Valley ridges and hips should have a 6 inch overlap of paper.
How to staple roofing felt.
Since you are new to the game i would greatly recommend you use 30 felt over 15.
I was on a shake roof and could see staples worked up over an inch.
If you live in an area with inclement weather you should consider using a special ice and water protector.
Roll out about 10 feet of felt and fasten with staples or roofing nails with plastic washer heads.
Sadly time has shown me differently.
Where a roll ends and a new one is begun the two rolls should be overlapped by four inches.
If you can find a roof with staples here because of code it is easy to identify them because so many have worked up.
Smooth out wrinkles as you progress to eliminate spots that could trap moisture and cause problems in the future.
The paper should then be nailed in or stapled every three to four inches across.
All nails and staples should be placed on the lower half of the paper.
Its way better to work with and will last longer.
The staples held better than the nails.
Unroll your felt and secure it to your roof with a staple every 8 inches.
How to do it.
If you are only tacking down the felt for while you roof the building then 3 8 tack hammer staples are more then enough.
Starting at the bottom of your roof unroll a few feet of felt lengthwise.
Install new flashing metal flashing is often called drip edge along the bottom of the roof near your gutters.
Use a construction stapler or a hammer.
Begin by using your staple gun to staple down the first part of your felt to the corner of your roof.
Overlap each row at least 3 to 4 inches.
Never install the felt vertically across your roof.
Cut drip edge flashing at an angle at the corner press it lightly against the eave end.
Put fasteners at least every 8 inches.
The tiny diameter of staple legs mean less hold with time.
Apply drip edge to the eave.
Place the replacement felt over the exposed area of the roof and secure using the arrow htx50 professional hammer tacker and 1 2 t50 staples.
Adjust the felt as you roll it making sure that it s straight with no bubbling.
Overlap and cut drip edges.
Apply and attach drip edge.