Certainted GAF Owens Corning Celotex ELK Products Price   30year. Firehalt $ 47.82 / 3bundle(=100sq) birchwood oakwood cypresswood sage driftwood slate ebonywood weatherstone fernwood 40year. Firehalt 2000 $ 59.82 / 4bundle(=100sq) birchwood oakwood cypresswood sage driftwood slate ebonywood weatherstone fernwood