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why does starter strip have glue on it if it goes on tar paper?

6K views 4 replies 4 participants last post by  MJW 
#1 ·
Just wondering...
The order of things is: flashing, tar paper, starter strip, shingles
Then why does the starter strip have the glue on the back? It's going to stick to the tar paper, but if the tar paper has no more than a few nails/staples, what good does it do to glue it to the tar paper?

I could see if the tar paper was glued or had more nails, but if it's going to blow up, it's just going to take the unglued tar paper with it.

am I missing something?
 
#4 ·
It's OC shingle starer roll, it says on the box to install granular side up and has a plastic cover over the sticky part.
I have one area that's less than 4/12, it's the porch and they want 19" of starter (no problem), just wondering if the tar paper only has nails every few feet, what's the point. Wouldn't it be better to have a bit if tar at the edge UNDER the tar paper to help hold it down?
 
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