Here's the text.
Evaluation of buildings using wood
Based on the purpose of "policy about promotion of use of wood in Yokohama-shi building", we establish evaluation standard about wood use of building and commend building which is recognized as having remarkable achievement.
Last Updated March 29, 2024
Policy on Promoting the Use of Wood in Yokohama City Buildings
Evaluation of Wood Use
Notice
In March 2024, we revised the outline of evaluation and commendation of excellent wood use buildings.
Target of evaluation
A building that satisfies all of the following.
- Thing built in the city (thing of plan to be built)
- Other than detached houses
- Use of legally harvested timber, etc. (planned to be used)
Method of evaluation
As shown in the following table, the evaluation of wood use is evaluated based on "quantitative evaluation" for wood use and "quality evaluation" for wood use.
Those who have a comprehensive evaluation (wood use evaluation) according to the levels of "quantitative evaluation" and "quality evaluation" are A or S.
Valuation of quantity
The evaluation of the amount of wood use is based on the value obtained by dividing the volume of wood used for building wooden buildings and wood conversion by the total area of the building. As shown in the following table, four stages from level 1 to level 4 Evaluate in
(In this case, when calculating the total area, the total area of the car garage, etc. can not be included.)
| Evaluation | Wood used |
|---|---|
| Level 4 | 0.10 m3/m2 or more |
| Level 3 | 0.05 m3/m2 or more and less than 0.10m3/m2 |
| Level 2 | 0.01 m3/m2 or more and less than 0.05 m3/m2 |
| Level 1 | 0.002 m3/m2 or more and less than 0.01 m3/m2 |
Quality Assessment
As shown in the following table, the quality of wood use is evaluated in four stages from Level I to Level IV, according to the number corresponding to the following evaluation criteria (1) to (5).
[Evaluation by Effective Use]
(1) Wood is used for parts that can be seen from the surroundings of the target building, contributing to the promotion of wood use.
(2) Using wood in the interior space of the target building, it contributes to relaxation, liveliness, health and comfort.
(3) In addition, wood is used on the premises to contribute to relaxation, liveliness, health and comfort.
[Evaluation by lumber production area]
(4) More than 50% of the total volume of wood used in the target building is domestic timber.
(5) Of domestic timber, more than 20% of domestic timber use prefecture or local timber (* 1).
※1 Regional timber refers to wood produced in neighboring prefectures (Tokyo and Shizuoka prefectures belonging to the Kanto Koshin region) in consideration of the amount of carbon dioxide and wood production emitted during the transportation process.
| Evaluation | Numbers corresponding to (1) to (5) above |
|---|---|
| Level IV | 5 |
| Level III | 4 |
| Level II | 3 |
| Level I | 2 |
Comprehensive evaluation
| Quality Assessment | |||||
|---|---|---|---|---|---|
| Level IV | Level III |
Level II | Level I | ||
| Valuation of quantity | Level 4 | S | S | S | A |
| Level 3 | S | S | A | — | |
Style
Wood Use Evaluation Sheet (Form 1) (Excel: 39KB)
Reference: Labeling of wood in Yokohama City Building Environmental Performance Labeling System
In the Yokohama City Building Environmental Performance Labeling System, "Util wood" can be displayed. For more information, please refer to the following page.
What is Yokohama City Building Environmental Performance Indication System?
For inquiries to this page
Building Planning Division, Housing and Architecture Bureau Building Guidance Department
Phone: 045-671-4526
Phone: 045-671-4526
Fax: 045-550-3568
Email address: kc-casbee@city.yokohama.jp
Page ID: 762-052-402
