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Rough-sawn Douglas post
Untreated solid rough-sawn Douglas post, sections 100x100mm, 120x120mm and 150x150mm, lengths 200cm and 240cm, sold individually. Air dried, class 3: natural resistance outdoors above ground - apply an oil or wood saturator to limit greying and extend service life according to exposure. Light timber framing, pergola, shed, shelter - section to be chosen based on the loads and spans of your project.
Rough-Sawn Douglas Post - Sections 100x100mm to 150x150mm, Lengths 200cm and 240cm
This solid rough-sawn douglas post is a square-section piece intended for load-bearing structures: pergola, carport, garden shelter, fence, raised decking. Available in 3 sections - 100x100mm, 120x120mm, 150x150mm - and in two lengths: 200cm and 240cm. The piece is delivered untreated, ready to be protected according to its use and exposure.
Rough-sawn douglas retains its natural sawn appearance - slightly irregular texture, golden-orange hue, characteristic grain. Large sections (100mm and above) are suited to significant load-bearing structures: traditional timber framing, portal frames, agricultural barns. Air-drying preserves the wood's natural mechanical properties.
Main characteristics
| Characteristic | Value |
|---|---|
| Species | Solid douglas |
| Finish | Rough-sawn - untreated |
| Available sections | 100x100mm, 120x120mm, 150x150mm |
| Available lengths | 200cm and 240cm |
| Use class | Class 3 - natural resistance, outdoor use above direct ground contact |
| Treatment | Untreated - to be protected according to exposure |
| Drying | Air-drying - natural method |
| Cut | Sold individually |
Key points
- ✓ 3 available sections - 100x100mm, 120x120mm, 150x150mm
- ✓ 2 lengths - 200cm and 240cm, on-site cutting possible
- ✓ Solid rough-sawn douglas - class 3 - natural resistance, outdoor use above direct ground contact
- ✓ Air-dried - natural method preserving the wood's characteristics
- ✓ Untreated - to be protected according to use and exposure
- ✓ Sold individually
Which section to choose:
The choice of section depends on the post height, the load to be supported, and the spacing between posts:
- ✓ 100x100mm - small lightweight structures, single-slope carports, fences
- ✓ 120x120mm - standard pergola, garden shelter, terrace up to 3m span
- ✓ 150x150mm - heavy timber framing, portal frames, major load-bearing structures
For structures subject to significant loads (snow, wind, spans> 4m), consult a timber engineering office or a carpenter for precise sizing.
Installation tips
Never embed an untreated post directly in the ground - even class 3 douglas deteriorates rapidly when in contact with damp soil. For buried posts, use stainless steel fixing plates anchored in concrete, or opt for class 4 pressure-treated timber. For posts set on a slab, use adjustable galvanised or stainless steel post bases. Apply protection to all faces before installation, paying particular attention to cut ends.
Maintenance and protection
Saturator or exterior wood oil before installation, renewed every 2-3 years. For large sections, shrinkage cracks may be more pronounced - they do not affect structural strength. Never bury without a fixing plate or class 4 treatment.
WoodUp Tip
For large sections (120x120 and 150x150mm), plan for systematic pre-drilling before screwing to avoid splitting. Use countersunk stainless steel screws of a diameter suited to the section. To go further on sizing, consult the timber frame guide.
Good to know before buying: A rough-sawn douglas post stored outdoors can grey quickly before installation. Store it under cover or apply a protective oil coat upon receipt if installation is delayed.
Frequently asked questions
What section post for a pergola?
For a standard residential pergola (3-4m span, lightweight roof), the 120x120mm section is generally sufficient for a height of 240cm. For a pergola with a planted or heavily loaded roof, or spans> 4m, choose a larger section. If in doubt, consult a carpenter or a timber engineering office.
Can this post be buried directly?
No. An untreated post must not come into direct contact with damp soil - even class 3 douglas deteriorates in ground contact (class 4 required). Use a fixing plate anchored in concrete, or order class 4 pressure-treated timber for buried posts.
Does this post need to be treated before use?
Untreated douglas naturally resists outdoor use above ground (class 3). To slow greying, apply a saturator or exterior wood oil before installation. Renew every 2-3 years.
What is the difference between a rough-sawn and a planed post?
The rough-sawn post retains the natural sawn appearance with slightly irregular faces and nominal dimensions (e.g. 100x100mm). The planed post is machined on all 4 faces to achieve smooth surfaces and precise dimensions, slightly smaller than nominal. For visible structures, the planed finish offers a neater result. For hidden or embedded structures, rough-sawn is equivalent.
Can these posts be painted or stained?
Yes. Lightly sand the faces (80-120 grit) before application. For exterior paint, apply a primer specifically designed for resinous wood. For stain or oil, apply directly to dry wood. Planed posts offer better adhesion for finishing products.
Complementary products
Planed douglas post - same species, smooth surface
Rough-sawn douglas rafter - same species, rafter format
- Species/material
- Douglas
- Use class
- Class 3 - Above ground contact outdoors
- Delivery label
- Framework
POTDOUBRU1010200
1000 Products
3420610005122
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Dispatch within 10 days
Dispatch within 10 days when the product is in stock *.
* Except bespoke products
Dispatched within 6-8 weeks
Dispatched within 6-8 weeks for personalised and made-to-measure products.
Secure payment
Payment in 1 or 3 instalments at no extra cost. Bank transfer, cheque or PayPal
Satisfied or refunded
Satisfied or refunded if returned within 14 calendar days (Sundays and public holidays included) following delivery.
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