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Douglas fir tongue and groove 300cm (18x145mm)
SKU 17118300
Features Douglas fir tongue and groove 300cm (18x145mm):
+ Length 300cm
+ Width 145cm
+ Thickness 18mm
+ 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
Out of stock
Product description
Douglas Fir Tongue and Groove 300cm (18x145mm)
The Douglas Fir Tongue and Groove 300cm (18x145mm) is a high-quality softwood cladding board valued for its strength, stability and natural appearance. Douglas fir is widely used in construction thanks to its excellent structural performance and attractive grain, making it suitable for both functional and decorative timber applications.
With a length of 3000mm, a solid 18mm thickness and a 145mm face width, this board provides a durable and refined cladding solution ideal for smaller façades, interior walls and detailed timber work.
Key Benefits
- Strong and durable Douglas fir softwood.
- Solid 18mm thickness for added stability.
- 145mm profile for a balanced visual finish.
- Tongue and groove system for a tight, seamless fit.
- Suitable for structural and decorative applications.
- Easy to machine, treat and install.
- Suitable for interior and exterior 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 | 3000 mm |
| Thickness | 18 mm |
| Width | 145 mm |
| Application | Interior and exterior cladding |
Installation
Install the boards onto a straight and ventilated timber subframe to ensure long-term performance and durability. Maintain adequate airflow behind the cladding and use stainless steel or galvanised fixings to prevent staining and corrosion. Allow boards to acclimatise before installation for best results.
Maintenance
Douglas fir is naturally durable but benefits from protective treatment. Apply paint, stain or wood oil to protect against moisture, UV exposure and weathering. Without treatment, the wood will naturally weather to 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 straight and ventilated timber framework.
- Install a breathable membrane if required.
- Start installation from the bottom upwards.
- Connect boards using the tongue and groove system.
- Fix securely with stainless steel or galvanised screws.
- Maintain consistent alignment for a professional finish.
- Treat all cut ends before installation.
Frequently Asked Questions
Is Douglas fir suitable for exterior use?
Yes. It is suitable for outdoor cladding when properly installed and maintained.
Can it be painted or stained?
Yes. Douglas fir accepts paint, stain and protective finishes very well.
What does 18mm thickness mean?
This refers to the solid board thickness, providing extra strength compared to thinner profiles.
Can it be used indoors?
Yes. It is ideal for interior feature walls and decorative applications.
Which fixings should be used?
Use stainless steel or galvanised fixings for long-term durability and corrosion resistance.
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