Timber Choices: Comparison Between C16 and C24 - Discovering Their Distinctions and Suitability for Your Construction Endeavor

In the world of timber construction, two common strength grades stand out: C16 and C24. While visually, there may be little difference between the two, their properties and applications differ significantly.

Established in 1924, English Brothers, a renowned company manufacturing bespoke timber frames, has been catering exclusively to self-builders for nearly a century. Over the years, they have witnessed the creation of their 1,000th one-off timber frame kit, a testament to their commitment to quality and craftsmanship.

The grading of timber is crucial in determining its usage on a project. Factors such as size and frequency of knots, splits, density, and grain direction all play a role in this process. Today, machine grading is the most common method, using machines to measure stiffness, density, and elasticity of timber.

C16 and C24 are strength classes of structural timber. C16, typically used for interior dry environments such as indoor stair structures, is more prevalent and cheaper due to its lesser strength requirement. On the other hand, C24, being stronger and more durable, is preferred for outdoor or load-bearing applications where greater resistance is required.

C16 is not suitable for joists or rafters due to its limited strength. It is, however, commonly used for framing walls as studs, including non-load bearing ones. C24 timber, on the other hand, is an ideal choice for floor joists and roof rafters due to its strength. It can also be used for decking joists if properly treated.

One of the biggest giveaways between C16 and C24 timber is that they will be stamped with either C16 or C24. C24 is more expensive due to less timber passing the grading test.

For self-builders and home extensions, C24 is a more likely choice due to its strength and suitability for more demanding applications. It is rarely used for wall studs unless specifically requested by the building designer or structural engineer.

In conclusion, understanding the differences between C16 and C24 timber grades is essential for any self-builder or homeowner embarking on a construction project. By making informed decisions about the timber used, one can ensure the safety, durability, and longevity of their building.

Timber Choices: Comparison Between C16 and C24 - Discovering Their Distinctions and Suitability for Your Construction Endeavor