Delivered within 3-4 weeks.
These 2.4m 145mm x 18mm Iroko Shadow Gap cladding boards are a premium hardwood option for striking, contemporary exterior projects. Iroko is a naturally oil-rich African hardwood, prized for its strength, stability and natural resistance to rot and insects making it ideal for outdoor use without the need for pressure treatment.
The 145mm x 18mm profile creates clean, sharp shadow lines that give buildings a modern architectural look. With a 135mm face coverage, these boards provide strong visual definition while offering reliable weather protection when installed correctly.
Freshly machined Iroko features rich golden to medium brown tones, which naturally weather to a refined silver-grey over time. If youd like to maintain the original colour for longer, we recommend applying a high-quality oil or OSMO stain, which also helps protect against moisture, UV exposure, cracking and movement.
Perfect for luxury faades, garden rooms, garden offices, outbuildings and modern extensions, Iroko Shadow Gap is a high-end cladding solution that combines premium looks with long-term performance.
Product Specifications
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Material: Iroko
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Minimum Order: 100 linear metres
(Orders under this will be cancelled due to machining requirements. Any quantity available in British Cedar, British Larch or Treated Redwood)
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Width: 145mm
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Thickness: 18mm
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Face Coverage: 135mm
- Board Length: 2.4m
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Finish: Planed Timber
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Type: Hardwood
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Origin: Africa
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Durability Class: Class 2
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Movement Class: Low
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Knots: Few
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Colour: Golden to medium brown, weathering to soft silver-grey
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Modified Timber: No
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Fixings: Stainless Steel recommended
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Treatment: Untreated (OSMO oil or stain recommended)
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Available Lengths: 0.9m, 1.2m, 1.8m, 2.4m, 3.0m, 3.6m, 3.9m and 4.2m
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Recommended Wastage: 510%
Key Features & Benefits
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Premium African hardwood
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Modern shadow gap profile for clean architectural lines
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Naturally resistant to rot and insects
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Dense, strong timber with excellent stability
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Low movement for long-term performance
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Smooth planed finish
Alternative Cladding Options
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British Larch Cladding UK-grown softwood option
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Iroko Loglap Profiled hardwood alternative
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Iroko 6 x 1 Boards Square edge option
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Thermowood Cladding Heat-treated softwood alternative
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European Larch T&G Softwood profiled option
Frequently Asked Questions (FAQs)
1. What are shadow gap boards typically used for?
Shadow gap boards are mainly used for modern exterior cladding on garden rooms, faades, sheds and architectural feature walls.
2. Is Iroko suitable for external use?
Yes, Iroko is naturally resistant to rot, moisture and insect attack, making it ideal for outdoor environments.
3. Do I need to treat Iroko shadow gap cladding?
Treatment isnt required, but using a wood oil or OSMO stain helps preserve colour and enhances surface protection.
4. How long does Iroko cladding last?
With correct installation and maintenance, Iroko cladding can last 5060+ years.
5. What fixings should I use?
Always use stainless steel nails or screws to avoid corrosion and staining.
6. Can this cladding be used internally?
It can be used internally, but its designed primarily for external applications.
7. Do you offer bespoke lengths?
Yes. Contact us.
8. Does Iroko move or warp over time?
Iroko has low movement, making it very stable compared to most softwoods.
9. How much wastage should I allow?
We recommend allowing 510% extra material for cuts and trimming.
10. How do I install Iroko shadow gap cladding?
We provide detailed Cladding Install Guides with step-by-step fitting instructions.
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