What does a bevel cut typically prepare insulation for?

A bevel cut is specifically designed to prepare insulation for fitting into corners or unions. This type of cut allows the insulation to seamlessly align with adjacent surfaces, which is particularly important in ensuring an effective thermal barrier and maintaining the integrity of the insulation system. By angling the edges, the insulation can better conform to the shape of the structure it is being applied to, preventing gaps that could lead to heat loss or energy inefficiency.

In terms of context, while joining materials or creating aesthetic finishes may have their own applications in insulation work, these are not the primary purpose of a bevel cut. Extending insulation length does not relate to the bevel cutting technique either, as bevel cuts focus more on shaping the insulation to fit specific locations rather than altering the length. Therefore, the option that accurately captures the function of a bevel cut is in preparing insulation for fitting into corners or unions.