1. What is a Paving Slab Calculator B&Q?

Definition: This calculator estimates the number of mortar bags needed for laying paving slabs based on area, bedding depth, mortar ratio, and yield.

Purpose: It helps DIYers and landscapers determine how much mortar is required for paving projects, particularly when using B&Q materials.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( M \) — Mortar bags needed
• \( A \) — Area to cover (square feet)
• \( D \) — Bedding depth (inches, converted to feet)
• \( R \) — Mortar ratio (unitless)
• \( Y \) — Yield per bag (cubic feet per bag)

Explanation: The area multiplied by depth (converted to feet) gives volume, adjusted by mortar ratio, then divided by bag yield.

3. Importance of Mortar Calculation

Details: Proper mortar estimation ensures stable paving installations, prevents material waste, and helps with project budgeting.

4. Using the Calculator

Tips: Enter the area in square feet, bedding depth (default 1.5 inches), mortar ratio (default 1.2), and yield (default 2.5 ft³/bag). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical bedding depth for paving slabs?
A: Most paving slabs require 1-2 inches of mortar bedding, with 1.5 inches being common for standard installations.

Q2: What mortar ratio should I use?
A: A ratio of 1.2 is standard for most paving projects, but consult your specific mortar product instructions.

Q3: How do I find the yield of my mortar?
A: Check the product packaging - most standard mortar yields about 2.5 cubic feet per bag when mixed.

Q4: Does this include joints between slabs?
A: No, this calculates bedding mortar only. Add 10-15% more for joint filling if needed.

Q5: How accurate is this calculation?
A: It provides a good estimate, but always buy 10% extra to account for variations in application and potential waste.