Description
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 you’d 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 façades, 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) -
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: 5–10%
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, façades, 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 isn’t 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 50–60+ 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 it’s 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 5–10% 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.
Payment & Security
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Request Samples
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Some of Our Service Reviews
This company deserves more than 5 stars
This company deserves more than 5 stars! Brilliant help & communication by the staff there. My purchase was delivered the next day. can't fault them at all. Thank you
Date of experience: 21 February 2024
Made up with the cladding and…
Made up with the cladding and corrugated roof sheets
Delivered early which was a bonus
All the sheets were not damaged
And l must say cheapest around
Spot on
Will defo use again
Date of experience: 17 October 2023
Cladding
Very pleased with my grey composite cladding. Staff helpful, free samples received, confirming a good product at a fair price, leading to my purchase.
Date of experience: 11 June 2023
Help with my new garage roof!
Trade Warehouse could not have been more helpful. They very patiently guided a roofing newbie through all of the stuff I would need to do the job and provided helpful tips along the way. It's rare to find a company offering such a fantastic level of customer service as standard. I would highly recommend them and will certainly use them again.
Date of experience: 23 August 2023
Garden Storage
My contractor (Charlie Keep) recommended you to me so I could order the materials online for delivery direct to my home. These were for a project to construct a Garden Storage Area. The materials were perfect and the whole process was simple and slick with materials delivered on time and very well packaged. Charlie has since completed the project & I am very happy with the outcome.
Date of experience: 20 August 2023
Right product, right price, right delivery.
Right product, right price, right delivery. Sure, it was only one length of cast iron guttering but they took the order seriously, packed it well and kept me updated on delivery. And when I opened the very good packaging I found it was exactly what I had wanted. How can you do better!!
Date of experience: 31 January 2023
Fast
Fast , efficient service
Date of experience: 12 September 2023
It was exactly what I wanted
It was exactly what I wanted. Arrived in good order
Perfect
Date of experience: 16 September 2023
Straight forward and helpful with…
Straight forward and helpful with making the order. Delivery guy was friendly and was helpful in bringing the sheets into the back yard (was only a few). Really happy and would highly recommend!!!
Date of experience: 27 August 2023
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