Pika Pika double brushed Yakisugi Image

Pika-Pika

The DOUBLE BRUSHED Yakisugi

Pika-Pika is created by running the product through a second wire brushing process that removes all loose soot from the softer spring growth rings and leaves the late wood as contrasting burnt ridges. It is a topographical, textured surface that follows the wood grain, and goes through an additional hand-grading to achieve a consistent blend of heartwood and sapwood lot to lot. Pika-Pika must have an oil prefinish applied to prevent sooty fingerprints during installation, and we have traditional oil as well as water-based natural oil options.

1. Available profiles and widths

Shiplap profile
145 mm (135 mm reveal) – #P14

Specification and profile drawing Shiplap

Square Edge profile
89 mm – #P08

Gendai profile picture

Square Edge profile
145 mm – #P04

Specification drawing Square Edge 2

Square Edge profile
195 mm – #P09

Specification drawing Square Edge

2. Available coatings and colours

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Pika-Pika - double brushed Yakisugi - Specifications

Pika-Pika: “Twinkle-Twinkle”
Wire-brushed textured surface with striped pattern. Suitable for interior and exterior applications

Species

Cryptomeria japonica, an endemic Japanese Cypress species (commonly also known as "Japanese cedar") is extremely fragrant, weather and insect resistant, soft, with a low density, and high dimensional stability. It is the national tree of Japan, it is called "Sugi" in Japanese and stands for the “sugi” in Yakisugi and “Shou Sugi Ban”.

Heartwood

Graded for even mix of heartwood and sapwood, pith allowed.

Colour

Softer spring early wood growth rings have the soot layer completely removed and colour is yellow-white (sapwood) to pink-orange (heartwood). Charred ridges and subtle crevasse shadows remain on the harder late wood growth rings. Knots appear polished black. Stainable to a broad palette with stunning effect.

Checks

Checks allowed to 2 mm as long as plank stability, weather-resistance, and cosmetics are not adversely affected.

Moisture Content

Air and sundried, then burnt to 11~14% moisture content. Moisture content may fluctuate according to conditions during transport or warehousing. Please acclimate on site for approx. two weeks prior to installation.

Fire Resistance

Yakisugi naturally due to its charred layer shows higher resistance to fire compared to untreated timber. Additionally, exterior and interior fire-retardant treatment is available for code compliance. Currently surface treatment with B1 class performance (according to EN 13501-1).

Dimensional Stability

Culling of warped, crowned, crooked, or cupped boards is carried out during resaw, air drying, sun drying, moulding, charring, packing, and finishing operations. Since growth rings are always aligned towards the outside of the plank profile, minor cupping is common and acceptable. Cupping is not noticeable after installation, and samples will cup more than shipped product.

Texture

Deep topography, with soft early wood valleys and hard late wood ridges, typical for double brushed Yakisugi.

Knots

Premium select clear grade allows for up to 4 knots (max 10 mm tight or 5 mm loose) for planks over 2,000 mm length, but in practice knots are rare with the premium grade. Select grade double brushed Yakisugi allows for unlimited knots, including some loose knots due to species characteristics (cypress does not produce high yield of tight-knot grade like red cedar due to high tannin content and unavailability of old growth logs in volume).

Hardness

320 –510

Grain

Outside of log faces outside of plank profile to ensure weather resistance, always with flat grain centre and angled grain to edges. Planks are graded for consistent grain density and pattern, with irregular grain patterns or boards being deselected.

Finish

Pika-Pika does not technically need to be finished with an oil stain for good wood longevity since it is heat-treated, but the wood will blemish from sooty fingerprints during install if it is not prefinished. Moreover, prefinish and periodic oil reapplication will slow down colour weathering over time. There are three oil prefinish formulation options and many colours available. We use breathable, low VOC finishes derived from vegetable oil bases, and all formulations have a high transparent oxide pigment load. We only use the best oil stain formulations available on the market when it comes to beauty and colour longevity.

- Penetrating transparent and semi-transparent oil finishes will bond loose soot into the surface and show depth of grain. Soot will not come off when touched and surface is solid. Semi-transparent finishes offer a larger pigment selection than transparent. Colour will patina gradually.

- Hybrid finishes are a combination of light and drying oils and can have a water-based acrylate / PU dispersion. The light oil will penetrate and show depth of grain while the reactive drying oil will remain on the surface to protect from UV and show more pigment. Pigment load is high as an effective UV inhibitor and silicone doping sheds water while allowing the wood to breathe. The colour will stay consistent until the surface residue erodes off over time, then the colour will begin to patina gradually.