- 1). Place the ladder underneath the attic access panel in the ceiling. Climb the ladder and remove the access panel.
- 2). Enter the attic, being sure to bring your tools with you.
- 3). Place the end of the framing square against the bottom edge of a roof rafter.
- 4). Place the level in front of the framing square at the 12-inch mark. Adjust the level until the bubble is centered between the two marks on the glass cylinder.
- 5). Slide the level up until it touches the edge of the roof rafter, making sure the bubble remains centered in the cylinder. The level needs to stay at the 12-inch mark of the framing square.
- 6). Read the inch marking on the level where it intersects with the framing square. This number is the top number of the rise over run fraction.
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