国土交通省該� �ページ.pdf

Ministry of Land, Infrastructure, Transport and Tourism
From January 1, 2022,
the tightening method of tile roofs will be strengthened.
When building a new building after January 1, 2022,
countermeasures against strong winds for tile roofs will be required.
～Revision of the notification standards of the Building Standards Law (Ministry of Construction Notification No. 109, 1971)～
Damage to buildings (roofs) due to strong winds from the typhoon in the Boso Peninsula in 2019
Damage to hira-ita
Damage to mune
Damage to nokigiri and keraba
Overview of the pre-revision notification standards
(Showa 46, Building Notification No. 109)
Standard design and construction guidelines for tile roofs
(Guideline method)
Summary
• Notification standards based on the Building Standards Law
• Standards that are mandatory for all buildings
• Same standards since 1956
• Guidelines without legal binding force by industry organizations
• Supervised by the Building Research Institute (Kenken)
• Established in August 2001, and widely used in recent new residential construction
Tightening parts
Nokigiri and keraba (tiles from the edge to 2 tiles)
Mune (every other tile)
In principle, all tiles
Tightening method
Nokigiri and keraba
Tightened with copper wire, iron wire, or nails
Tightened with screws and 2 nails
Mune
Tightened with copper wire, iron wire, or nails
Tightened with screws
Hira-ita
No regulation
Tightened with nails, etc.
Overview of pre-revision strong wind countermeasures (technical standards of the Building Standards Law)