Here is a list of some of the manufactorers we are approved by:

Kopper Industries http://www.koppers.com/

Johns Mansville http://www.jm.com/

GAF Materials Corporation http://www.gaf.com/General/GAFintro_MAIN.asp

Firestone Building Products http://www.firestonebpco.com/

Siplas/Icopal http://www.siplast.com/

Garland Company http://www.garlandco.com/

Tamko http://www.tamko.com/

Carlisle http://www.carlisle-syntec.com/

J.P Stevens http://www.jpselastomerics.com/

Soprema http://www.soprema.com