Plastic strips on top of tar strip on top of 3 tab shingles. Nailed through plastic. Installed correctly?

My roof was installed with the long plastic strips left on top of the tar strip on each shingle. This tar strip is on the top side of the shingle directly above the 3 tabs. The shingles were nailed through this plastic strip. They did not disintegrate and seem to have been a barrier preventing the tar strip from sealing when it heated up. Was this installed correctly? I have wind damage due to a dozen or so tabs lifting up, bending over and breaking off. The back side of the broken tabs shows no sign of tar/glue and pieces of the plastic strips are still evident on the shingle tops that are now exposed. The plastic strip says do not remove on it. Why, and should it have been removed?Plastic strips on top of tar strip on top of 3 tab shingles. Nailed through plastic. Installed correctly?
That plastic strip should stay on the underside of the shingles, not on top. The only purpose is to keep the shingles from sticking together in the packaging. If the plastic strip is on top of the shingles, they were installed incorrectly and will prevent the shingles from sealing,Plastic strips on top of tar strip on top of 3 tab shingles. Nailed through plastic. Installed correctly?
Yes, the plastic strips are there to prevent the shingles from sticking together during shipping. While you don't want them to stick during shipping, you DO want them to bond to the shingle below when they are installed. This helps make sure the shingles form a water tight barrier on the roof. I also do not think the wind damage you describe is related to the improper installation. The wind would likely break off the tabs even if the plastic was correctly removed. You should call your roofer and have them tear off the roof and re-install the shingles correctly.
The purpose of the tar strip IS to seal the shingles together. The plastic is to stop the shignles from sticking together in the packaging. It sounds to me that your roofers did not know what they were doing.
Sounds like the shingles were put on with the backside up, granules down.





I have used 3 tab shingles in the past and have never had trouble with the plastic strip sticking to the tar strip.