If there is only a little space left then you re fine and don t have to lay another row yet.
How to put shingles on a slanted roof.
Lay the last ridge cap shingle in the center of the shed roof on top of the exposed adhesive portions of the two center ridge cap shingles.
Once you have done this align the bottom edge of each shingle with the bottom edge of the starter roll.
Every 5 inches make a new mark until you get to the rop of the roof.
Use your chalk and tape measure to mark about 12 inches up on the roof for the first set of shingles.
Secure the last ridge cap shingle with four nails at the corners of the shingle and cover the nail heads with roofing cement.
Nail the shingles in place.
For best roof performance casma recommends the use of self adhering waterproofing membranes.
Repeat this on both sides of the roof.
Ideally the top edge of the last shingle row is flush with the top edge.
Since ice dams can be more severe on lower slopes the membrane should extend up to a minimum of 900 mm 36 beyond the interior face of the exterior wall.
Many pros shingle in a vertical line up the roof because it s much faster.
Use the chalk line to snap a straight line vertically every 6 inches.
Install your shingles to the top edge of your lean to roof.
Cover the entire low sloped roof area with an sbs membrane cemented at the vertical laps.