Is CLS Timber Treated?
CLS timber, short for Canadian Lumber Standard, is one of the most popular materials in construction, prized for its durability, smooth finish and versatility. Whether you’re building internal walls, framing or partitions, CLS timber provides a reliable and professional result every time.
A common question arises: is CLS timber treated? The answer depends on its intended use, as CLS timber is available in both treated and untreated forms, each suited to specific environments and applications.
In this guide, we’ll explore what CLS timber is, the differences between treated and untreated versions and how to choose the right type for your project.
What Is CLS Timber?
CLS timber, or Canadian Lumber Standard timber, is a kiln-dried, softwood product commonly made from species like spruce, pine or fir. It is specially planed on all four sides with rounded edges, making it easy to handle and safe to work with during construction.
This versatile timber is widely used for internal projects, such as stud walls, partitions and framing, due to its consistent quality and dimensional stability. Its smooth, uniform finish also makes it suitable for DIY projects where precision is important.
CLS timber is available in various sizes, typically cut to match the most common requirements in construction. Its lightweight and easy-to-work-with nature make it a go-to choice for both professionals and DIY enthusiasts.
Treated vs. Untreated CLS Timber
When it comes to CLS timber, one of the key considerations is whether it’s treated or untreated. Both options have their advantages and are suited to specific applications, depending on the environment in which the timber will be used.
Treated CLS Timber
Treated CLS timber undergoes a pressure treatment process where preservatives are infused into the wood to protect it from moisture, rot and insect damage. This makes it a reliable choice for projects in damp or outdoor environments, such as garden structures, external walls or areas exposed to higher levels of humidity. The added treatment enhances its durability, ensuring it can withstand harsher conditions over time.
Untreated CLS Timber
Untreated CLS timber, on the other hand, is a more cost-effective option for indoor projects where exposure to moisture is minimal. It is commonly used for constructing internal stud walls, framing and partitions. Without the additional chemical treatment, untreated timber is ideal for applications where no added resistance to the elements is required.
At MSS Timber, our CLS timber is supplied untreated, making it a perfect choice for indoor applications like stud walls and framing. For treated timber options, check our collection of Treated Timber here.
Choosing between treated and untreated CLS timber depends on the specific requirements of your project. For internal work, untreated timber is often sufficient, while treated timber is recommended for outdoor or moisture-prone areas.
Advantages of CLS Timber
1. Versatility
CLS timber is suitable for a range of indoor construction tasks, including stud walls, partitions and framing. Its uniform dimensions and smooth planed finish make it ideal for creating strong, precise structures that fit together seamlessly.
2. Ease of Use
The smooth surface and rounded edges of CLS timber make it easy to handle and install. It’s lightweight yet durable, ensuring a simple construction process without compromising on strength or quality.
3. Cost-Effectiveness
Compared to other timber options, CLS timber offers an affordable solution for projects requiring reliable materials. Untreated versions are particularly budget-friendly, especially for indoor uses like framing and internal walls.
4. Sustainability
CLS timber is sourced from fast-growing, renewable softwood species, making it an eco-friendly choice for construction. When sourced from responsible suppliers, it contributes to sustainable forestry practices.
5. Dimensional Stability
Kiln-dried during production, CLS timber maintains consistent moisture levels, reducing the risk of warping or shrinking over time. This makes it a dependable material for long-lasting results.
These advantages make CLS timber a go-to choice for a variety of construction and DIY projects, offering both functionality and value.
Tips for Using CLS Timber
To get the most out of CLS timber, it’s important to understand how to handle and use it effectively for your construction project. Here are some practical tips to ensure a successful build:
1. Match the Timber to Your Project Needs
For indoor projects, untreated CLS timber is a reliable and cost-effective choice. Use it for internal stud walls, partitions and framing where moisture exposure is minimal.
For outdoor projects, treated CLS timber is recommended to protect against moisture, rot, and insect damage. If untreated timber is used outdoors, ensure it is sealed or treated after installation.
2. Store It Properly
To prevent warping or damage, store CLS timber in a dry, covered area. Ensure it is raised off the ground and protected from moisture before use.
3. Leave Expansion Gaps
When working with CLS timber, particularly in framing or partitioning, leave small gaps to account for natural expansion and contraction. This ensures the timber remains stable and avoids unnecessary stress on the structure.
4. Use the Right Tools and Fixings
CLS timber’s smooth planed finish makes it easy to cut and fasten. Use sharp saws and appropriate screws or nails to maintain a clean, professional finish during installation.
5. Apply Finishes Where Necessary
Untreated CLS timber offers flexibility in finishing. For indoor projects, you can paint, varnish or stain the timber to match your design preferences and protect it from wear and tear.
By following these tips, you can ensure that your CLS timber project is durable, stable and meets your expectations.
Buy CLS Timber from MSS Timber
CLS timber is a versatile, reliable material for a wide range of construction projects, whether treated for outdoor durability or left untreated for indoor use. At MSS Timber, we supply high-quality untreated CLS timber, perfect for internal applications like stud walls and framing.
Ready to get started? Visit our CLS Timber page today to explore our range and find the right materials for your next project!