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Douglas fir tongue and groove 350cm (10/21x165mm)
SKU 17115350
Features Douglas fir tongue and groove 350cm (10/21x165mm):
+ Size: 1.0 / 2.1x16.5x350cm
+ Long lifespan, is one of the hardest European coniferous woods
+ Available in various lengths, widths and thicknesses
+ Color: blank, also available in black
+ Douglas is durable and does not need to be pressure impregnated with heavy metals unlike pine or spruce
+ FSC and PEFC certified from responsible forest management
+ Treat with fungus protection
+ Working 15cm width
+ Warm appearance
Delivery in 5-21 days
Product description
Douglas Fir Tongue and Groove 350cm (10/21x165mm)
The Douglas Fir Tongue and Groove 350cm (10/21x165mm) is a strong and durable softwood cladding board valued for its structural performance and attractive natural appearance. Douglas fir is widely used in construction due to its excellent strength-to-weight ratio, making it suitable for both decorative and functional timber applications.
With a length of 3500mm and a profiled thickness of 10/21mm combined with a width of 165mm, these boards provide a reliable and versatile cladding solution for both exterior and interior projects.
Key Benefits
- High-strength Douglas fir softwood.
- Attractive natural grain and warm appearance.
- Strong tongue and groove connection for a tight fit.
- Suitable for structural and decorative applications.
- Stable and durable timber species.
- Easy to machine, treat and finish.
- Suitable for indoor and outdoor use.
Applications
This Douglas fir tongue and groove cladding is suitable for a wide range of projects, including:
- Facade cladding
- Garden sheds
- Summer houses
- Garden rooms
- Cabins
- Exterior wall cladding
- Interior feature walls
- Timber construction projects
Specifications
| Material | Douglas fir softwood |
| Profile | Tongue and groove |
| Length | 3500 mm |
| Thickness | 10/21 mm |
| Width | 165 mm |
| Application | Interior and exterior cladding |
Installation
Install the boards onto a straight and ventilated timber framework to ensure long-term performance. Maintain proper airflow behind the cladding and use stainless steel or galvanised fixings to prevent corrosion and staining. Treat all cut ends before installation for optimal durability.
Maintenance
Douglas fir is naturally durable but benefits from regular maintenance. Apply paint, stain or wood preservative to protect against moisture, UV exposure and weathering. Without treatment, the wood will gradually develop a natural grey patina.
Related Products
Complete your project with our decking screws and garden fencing.
How to Install Douglas Fir Tongue and Groove Cladding
- Prepare a level and ventilated timber subframe.
- Ensure sufficient airflow behind the cladding.
- Start installation from the bottom upwards.
- Connect boards using the tongue and groove system.
- Fix securely with stainless steel or galvanised screws.
- Treat all cut ends before installation.
- Apply a protective finish if required.
Frequently Asked Questions
Is Douglas fir suitable for exterior use?
Yes. Douglas fir is strong and suitable for outdoor cladding when properly installed and maintained.
Can it be painted or stained?
Yes. It accepts paint, stain and protective coatings very well.
What does 10/21mm thickness mean?
This refers to the profiled board thickness, which varies depending on the tongue and groove section.
Can it be used indoors?
Yes. It is also ideal for interior feature walls and decorative timber applications.
Which fixings should be used?
Stainless steel or galvanised fixings are recommended for long-term durability and corrosion resistance.
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