1. What is the Lap Siding Calculation?

The lap siding calculation determines the number of siding boards needed to cover a wall based on the wall dimensions and board specifications. It accounts for the exposure (visible portion) of each board.

2. How Does the Calculator Work?

The calculator uses the lap siding formula:

Where:

• \( wall\_height \) — Height of the wall (inches)
• \( exposure \) — Visible portion of each board (inches)
• \( wall\_length \) — Length of the wall (feet)
• \( board\_length \) — Length of each board (feet)

Explanation: The equation calculates vertical boards needed (wall height ÷ exposure) multiplied by horizontal boards needed (wall length ÷ board length).

3. Importance of Accurate Calculation

Details: Proper calculation ensures you purchase the correct amount of siding material, minimizing waste and additional trips to the supplier.

4. Using the Calculator

Tips: Measure wall dimensions carefully. Typical exposure is 4-8 inches. Always add 10% extra for waste and cutting.

5. Frequently Asked Questions (FAQ)

Q1: What is standard board exposure?
A: Most lap siding has 4-8 inches of exposure, but check manufacturer specifications for your specific product.

Q2: Should I account for windows and doors?
A: Yes, subtract these areas from your total wall area for more accurate calculations.

Q3: How much extra should I buy?
A: Typically 10% extra for simple walls, 15% for complex designs with many cuts.

Q4: Does this work for vertical siding?
A: The principle is similar but calculations would be adjusted based on horizontal rather than vertical exposure.

Q5: What about corner boards and trim?
A: These need to be calculated separately as they're not included in the lap siding calculation.