1. What is Asphalt Starter Strip Calculation?

Definition: This calculator determines the linear feet of asphalt starter strip needed for a roof based on its perimeter.

Purpose: It helps roofing professionals and DIYers estimate the amount of starter strip material required for proper roof edge protection.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( L_s \) — Length of starter strip needed (feet)
• \( P \) — Perimeter of the roof (feet)

Explanation: The roof perimeter is divided by 2 because starter strip is typically applied to half the perimeter (eaves only in most cases).

3. Importance of Starter Strip Calculation

Details: Proper starter strip installation prevents water infiltration at roof edges and provides a secure base for the first course of shingles.

4. Using the Calculator

Tips: Measure the total perimeter of your roof in feet. For complex roofs, sum all edge measurements. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why divide by 2 in the formula?
A: Starter strip is typically only needed along the eaves (bottom edges), which is approximately half the total perimeter.

Q2: When would I need starter strip on the entire perimeter?
A: For roofs with special designs or in high-wind areas, you might need starter on all edges (use P instead of P/2).

Q3: How do I measure roof perimeter accurately?
A: Measure each side of the roof and sum them. For complex roofs, break down into rectangular sections.

Q4: What's the standard width of starter strip?
A: Typically 6-12 inches wide, but this calculation gives linear feet regardless of width.

Q5: Should I add extra for waste?
A: Yes, consider adding 5-10% to the calculated length for cutting and overlapping at corners.