I just had new Certainteed Landmark shingles installed and notice that the black strip of adhesive(Underside of shingle) that is visible on the outer edges if the roof appear to have a clear film over them. Did my contractor make an error in the installation. TIA, James

James, January 2008

Get in touch with the installer and ask them, if you're not satified with the reply then go to Certaintedd website
www.certainteed.com and either phone or email them and ask.

Nobby, February 2008