I have a 16x14 wood shed roof that I have built and laid shingles on. The roof is a single slope, and I have laid all shingles (first time I've done this), and have made it to the top of the roof. I don't quite know how to 'finish' the top. I have installed an edge drip guard around the entire roof edge, and the nails for all shingles are hidden except I don't know how to to hide the nails in the top row (which usually would be covered by the next row). Should I just put tar over the nail head? Or cut off the part of each shingle for the last row that is used to nail the next row down, and glue the rest down somehow?

Sorry for the novice question, I can find lots of answers if I have a roof ridge, but I don't have one!

 

If you would like to cover up the drip edge you just rip that last row of shingles about 5" wide and face nail it over the drip edge. Then caulk the heads of those nails. You might also want to put some roof sealant on the last 5" of butt joints that you will be covering up with that final shingle.