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Regulatory notice compliant fire resistant wooden exterior wall

Ministry of Construction Public Notice No. 1399 dated May 30, 2000 as amended by Ministry of Land, Infrastructure, and Transport Public Notice No. 861 dated August 22, 2014
  • In 2014, the Ministry of Construction Public Notice No. 1399 (In Regard to Establishing Construction Methods for Fire-Resistant Structures) was partially amended, therefore making it possible to build regulatory notice compliant fire-resistant wooden structure (partition wall and exterior wall).
  • In the same regulatory notice, it is stipulated that “Both sides of wooden wall framing* shall have at least two layers of fire-resistant gypsum board and a thickness of at least 42mm”, therefore Tiger Board Type Z and Tiger Board Type Z-WR can be used as fire-resistant gypsum board.
    *In the regulatory notice, steel-based wall framing is also allowed.
    • ・Fireproof cladding for outdoor-facing side: Tiger Board Type Z-WR
    • ・Fireproof cladding for indoor-facing side: Tiger Board Type Z
      (For more details, please refer to “Important Points in Ministry of Land, Infrastructure, and Transport Public Notice No. 861 of 2014” in the following page)
  • In the regulatory notice, it allows for 5 types of exterior cover material.
    (Ceramics-based siding, lightweight foam concrete panel, metal plate, mortar coating, and plaster coating)
Horizontal sectional view
  • * Ventilation construction method is required.
  • * Please attach the moisture permeable waterproof sheet within 2 weeks after the start of Tiger Board Type Z-WR installation.
  • * Please avoid installation work for the outdoor side during rainy weather.
Introduction of partition wall for regulatory notice compliant fire resistant wooden structure
A simple structure lined with two layers of Tiger Board Type Z with a thickness of 21mm at both sides.
It is also possible to inject thermal insulation material.
Horizontal sectional view
Important Points in Ministry of Land, Infrastructure, and Transport Public Notice No. 861 of 2014
【Excerpts on technical advices】
  • 2.Matters to note in checking the construction
  • (abbreviated)
  • (1)In regard to checking the conformity of fireproof cladding
    Fireproof cladding in this Public Notice is limited to those of fire-resistant gypsum boards where the content of parts excluding the paper liner for the board, namely gypsum, glass fiber and vermiculite, is over a certain level. Among the materials certified by the Minister of Land, Infrastructure, Transport and Tourism as non-combustible materials so far, the following are applicable.
  • ①Among NM-8615 “Fire-resistant gypsum board”: GB-F(V) (with vermiculite)
  • ②Among NM-1498 “double-sided chemical-treated board paper liner/gypsum board”: those which gypsum, glass fiber, and vermiculite contents conform to the standard*1 ※1
  • In addition, in regard to A and other products, please peruse composition tables, etc., to check the conformity of the product to the specifications stipulated in this Public Notice.
  • (2)In regard to nailing or other fixture methods to fix the fireproof cladding
  • (abbreviated)
平成26年8月22日 国住指第1785号「耐火構造の構造方法を定める件の一部を改正する告示の
施行について(技術的助言)」より引用
※1
* The composition of the core material of GB-F (V) (with vermiculite) is as follows
 Gypsum: 95% or higher, vermiculite: 2.5% or higher, glass fiber: 0.4% or higher
【Excerpts on public comment】
What is your view about durability and waterproofing ability when using fire-resistant gypsum board for exterior walls?
Our point of view is that proper maintenance is necessary for fire-resistant gypsum boards used for exterior walls, and it is necessary to care for durability and waterproof ability, such as by applying waterproof and rustproof treatment. *2
Excerpted from “In regard to the result of invitation for public comments concerning the draft for Public Notice on the partial amendment of ‘In regard to the establishment of construction method for fire-resistant structures’ (Ministry of Construction Public Notice No. 1399 of 2000)” by Ministry of Land, Infrastructure, and Transport Housing Bureau Construction Guidance Section dated August 27, 2014
*2
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