Shiplap vs Tongue & Groove
Whats the Difference?
Reading Time: 4-5 minutes
Choosing the right timber cladding for your project can be a challenge with so many options available. Two of the most popular choices are Shiplap and Tongue & Groove, but how do you know which is best for your needs? In this blog, we’ll break down the key differences between these two cladding types, highlight their benefits, and provide expert tips on the best ways to fix them. By the end, you’ll have all the information you need to make an informed decision.
What is Shiplap Cladding?
Shiplap cladding is a type of wooden board with an overlapping profile that creates a tight seal against the elements. The defining feature of shiplap is its rabbeted edges, which allow each board to overlap the next, providing a distinctive shadow line effect and excellent weather resistance.
Benefits of Shiplap:
- Superior Weather Resistance: The overlapping design effectively sheds water, making it ideal for external applications such as sheds, summerhouses, and garden offices.
- Rustic Aesthetic: Shiplap provides a classic, rustic appearance that works well in traditional and modern settings.
- Easy to Install: The overlapping boards make it relatively easy to install with minimal gaps.
- Enhanced Ventilation: The design allows for slight expansion and contraction with changes in temperature and humidity.

What is Tongue & Groove Cladding?
Tongue & Groove (T&G) cladding features boards that interlock through a tongue on one side and a groove on the other. This design provides a seamless, tight fit that creates a smooth, uniform surface.
Benefits of Tongue & Groove:
- Sleek, Modern Finish: T&G boards fit tightly together, creating a seamless, smooth appearance that works well for interiors and exteriors.
- Increased Strength: The interlocking design enhances the structural integrity of the cladding, making it less prone to warping.
- Better Insulation: The tight joints help with insulation, making it a popular choice for interior walls and ceilings.
- Minimal Water Ingress: Provides excellent protection against moisture ingress, making it suitable for areas exposed to the elements.

Key Differences Between Shiplap and Tongue & Groove
Feature | Shiplap | Tongue & Groove |
Installation | Overlapping boards | Interlocking boards |
Appearance | Rustic with shadow lines | Smooth and seamless |
Weatherproofing | High | Excellent |
Best Use | Exterior cladding, sheds | Interiors, garden buildings |
Ease of Repair | Easier to replace single boards | Requires careful disassembly |
Best Fixing Methods for Shiplap and Tongue & Groove
Regardless of whether you choose shiplap or tongue & groove, proper installation is key to longevity and performance. Here are some best practices for fixing each type:
Fixing Shiplap Cladding:
- Nailing or Screwing: Fix through the overlap section to conceal fasteners and maintain a clean look.
- Allow for Expansion: Leave small gaps at the ends to accommodate timber movement.
- Horizontal Installation: Ensure boards are slightly angled to aid water runoff.
Fixing Tongue & Groove Cladding:
- Secret Nailing: Insert nails into the tongue to hide them when the next board is installed.
- Glue for Interior Use: Consider adhesive for additional strength, particularly indoors.
Expansion Gaps: Leave a small gap at the edges to allow for natural wood movement.
Which One Should You Choose?
- If you’re looking for a traditional, weather-resistant option, shiplap is the way to go.
- If you prefer a sleek, modern finish with added strength, tongue & groove might be the better choice.
Still unsure which is best for your project? Contact us today for expert advice and quality timber products to suit your needs.
Disclaimer: The content provided on this page is designed to serve as a general overview and should not be considered professional advice. While Dorchester Timber strives to ensure accuracy, we accept no responsibility for any outdated or inaccurate information presented here.