Size & Thickness Guide
Choosing the correct paving slab size and thickness is essential for creating a durable, long-lasting outdoor surface. At Paving and Slabs Ltd, this guide explains how to select the right slab specifications for patios, pathways, and landscaped outdoor areas across the UK.
Why Size & Thickness Matter
The performance of paving slabs depends heavily on their dimensions. Incorrect slab thickness can lead to cracking, movement, or uneven surfaces over time. Size selection also affects the overall appearance, installation method, and long-term maintenance of your paving.
Common Paving Slab Sizes in the UK
Paving slabs are available in a range of standard sizes to suit different outdoor applications. Popular slab sizes include:
- 600 x 600mm – ideal for modern patios and open garden spaces
- 900 x 600mm – commonly used for contemporary paving layouts
- 600 x 300mm – suitable for pathways and smaller patio areas
- Mixed-size packs – often used for traditional and random paving patterns
Recommended Slab Thickness by Application
Slab thickness should always be selected based on how the area will be used. Below are general UK guidelines:
- 18–22mm: Suitable for patios and light pedestrian use
- 22–25mm: Recommended for garden paths and regular foot traffic
- 30mm+: Required for driveways and commercial applications
Natural Stone vs Porcelain Thickness
Natural stone paving, such as Indian sandstone, often varies slightly in thickness, which is normal and expected. Porcelain paving slabs, on the other hand, are precision-manufactured and typically supplied in consistent thicknesses, commonly 20mm for outdoor use.
Installation Considerations
Slab thickness directly affects the installation method. Thicker slabs generally require a stronger sub-base and full mortar bed installation to ensure stability. Proper preparation helps prevent movement, sinking, and water pooling.
For best results, thickness selection should be considered alongside drainage, ground conditions, and intended use.
Expert Guidance from Paving and Slabs Ltd
Our team provides professional guidance to help customers choose the correct paving slab size and thickness for their specific project. Whether you are planning a garden patio, pathway, or larger landscaping project, selecting the right slab specifications ensures long-term performance and visual appeal.