Non-coniferous timber in converted form for general purposes

IS 5966: Scope Overview

IS 5966 covers specifications for timber door and window shutters, focusing on dimensions, tolerances, and quality.

Key Points on Scope:

• Applies to door/window shutters made from timber.
• Dimensions and tolerances conform to IS 1331:1971 (cut sizes of timber).
• Definitions and terminology follow IS 707:1976 (seasoned timber).
• Numerical values and test results are rounded as per IS 2:1960 rules.

Important Specifications:

Dimensions & Tolerances:

• Dimensions must adhere to specified tolerances to ensure fit and function.
• Final test values rounded to match the precision of the standard.

flowchart LR
    A[Timber Shutter] --> B[Dimensions & Tolerances]
    B --> C[IS 1331:1971]
    B --> D[IS 2:1960 Rounding]
    A --> E[Definitions]
    E --> F[IS 707:1976]

For detailed dimension tables and tolerances, consult IS 1331 and IS 5966 clauses on dimensions.

IS 5966 Key References and Specifications Summary

• Rounding Off (IS 2:1960):

  • Final test results must be rounded off following IS 2:1960 rules.
  • Retain the same number of significant figures as specified in IS 5966.

• Dimensions and Tolerances:

  • Refer to Clause 5 of IS 5966 for specific dimensional limits and permissible tolerances on the product.

• Referenced Standards:

  • IS 707:1976 — Definitions related to the standard.
  • Additional referenced IS codes (not listed here) provide complementary requirements.

Important Notes:

If you need specific dimension tables or tolerance values, please specify the product or section for detailed data.

IS 5966: Definitions Summary

• Reference Standard: Definitions for IS 5966 are as per IS 707:1976 - Glossary of terms applicable to timber technology and utilization.
• Key Point: IS 5966 does not provide standalone definitions; it defers to IS 707 for all timber-related terminology.
• Rounding Off: Test results must be rounded according to IS 2:1960 rules, keeping the same number of significant figures as specified values.

Important References:

Practical Tip:

• When working with IS 5966, always consult IS 707 for term definitions like "seasoning," "moisture content," "defects," etc.
• Use IS 2 for consistent numerical rounding in test results.

flowchart LR
    A[IS 5966 Definitions] --> B[Refer IS 707:1976]
    A --> C[Use IS 2:1960 for rounding]
    B --> D[Timber Terminology]
    C --> E[Rounding Rules]

This ensures clarity and uniformity in timber testing and specification.

IS 5966: Species of Timber for General Purposes (Ref: IS 1326:1992)

• Species: Timber must be from species listed in Annex B of IS 1326:1992 (Non-coniferous sawn timber specification).
• Moisture Content Limits (Clause 6.2):
  • Up to 50 mm thickness: max 18% moisture within 10 mm depth from surface.
  • Over 50 mm thickness: max 18% moisture within 10 mm depth.
  • Seasoned timber: as per specified moisture content.
• Measurement Standards:
  • Length: in meters, nearest lower 0.05 m.
  • Width: in mm, nearest lower 10 mm.
  • Thickness: in mm, nearest lower 5 mm.
  • Volume: cubic meters, 3 decimal places.
• Permissible Defects (Table 1 highlights):
  • Defects measured per IS 3364 (Part 2):1976.
  • Plugging defects not allowed.
  • Defects considered collectively for Grade I and II timber.
  • Specific limits on checks and borer holes depending on thickness.

Summary Table: Moisture Content Limits

For detailed species list and defect limits, refer to Annex B of IS 1326:1992 and Table 1 in IS 5966.

flowchart LR
A[Non-coniferous Timber] --> B[Species as per IS 1326 Annex B]
B --> C[Moisture Content Limits]
C --> D[Measurement Standards]
D --> E[Permissible Defects]
E --> F[Grade I & II Timber]

This ensures timber quality suitable for general structural and non-structural purposes.

IS 5966: Dimensions and Tolerances for Cut Timber

Key Specifications (Clause 5.2)

• Minus tolerance beyond the above limits is allowed in max 10% of supply only.
• For specified width ranges (e.g., 150 to 250 mm), no minus tolerance allowed on minimum width and no plus tolerance on maximum width.

Additional Notes

• Dimensions must conform to IS 1331:1971 for cut sizes of timber.
• These tolerances ensure quality and uniformity in timber sizing for structural use.

Summary Table for Tolerances

flowchart LR
A[Order for Timber Dimensions] --> B{Dimension ≤ 100 mm?}
B -- Yes --> C[No tolerance allowed (0 mm)]
B -- No --> D[+6 mm / -3 mm tolerance]
D --> E[Minus tolerance ≤ 10% of supply]
F[Width range specified?] --> G[No minus on min, no plus on max]

This ensures timber meets structural accuracy per IS 5966 & IS 1331 standards.

IS 5966: Requirements for Grading Timber

1. Tolerances in Sizes (Clause 5.2)

• Width & thickness ≤ 100 mm: No tolerance (0 mm)
• Width & thickness > 100 mm: +6 mm / -3 mm
• Minus tolerance not allowed in >10% of supply.
• For definite width ranges (e.g., 150-250 mm), no minus tolerance on minimum or plus tolerance on maximum.

2. Grading Defects & Limits (Clause 8.1, Table 1)

Note: Live knots are not allowed within 1.5 times the

IS 5966: Moisture Content & Specifications for Converted Timber

Moisture Content Limits (Clause 6.2)

• Timber ≤ 50 mm thickness: Max 18% moisture within 10 mm depth from surface.
• Timber > 50 mm thickness: Max 18% moisture within 10 mm depth from surface.
• Seasoned timber: As specifically demanded (specified moisture content).

