Install a starter course by cutting off the three tabs on a shingle leaving only the top tar section.
How to roof a house with three tab shingles.
Pattern curling is caused by the roofer having to lift the end tab of every other shingle to install the last shingle nail at the end of the next shingle.
As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.
Do not fasten the flashing piece to the vertical wall.
Secure the horizontal flange to the roof deck using two nails.
The average 3 tab shingle needs four nails per shingle.
High wind areas and other types of shingles may need more.
Do this on both sides of the roof.
Row 7 begins with a full 3 tab shingle.
Place it so the tab of the end shingle covers it completely.
To attach a 3 tab shingle align it with the layout line and drive nails 1 2 inch above the cutout slots including the half slots at each side.
This will allow the flashing piece to move independently of any differential expansion and contraction that may occur between the roof deck and the wall.
320 nails will be needed to install a square of standard 3 tab shingles assuming four nails per shingle and 80 shingles per square.
Use your chalk and tape measure to mark about 12 inches up on the roof for the first set of shingles.
Begin row 4 with a shingle cut in half 1 and tabs and complete that row.
Align and install the 2 tab shingle aligned with the next 5 inch higher chalk line.
Use the chalk line to snap a straight line vertically every 6 inches.
Drive a nail at one end first then drive the others.
However shingles are packaged in a way that they are light enough for the average person to carry around.
Every 5 inches make a new mark until you get to the rop of the roof.
Begin row 5 with the 1 tab shingle and row 6 with the 1 2 tab shingle.
A square of shingles is the number of shingles needed to cover 100 sq feet of roof area.
Repeat this on both sides of the roof.
Use the chalk line to snap a straight line vertically every 6 inches.
Complete the row with 3 tab shingles.