Choreboy wrote:

Stapling sounds like a fast way to fasten felt to roof planks. Is it
more likely to leak than nailing? (A roofing nail has a head, but
maybe
the felt seals better around the leg of a staple.)
What length staples should be used? Where should they be placed?

Just be careful walking on the stapled felt, especially if the roof has
much pitch to it. It'll tear, and you'll go sliding off. I recommend
inch and a quarter nails through 30# felt for dangerous pitches. Tom