Alcoa Building Products

http://www.alcoahomexteriors.com/

Airvent, Inc.

http://www.airvent.com/

CertainTeed Corp. Shingles

http://www.certainteed.com/

ELK Shingles Manufacturer

http://www.gaf.com/

GAF Shingles

http://www.gaf.com/

IKO Shingles

http://www.iko.com/

Maze Nails (Peru, IL)

http://www.mazenails.com/

Owens Corning

http://www.owenscorning.com/

Peterson Aluminum Corp.

http://www.pac-clad.com/

Tamko Shingles

http://www.tamko.com/

Velux Skylites

http://www.veluxusa.com/

Illinois Attorney General Lisa Madigan's Office

http://www.illinoisattorneygeneral.gov/

Better Business Bureau, Chicagoland Area Including Rockford, Illinois

http://app.rockford.bbb.org/report/1003898