A simpler and very useful purpose for using starter shingles along the rake edge is that it gives the installer a nice straight line to use as a guide when ending each course of the field shingles.
Roof shingle cellophane strip.
To prevent shingles from sticking to each other while still in the bundle manufacturers add a small strip of cellophane on the back of each shingle.
This article discusses best roofing practices for the installation of asphalt roof shingles including installation temperature shingle sealing methods shingle course offsets asphalt shingle nailing location and specifications low slope and steep slope limits for asphalt shingles and roof flashing at building eaves and around skylights.
For an overview on changing the roof or roof covering on a house and special information on mansard roof shingles follow this link.
Iko s roofing shingles feature an adhesive strip on the back.
Gaf mastering the roof chapter 09 this video demonstrates the proper installation technique for gaf starter strips.
The cellophane strip or in some products a plastic or wax coated paper strip found between individual asphalt roof shingles and located just over the glue strip that bonds shingles together is factory installed to prevent shingles from sticking together while they are still in the bundle in storage.
This prevents the shingles from sticking together when storing and shipping bundles to the work.
The starter shingle if you put the first row of shingles on the edge of the roof just like all the rest you will see the bare roof deck through the cracks between the shingles.
A superior alternative to starter shi.