Shou Sugi Ban Charred Wood Products
Kiertopuu®️ – Upcycled Residual Wood with Shou Sugi Ban Charred Surface
Kiertopuu®️ is a Finnish Circular Economy Product
Kiertopuu® products are made from residual wood or inferior quality wood generated by the sawmill, planing, and construction industries. The material is mainly Finnish spruce, originally having bruises, poor knot quality, color defects, or not suitable for structural use according to its strength classification. However, this material can be cleaned by charring its surface and repurposed for use as cladding material. If it is not used for cladding, it is often burned for energy.
In the charring process, we use Finnish biogas instead of fossil fuels.
Shou Sugi Ban / Yakisugi: Wood Surface Treatment by Burning
The idea of wood surface treatment and protection through burning originates from Japan, where the method is known as shou sugi ban (also yakisugi). In English, we talk about wood surface charring.
Burning the wood’s surface removes sugars and organic matter from the wood, and it seals the wood’s pores. This treatment:
- Improves the wood’s weather resistance
- Cleans the wood’s surface
- Offers a non-toxic way to protect the wood
- Doesn’t weaken the wood’s internal structure
- Doesn’t smudge when the wood surface is washed, brushed, or oiled after charring
Surface Treatment Options for Kiertopuu®️ Products
Charred
Charred surface wood gives cladding a rugged ambiance. Wood with a charred surface is always oiled to prevent smudging.
Washed
The charred wood material can also be washed with a pressure washer, resulting in a smoother dark surface.
Brushed
Brushing removes even more of the soot and charcoal from the charred wood surface, leaving a beautiful dark hue and a silky smooth surface.
Colored
The charred and brushed or washed surface can also be colored to achieve the desired color shade.
Information about Charred Kiertopuu®️ Products
From the table below, you can find the main forms, dimensions, and use cases for Kiertopuu®️ products, which are available in lengths ranging from 1000 – 6000 mm depending on the available raw material.
| FORM | DIMENSIONS | USE CASES |
| panel | 22 x 50-250 28 x 50-250 | interior cladding exterior cladding |
| board | 16-28 x 64-250 | fences, structures, docks, terraces |
| plank | 44 x 64-244 | terraces, railings, docks |
| beam | 50-200 x 50-200 | posts, railings, docks |
Ordinary Sawn Timber Charred with Biogas
Any type of wood can be surface-charred with our method. Should the need arise for a more specialized material or dimension, please contact us. We also char new wood ecologically with biogas as needed.
Wood Surface Charring as a Service
We also offer wood charring as a service to wood industry operators. This charring is also done more ecologically with biogas. For more information, please contact us.
Request a Quote
To request a quote for Kiertopuu products or other surface-charred woods, fill out the form. You can also email the requested information to sales@hiil.fi.
Our staff will reply with a quote, shipping costs, and possible delivery time or ask additional questions about your needs.