If restoration isn’t possible, the roof beam must be completely replaced. In many cases, this process will be as overwhelming as it sounds. In other cases, not so much. The price tag for this method of repair depends on several factors.You can expect that extracting one of these will be, at the very least, time-consuming, messy, and expensive. The size and scope of this kind of project is best suited for a company with a sizable crew; this is a service I do not offer. In short, the best answer is not to find yourself in this position. Attend to roof beam decay as soon as you are aware of it. See how to identify decay: Detecting Roof Beam Rot. Complete roof beam replacement can be avoided. With dry rot, the worst thing is to do nothing at all.