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With its porosity, our Kawarakabe can moderate room humidity,while its clay-like appearance can be pleasing to the eye. Aggregates made from roof tiles can add unique expressions to the wall.


The walling materials we produce are eco and human-friendly. Kawarakabe can moderate humidity with its porosity, while creating a more comfortable room environment. In addition, we utilize recycled roof tiles, which can reduce CO2 emission even when used in newly-built or remodeled houses.

We highly recommend using Kawarakabe, which combines beautiful design, high functionality, and eco-friendliness.


Kawarakabe is a unique product recycled from roof tiles discarded when demolishing buildings or replacing roof tops. Clay roof tiles are fired in the range 1,100 to 1,300℃, hardened and porous ceramic. By utilizing these tiles as walling materials, we can produce products with a lot of advantages.

■Major Advantages■

1 Recycling can be encouraged, leading to reduced CO2 emission.

2 High functionality.

3 No releasing of formaldehyde.

4 Beautiful design.

Attractive plastering materials【Kawarakabe】with unique design and high functionality.

Recycling can be encouraged, leading to reduced CO2 emissions.

Aggregate (sand type) used in Kawarakabe is all made from discarded roof tiles collected when demolishing private houses, for instance. This aggregate is carefully manufactured in our factory (approved by ISO9000) under strict quality control.
Since Kawarakabe utilizes recycled roof tiles as aggregate, 1,000 kg of it can reduce 7.13kg of CO2 emission (approximately 37g / ㎡) in comparison with normal new plastering products. *5 kg of the aggregate is used in 1㎡ of our Kawarakabe. It is also easy to install because it can be directly applied to plaster board or wallpaper.


Functions of Kawarakabe (High functional plastering material)

Kawarakabe has amazingly high functionality.

1、Data for Moisture Absorption and Desorption


This graph shows that Kawarakabe releases and absorbs as much or more moisture as diatomite, which proves its suitability as plastering material. When the humidity is RH100% (See bottom left of the graph), roof tiles absorb more moisture than other materials. As the humidity nears RH80% (Also see the center of the graph), they release a lot of moisture. This explains the roof tiles’ high functionality. *The original data has been collected in The Industrial Research Institute of Ishikawa and converted into tons per cubic meter (kg/m3).


 2、Data for Thermal Conductivity




 Thermal conductivity is approximately 70% lower than mortar, showing Kawarakabe is highly suitable for walling.


3、Pictures of Aggregate Made from Roof Tiles / Enhanced Images with Electronic Magnifier


We mainly use this (aggregate made from roof tiles) for Kawarakabe.


The black dot in the center is a glazed piece of recycled roof tile. When these glazed parts are included in the plastering material, they create unique expressions.



The Surface of Aggregate(×100)

The Surface of Aggregate(×2,000)


Pictures taken by electronic magnifier. You can see the porous surfaces.




4、Other Data


Test Results by Japanese Industrial Standards(A 6909)

Test List

Required Standards by Japanese Industrial Standards
Test Results

Crack Resistance (During Initial Dryness)

No Crack

Stability Under Low Temperature

No coagulation and separation

Bond Strength

Tested Under Normal Condition 0.3 and above

Resistance Under Repeated Temperature Changes ( High and Low Temperature)

No peeling off, cracks or swelling on the tested surface. No major fading or gloss loss.

Impact Resistance

No cracks, major deformation or peeling off


No exposure of the original surface by peeling off or abrasion

Alkaline Resistance

No cracks, swelling, peeling off or dissolution. 

No major fading or cloudiness


Color Fading Resistance

No cracks or peeling off. Gray scale 3 and above.
 ※1 Excluded because the test does not allow testing under the temperature of 3℃ or under, and leaving of the mixed materials for over 40 minutes.



No releasing of formaldehyde(Analytical result)

Beautiful Designs

Kawarakabe can be plastered with the thickness of 4-5mm, and therefore a variety of surface patterns are available. Kawarakabe also comes in various colors.

1、Finish Patterns(Examples) 

Metal Trowel

Trowel(Wave Pattern)




Notched Trowel

Water Jet(with BiggerAggregate)

Brush Coating

Comb Trowel

Brush Coating
(with Straw)

Wood Trowel


2、Color Types


Ama-Iro Color


Kitsurubami-Iro Color

Kurumi-Iro Color

Araishu-Iro Color


JAnzuiro-Iro Color


Chozya-Iro Color

Ko-Iro Color

Rakuda-Iro Color


Every effort is of course made to ensure that the samples supplied correspond as closely as possible to the colours of our products, however, variations in colour may occur. Please feel free to ask for our sample brochure, and confirm the color you would like.

Click here for our sample brochure.


『Kawarakabe』Selling Agency



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