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  6. A thorough explanation of the C-value of a house where the owner personally performed airtightness treatment during construction!

A thorough explanation of the C-value of a house where the owner personally performed airtightness treatment during construction!

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last updated:Nov 19, 2025

日本住環境
日本住環境
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Interview on housing costs! We will also explain airtight performance and electricity costs of high airtight houses.

To create a house that is cool in the summer and warm in the winter, it is necessary to improve overall factors related to housing performance, such as airtightness and insulation performance. However, since improving performance incurs certain costs, many homeowners find themselves in a dilemma between housing performance and budget. According to the research conducted by the Iie no Supplement editorial team, Mr. X requested a local low-cost construction company that does not focus on airtightness due to cost considerations for his home. Knowing from the beginning that they would not prioritize airtightness, Mr. X reportedly applied airtight tape to the floors, walls, and ceilings himself during the construction process. *For more details, you can view the blog through the related link. For further information, please feel free to download the PDF or contact us.*

    Insulation work
?C値を徹底解説

A thorough explanation of the C-value of a house where the owner personally performed airtightness treatment during construction!

?C値を徹底解説 画像.png
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  • Related Link - https://www.njkk.co.jp/blog/?itemid=235&dispmid=76…
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[2025 Latest Edition] Comprehensive Catalog * "Structural Ventilation," "Air Tightness and Waterproofing Materials," and "Indoor Ventilation Materials" have been compiled into one book.

[2025 Latest Edition] Comprehensive Catalog * "Structural Ventilation," "Air Tightness and Waterproofing Materials," and "Indoor Ventilation Materials" have been compiled into one book.

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日本住環境

日本住環境

Building materials, supplies and fixtures manufacturers

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The products and services developed by our company over a quarter of a century are not visible to the people living in them. We believe that our mission at Japan Living Environment Co., Ltd. is to create a comfortable living environment for the main character of the home, "people," from behind the scenes where it is not visible.

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