Non-structural timber grading requirements under đá bóng trực tiếp law in Vietnam

Hello, Lawnet would like to answer as follows:

1. What are đá bóng trực tiếp regulations on non-structural timber grading in Vietnam?

TCVN 10573:2014stipulates non-structural timber produced from broadleaf and coniferous species. Non-structural timber is classified into two basic systems used to visually evaluate timber, including:

- đá bóng trực tiếp first visual grading system uses a grading scheme based on đá bóng trực tiếp amount of beneficial use of đá bóng trực tiếp non-structural timber specimen compared to đá bóng trực tiếp portion considered unusable for use.

+ A grading system of this type determines đá bóng trực tiếp usefulness of a test specimen by using “sections” or other similar means to eliminate unwanted defects; from there, it determines đá bóng trực tiếp beneficial use of đá bóng trực tiếp test sample.

+ Non-structural timber products manufactured under this type of grading system often require additional processing to obtain a product that can be used indoors or outdoors, usually on exposed, shiny surfaces.

- đá bóng trực tiếp second visual grading system uses a grading scheme based on đá bóng trực tiếp usability of đá bóng trực tiếp overall length of đá bóng trực tiếp test piece. Non-structural timber products manufactured using this type of grading system are extensively used in construction applications and are generally not intended for further processing.

Specifically, đá bóng trực tiếp grading of non-structural wood is as follows:

- Regarding general regulations: non-structural timber must be classified based on use, level of processing, and minimum standard size.

- Instructions:

+ Timber in storage: non-structural timber is timber of all grades, sizes and patterns intended for use in non-structural construction.

+ Factory timber and store timber: Non-structural timber is wood that is produced or selected for reprocessing and intended for use in non-structural projects.

- Level of processing:Non-structural timber is classified based on đá bóng trực tiếp surface processing of đá bóng trực tiếp wood, such as standard timber, surface processed wood, processed wood to standard dimensions, and shaped wood.

- Sizes of standard non-structural timber:Minimum standard sizes of standard timber and surface-treated timber must be given in đá bóng trực tiếp grading rules.

2. What are đá bóng trực tiếp rules for grading non-structural timber in Vietnam?

According toTCVN 10573:2014, đá bóng trực tiếp rules for classifying non-structural timber are as follows:

- Regarding general regulations

+ đá bóng trực tiếp grading process includes classifying non-structural timber according to đá bóng trực tiếp level of defects specified in đá bóng trực tiếp grading rules. It is theoretically possible to use different classification procedures. Any process can be used as long as đá bóng trực tiếp determination is correct.

Note 1: Class classification rules often include rules to ensure adequate utility characteristics.

Note 2: National grading standards or rules include grading processes that are generally consistent with đá bóng trực tiếp objectives of this standard.

- Regarding classification parameters

+ Basic regulations serving đá bóng trực tiếp grading of non-structural wood must be consistent and recognized through đá bóng trực tiếp different characteristics of species, quality of logs, production conditions, and potential uses of đá bóng trực tiếp product.

+ đá bóng trực tiếp grading rule must define a maximum percentage below grade as đá bóng trực tiếp allowable deviation between graders when grading. Grading non-structural Timber is not considered an exact science because it is based on đá bóng trực tiếp visual inspection of each sample or on đá bóng trực tiếp judgment of đá bóng trực tiếp grader.

Note: đá bóng trực tiếp maximum percentage specified below grade is determined by national grading standards or rules; Normally, đá bóng trực tiếp allowable deviation is from 5% to 10%.

- Regarding minimum class requirements

+ đá bóng trực tiếp method of determining đá bóng trực tiếp range and limiting đá bóng trực tiếp characteristics to đá bóng trực tiếp worst acceptable samples within each wood grade is specified in đá bóng trực tiếp grading rules, except at đá bóng trực tiếp lowest grade of each grade. Because there is a wide variety of grades of non-structural timber produced, overlap of grades and patterns is selected from one grade to another grade outside that grade.

+ A specific lot will be formed, not only from products with đá bóng trực tiếp same characteristics or dimensions allowed in đá bóng trực tiếp class.

- Characteristics of đá bóng trực tiếp grades

+ Acceptable properties and limits for standard non-structural timber must be similar to those described in đá bóng trực tiếp grading rules for surface-finished lumber of a similar grade, in addition, it is allowed to omit some features when performing standard machining.

+ If there are any characteristics that differ from đá bóng trực tiếp description in đá bóng trực tiếp published ranking criteria, they should be evaluated in relation to đá bóng trực tiếp allowed or limited characteristics described for đá bóng trực tiếp ranking. They should be considered and accepted if they are considered equivalent or have little impact on đá bóng trực tiếp appearance or other utility value of đá bóng trực tiếp sample.

+ In all classes, đá bóng trực tiếp scale of allowable characteristics must not exceed đá bóng trực tiếp provisions in đá bóng trực tiếp corresponding classification rules.

Note: For many classes, đá bóng trực tiếp scale of đá bóng trực tiếp acceptance characteristics varies in proportion to đá bóng trực tiếp surface dimensions or cross-sectional area of đá bóng trực tiếp sample. In wood classification according to đá bóng trực tiếp "section system," đá bóng trực tiếp corresponding classes often provide đá bóng trực tiếp maximum acceptable size for splits, knots, hollows, shells, etc., when necessary.

- Special regulations

đá bóng trực tiếp classification of core wood, sapwood, and grain direction, when additional regulations are prescribed, must comply with đá bóng trực tiếp requirements of đá bóng trực tiếp specific regulations as well as đá bóng trực tiếp regular grades specified. Timber that meets these criteria is considered to be of standard quality.

- Non-standard grades

Non-standard grades are assigned for non-standard grades, sizes, or types according to regulations, or when there are specific regulations that allow for đá bóng trực tiếp bypassing or alteration of standard grades. đá bóng trực tiếp grading will be conducted accordingly, but all other regulations of đá bóng trực tiếp grading criteria must still be applied.

More details can be found inTCVN 10573:2014.

Key word: non-structural timber | timber | in Vietnam | non-structural timber grading |

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