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.
How to start a 3 tab shingle roof.
Make sure to keep nails out of the tar strip as you work.
Continue to chalk additional guidelines based on the width of the shingle through at least four courses rows across the roof.
Drive a nail at one end first then drive the others.
If you are using a power nailer drive nails by squeezing the trigger and bouncing the nailer s tip onto the shingle.
However make sure that you do not nail into the tar strip.
Secure the horizontal flange to the roof deck using two nails.
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This saves a lot of time moving shingle bundles and a lot of back strain.
Attach and align shingles 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.
Use your chalk and tape measure to mark about 12 inches up on the roof for the first set of shingles.
Lay a starting row at the bottom of the roof along the edge.
Hammer in one nail about 2 inches from each end of each shingle and another nail about 1 inch above each cutout.
Nail the cut off shingle into place about 6 inches from its lower edge.
Both step shingling and racking will yield a watertight.
Starting at the bottom of the roof map out a guideline with chalk.
Step 3 start line.
You will then need to get your measuring tape out and measure the roof.
After completing a column the roofer can go back down to the eave edge of the roof and start laying the next column of shingles.
Place it so the tab of the end shingle covers it completely.
A chalk line will need to be popped going down the middle of the roof from the bottom to the top.
Place nails in the three tab shingles about 3 4 inch 1 8 centimeters above the cutouts near where the tab meets the upper part of the shingle.
Do not fasten the flashing piece to the vertical wall.