Why is the film with the words "When installing do not shoot" on Shingles

When I mounted the shingles on drovennike (talking about it here), Did not immediately drew attention to the inscription on the reverse side on sheets with shingles:

Two film webs are adhered on the back side. On one was written "Remove before installation. On the other: "When installing do not shoot!". Under the same coating films. The film is also the same. Although, on the "teeth" is removed from the bottom easier.

Because Overlap the sheets are mounted, then why the manufacturer against an additional sheets from sticking together in the already mounted top and defended the place film - for me, at first it was not clear. In response to impel the strip of bitumen on the face of the sheet:

For better adhesion, sintering sheets in hot sunny weather, apply additional strips. But in order in packs because these strips sheets from sticking together - the reverse side was applied a film to which adhesion is minimal.

It turns out, that the sheets in packs slightly adhere to each other but are easily separated.

At the beginning of his film installation with the words "When installing do not shoot!" I still cleaned. She struggled, but it was withdrawn. I think additional adhesion sheets already mounted the roof of the excess will not be with each other.

Such a belt with fixed bandwidth is not at all producers and not at all product lines:

But still it occurs. In the video below of how states:

TM "Technonikol" the presence of these non-removable films, too, due to the fact that the sheets have not stuck together in packs.

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