To reduce the potential for shading:
Do not mix shingles with different production codes on the same roof.
Make sure you follow the application instructions provided on the shingle wrapper, and also available on this web site.
Apply the shingles starting from the bottom of the roof and move across and up.
Use blended shingle colors instead of solid colors.
Do not stack shingles higher than what is recommended by the manufacturer.
Do not store shingles for long periods of time.