[header] How to wrap beams [title] Measure your beams. [step] Get a tape measure and check the length of each beam you want to cover, from one end to the other. Have someone hold the tape measure at one end of the beam while you run it to the other end to check the length. 
You'll probably need to stand on a ladder or other safe surface to reach the ceiling. [substeps] Use only a ladder that has 4 feet (1.2 m) that sit flat on the floor.