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Douglas fir tongue and groove 400cm (10/21x165mm)
SKU 17115400
Features Douglas fir tongue and groove 400cm (10/21x165mm):
+ Size: 1.0 / 2.1x16.5x400cm
+ Long service life, 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 400cm (10/21x165mm)
The Douglas Fir Tongue and Groove 400cm (10/21x165mm) is a high-quality softwood cladding board known for its strength, durability and attractive natural grain. Douglas fir is widely used in construction thanks to its excellent structural performance and stability, making it suitable for both functional and decorative timber applications.
With a length of 4000mm and a profiled thickness of 10/21mm combined with a width of 165mm, these boards offer a versatile cladding solution for a wide range of exterior and interior projects.
Key Benefits
- Strong and durable Douglas fir softwood.
- Attractive natural grain and warm appearance.
- Reliable tongue and groove connection for a tight fit.
- Suitable for structural and decorative use.
- Stable timber with good long-term performance.
- Easy to machine, treat and finish.
- Suitable for indoor and outdoor applications.
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
- General timber construction
Specifications
| Material | Douglas fir softwood |
| Profile | Tongue and groove |
| Length | 4000 mm |
| Thickness | 10/21 mm |
| Width | 165 mm |
| Application | Interior and exterior cladding |
Installation
Install the boards on a straight and ventilated timber framework to ensure optimal performance. Maintain sufficient airflow behind the cladding and use stainless steel or galvanised fixings to prevent corrosion and staining. Always treat cut ends before installation.
Maintenance
Douglas fir is naturally strong but benefits from regular maintenance. Apply paint, stain or wood preservative to protect against moisture, UV exposure and weathering. Without treatment, the wood will naturally develop a silver-grey patina over time.
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 adequate airflow behind the cladding.
- Start installation from the bottom upwards.
- Connect boards using the tongue and groove system.
- Fix with stainless steel or galvanised screws.
- Treat all cut ends before installation.
- Apply protective finish if required.
Frequently Asked Questions
Is Douglas fir suitable for outdoor use?
Yes. It is suitable for exterior cladding when properly installed and maintained.
Can it be painted or stained?
Yes. Douglas fir accepts paint, stain and protective coatings very well.
What does 10/21mm thickness mean?
This refers to the profiled thickness of the board, 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 applications.
Which fixings should be used?
Stainless steel or galvanised fixings are recommended for long-term durability and corrosion resistance.
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