1. What is Interior Shiplap Coverage?

The interior shiplap coverage calculation determines how much wall area each board will actually cover when accounting for the overlapping portion (lap). This helps in material estimation and planning.

2. How Does the Calculator Work?

The calculator uses the shiplap coverage formula:

Where:

• \( board\_width \) — Total width of the shiplap board (inches)
• \( lap \) — Overlapping portion that gets covered by adjacent board (inches)

Explanation: The actual visible coverage is the board width minus the portion that gets overlapped by the next board.

3. Importance of Coverage Calculation

Details: Accurate coverage calculation is crucial for determining how many boards you'll need to cover a wall and for proper spacing during installation.

4. Using the Calculator

Tips: Measure your actual board width (including any tongue) and the overlap amount. Both values must be positive numbers (lap cannot exceed board width).

5. Frequently Asked Questions (FAQ)

Q1: What's a typical shiplap board width?
A: Common widths range from 5.5" to 8", but always measure your actual boards as sizes may vary.

Q2: How much overlap is typical?
A: Standard overlap is usually 0.5" to 1", but this depends on your specific shiplap profile.

Q3: How do I calculate total boards needed?
A: Divide your wall width by the coverage per board, then add 10-15% for waste and cuts.

Q4: Does this work for vertical shiplap?
A: Yes, the same calculation applies regardless of orientation.

Q5: What if my boards have a tongue-and-groove?
A: Measure the full width including the tongue, and the overlap is typically the tongue portion.