i always call a roach the very end of a joint that u cant smoke cuz u burn ur fingers, but then agian i dont no much about joints or roaches i just smoke bowls cuz i suck at rolling and im to lazy to roll i'yd just rather pack a bowl. but quick question ... i remeber reading online that a roach is the strogest part of the joint becuase it collects resin and thats why its all brown and kinda gooey, if u use a carboard roach do u think the resin would build up on the card board and go to waste?