Talk:List of commercially available roofing materials

External links modified
Hello fellow Wikipedians,

I have just modified one external link on List of commercially available roofing material. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
 * Added archive https://web.archive.org/web/20150526171509/http://www.concreteconstruction.net/Images/Concrete%20Roof%20Systems%20Part%20I_%20Precast_Prestressed%20Construction_tcm45-348518.pdf to http://www.concreteconstruction.net/Images/Concrete%20Roof%20Systems%20Part%20I_%20Precast_Prestressed%20Construction_tcm45-348518.pdf

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

Cheers.— InternetArchiveBot  (Report bug) 22:28, 20 May 2017 (UTC)