How much crimp would normally be put on a metal bevel for a 10" x 2" insulation?

• A. 1/2 inch
• B. 5/8 inch
• C. 1 inch
• D. 3/4 inch

Answer: (D)

The amount of crimp on a metal bevel is the bite or fold that grips the insulation to hold the bevel firmly in place. For a 2" thick insulation, about 3/4 inch of crimp provides a secure bite that keeps the bevel from slipping without crushing the insulation. A smaller crimp like 1/2 inch or 5/8 inch wouldn’t hold as well and could loosen with handling or vibration, while a larger crimp like 1 inch would over-press the insulation, risking damage or an uneven seam. So 3/4 inch strikes the right balance for a 10" x 2" piece, giving a tight, durable fit.