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  6. Waterproof layer renovation method for achieving the long lifespan of facilities! Narlite injection method.

Waterproof layer renovation method for achieving the long lifespan of facilities! Narlite injection method.

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last updated:Dec 09, 2025

成瀬化学
成瀬化学
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Revitalize the waterproofing layer using asphalt waterproofing! Introducing a waterproofing layer renovation method that achieves the longevity of facilities.

The waterproof layer regeneration method "Narlight Injection Method" is a technique that creates a waterproof membrane between the pressure layer and the slab concrete without removing the pressure layer. By injecting a special resin into the gaps between the pressure concrete and the waterproof layer, as well as between the slab and the waterproof layer, it blocks the pathways for water intrusion and cracks in the structure, thereby regenerating the deteriorated waterproof layer to a sound condition. The asphalt waterproof layer adopted during construction remains in good condition even after 30 years, and there is still ample potential for its continued use. Additionally, under the protective specifications of asphalt waterproofing, the injected special resin is shielded from UV rays and heat by the protective layer, allowing for long-term durability. The Narlight Injection Method addresses the above challenges, enabling a reduction in the frequency of lifetime renovations, a decrease in CO2 emissions, and a reduction in running costs. *For more details, please download the materials or contact us.

    Waterproofing work
2校_1215_narusekagaku_560_560_113202.png

Waterproof layer renovation method for achieving the long lifespan of facilities! Narlite injection method.

2校_1215_narusekagaku_560_560_113202.png
2校_1215_narusekagaku_560_560_113202.png
  • Related Link - https://naruphalt.com/products/waterproof_into/ind…
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The technical document for [PDF Download] is a digest version. If you would like the complete version of the document, we can send it by mail, so please feel free to [contact us].

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Applications/Examples of results

[Achievements] - Hanshin Racecourse Disaster Recovery Stand - Osaka Comprehensive Building Airport Facility - Osaka Stock Exchange - Kinki Postal Bureau - Elderly Welfare Foundation Yuyuu no Sato - Toyohashi Post Office - Suginami Minami Post Office - Osaka North Postal Hospital - Izumisano Post Office - Airport Facility Osaka Comprehensive Building - Okayama Prefectural Office Visitor Parking - Tenri Post Office - Kitakyushu City University Main Building E - Sapporo City Avenue Rooftop Parking - Osaka Paper and Stationery Distribution Center - Okayama Symphony Building - Ministry of Defense Building B2 - Ichigaya Government Building - Shinetsu Quartz OPT Building - Kawasaki City Central Wholesale Market Northern Market - Kumamoto North Post Office - Ministry of Defense Ichigaya Government Building and many others

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Waterproof layer renovation method to achieve the long lifespan of facilities.

Waterproof layer renovation method to achieve the long lifespan of facilities.

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[Technical Data] Mechanism of Narulight Injection Method

[Technical Data] Mechanism of Narulight Injection Method

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Risks of penetration points in existing asphalt waterproofing layer for Narulight injection.

Risks of penetration points in existing asphalt waterproofing layer for Narulight injection.

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Waterproof Layer Regeneration Method "Narlight Injection Method" Product Catalog

Waterproof Layer Regeneration Method "Narlight Injection Method" Product Catalog

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Waterproof Layer Rehabilitation Method "Narlight Injection Method" Technical Data Digest Version

Waterproof Layer Rehabilitation Method "Narlight Injection Method" Technical Data Digest Version

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[Revised April 2023] Nalfart Design and Construction Price List

[Revised April 2023] Nalfart Design and Construction Price List

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Durability of Narulight Injection - Naruse

Durability of Narulight Injection - Naruse

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Company information

成瀬化学

成瀬化学

Building materials, supplies and fixtures manufacturers

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Naruse Chemical has been walking alongside Japan's economic growth after the first oil shock, primarily in the manufacturing and supply of waterproof adhesives for construction, based on its independently invented "Atactic Polypropylene Water-based Emulsion" (Patent No. 925268). However, after the collapse of the bubble economy, Naruse Chemical is also facing a time of transformation amid the rapidly changing political and economic structure of Japan. We are now striving to respond to the diversifying needs not only in the construction sector but also in various fields such as marine, greening, and environmental issues, while aiming to transform into a high-tech company. We are confident that the existence value of "Technology of Naruse Chemical" lies in our ability to supply products that meet the demands of society and contribute to it.

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