted the wood after fitting the vapour barrier. I wonder if they painted the top of each joist?

There shouldn't be a hole through the slates apart from where the nails are holding them. If that last picture is showing a "hole" that goes throught o the membrane, then for a new roof, that needs sorting.

 

I'd get them back to sort this last piece out at least. If they can't prove the top of the joists were painted (and if they should have done so) then looks like they have redo the whole job.