My master bedroom is on a crawlspace and it isn't insulated at all. The access is very hard to get into as a couple cinder blocks were knocked out and a door was installed. Give or take 16 inches of space. There is a metal 'L' bracket that runs along the top of the blocks and a floor joist is resting on that. I would like to header off the floor jois and cut the bracket flush with the opening. Is there a maximum distance I can cut a floor joist back before headering it off? Do I have to ladder the inside of the joist space with 2x4's? This is a 2x8 joist by the way. Thanks for any info, and I'll try to post a pic since I am normally not good at explaining things, Dave Wanna kill these ads? We can help!