Which way round to lay felt roof on my garden shed

[mindoversplatter]

Dumbest question ever I know, but the felt that's come with my new shed is light grey on one side and dark grey/black on the other side. Which way should face upwards please?

 

[mindoversplatter]

Update: The light grey side is rough so I will lay with it facing upwards. Also, 1 day after building shed, there are literally hundreds of tiny flies crawling all over the wood. Any idea what they are, and will they eat the wood? Thanks

 

[conny]

Could simply be midges after the moisture in the wood. When the weather gets a bit humid we tend to get what we call 'Thunder Flies'.
They are tiny black flies which can even get through fine mesh.
Simply vacuum them up. When I vacuum them up inside my workshop I tend to spray inside the collection bag with a dose of fly killer just to make sure they die.

 

[Odds]

He's right, though. It is the dumbest question ever.

 

[mindoversplatter]

Not such a dumb question. this time. My pent shed came with 4 fascias to place on all 4 sides of the roof to cover where the felt overlaps. I have seen a video on youtube warning not to place a fascia on the lowest side cos it will trap rain water. Do I just do the other 3 sides, and maybe add a guttering to the low edge? If yes, i may add a small water butt if available as no room for a big one.

 

[Larry1990]

Yes blocking off 3 sides will prevent water running off edges you don't want them to. You can fix a treated batten or similar to the gutter edge to help deflect water into the gutter.