Never install the felt vertically across your roof.
How to install a shed roof.
To build a shed roof you ll need rafter boards plywood gusset plates plywood sheathing felt roofing paper and shingles.
Install the panel so that the short lip overlaps the large lip.
In order to make your roof water tight and to eliminate wind infiltration first place tar on the bottom edge of the roof and lay a row of roofing shingles upside down all the way across the bottom of the roof.
Roofing shingles come in strips that are generally about 3 feet long and 8 or 10 inches wide.
Screw the new panel in place as described.
Metal roofing is also available in the form of shingles.
Start installing roof shingles.
For hip type shed roofs which include slopes on all 4 sides begin at the square hip at the top of the roof.
The silicone will spread and adhere creating a seal.
Continue adding panels until the roof is covered.
First cut your rafter boards to size using a circular saw to make sure they fit your roof.
Allow about 1 foot 0 30 m of the felt to hang over the hip.
Adjust the felt as you roll it making sure that it s straight with no bubbling.