Measurement & Volume Computation

• Length: Measured in meters, fractions to nearest lower 0.05 m.
• Width: Measured in mm, nearest lower 10 mm.
• Thickness: Measured in mm, nearest lower 5 mm.
• Volume: Computed in cubic meters, accurate to 3 decimals.

Permissible Defects (Table 1 Summary)

Moisture Content Calculation (from IS 11215)

Moisture content (MC) is typically calculated by:

[ MC = \frac{W_{wet} - W_{dry}}

IS 5966 - Permissible Defects for Converted Timber (Clause 8.1, Table 1)

Note: Live knots are not allowed within 1.5 times the smallest thickness near joints.

Additional Specifications:

• Measurement tolerances: Length to nearest 0.05 m, width nearest 10 mm, thickness nearest 5 mm.
• Moisture content: Max 18% for timber up to 50

IS 5966 - Marking of Converted Timber (Clause 9.2)

• Marking Requirements:

  • Each piece of converted timber shall be marked at a convenient place.
  • Marking must include:
    • Source of manufacture
    • Year of supply
  • Use letters of at least 20 mm size for marking.
  • Timber may also carry the Standard Mark as per BIS regulations.

• Standard Mark Use:

  • Indicates compliance with IS 5966 under BIS inspection and quality control.
  • Governed by Bureau of Indian Standards Act, 1986.
  • Licensing details available from BIS.

Summary Table for Marking Details

Preservation Note (related to marking):

• Ends of timber must be treated to prevent cracking (at least 25 mm beyond longest split).
• Preservative treatment as per IS 401:1982.
• End coating materials as per IS 1141:1973.

flowchart TD
    A[Converted Timber] --> B[Marking]
    B --> C{Marking Details}
    C --> D[Source of Manufacture]
    C --> E[Year of Supply]
    C --> F[Letter size ≥ 20 mm]
    B --> G[Standard Mark (optional)]
    G --> H[BIS License & Quality Control]

This ensures traceability and quality assurance of timber products per IS 5966.

IS 5966: Preservation of Timber - Key Points

• Preservative Treatment: All timber containing sapwood must be treated as per IS 401:1982 (Code of Practice for Preservation of Timber).

• End Coating: To prevent end cracking/splitting, treat timber ends (planks, scantlings) to at least 25 mm beyond the longest split length using materials per IS 1141:1973.

• Timing: End coating should be applied immediately after timber inspection.

• Standard Marking: Timber pieces may be marked with the BIS Standard Mark ensuring compliance with quality and inspection norms.

Summary Table: Preservation Treatment (IS 5966 & IS 401)

Notes:

• Preservation protects against decay, insects, and fungal attack.
• Moisture content affects preservative uptake; refer IS 11215:1991 for moisture determination.
• Proper marking ensures traceability and quality assurance under BIS.

flowchart LR
    A[Timber with Sapwood] --> B{Preservative Treatment?}
    B -- Yes --> C[Apply treatment as per IS 401:1982]
    C --> D[End Coating]
    D --> E[Coat ends ≥ (Longest split + 25mm) per IS 1141]
    E --> F[Apply immediately after inspection]
    F --> G[Optional: BIS Standard Mark]
    B -- No --> H[No treatment required]

This concise guidance ensures timber durability and compliance with IS 5966 preservation requirements.

IS 5966: Measurement and Evaluation of Defects in Converted Timber (Part 2)

Key Specifications & Permissible Limits (Table 1, Clause 8.1)

Measurement & Tolerances (Clause 5 & 6.2)

• Length: Measured in meters, rounded down to nearest 0.05 m.
• Width: Measured in mm, nearest lower 10 mm.
• Thickness: Measured in mm, nearest lower 5 mm.
• Volume:

Use of Standard Mark as per IS 5966: Clause 9.2

• Standard Mark indicates compliance with IS 5966, assuring quality under BIS supervision.
• It is granted under the Bureau of Indian Standards Act, 1986.
• Products bearing the mark have undergone:
  • Inspection
  • Testing
  • Quality control by the producer under BIS guidelines
  • Continuous conformity checks by BIS.

Key Points:

• The Standard Mark can be applied on converted timber pieces.
• It symbolizes adherence to all relevant quality and dimensional requirements in IS 5966.
• Licenses for use are issued by BIS; details can be obtained from BIS offices.

Related Specifications:

• Preservation of sapwood per IS 401:1982.
• End coating to prevent cracking per IS 1141:1973 (minimum 25 mm beyond longest split).

Summary Table: BIS Standard Mark Usage

For more info, contact BIS regional offices listed in IS 5966.

flowchart LR
    A[Manufacturer] --> B[Quality Control System]
    B --> C[Inspection & Testing]
    C --> D{Compliance with IS 5966?}
    D -- Yes --> E[Apply Standard Mark]
    E --> F[BIS Continuous Surveillance]
    D -- No --> G[No Marking]

This ensures that timber with the Standard Mark meets IS 5966 requirements and quality standards.

Rounding Off Numerical Values as per IS 5966 & IS 2:1960

• Final test values must be rounded off following IS 2:1960 rules.
• The number of significant figures in the rounded value should match the specified value in IS 5966.
• This ensures consistency and compliance in reporting test results.

Key Rounding Rules (IS 2:1960 Summary)

Example:

• Specified value: 12.3 (3 significant figures)
• Calculated value: 12.3456 → Rounded to 12.3

Tolerances on Timber Sizes (Clause 5.2)

• Minus tolerance allowed only for ≤10% of supply.
• For ranges (e.g., 150-250 mm), no minus tolerance on min or plus on max.

flowchart TD
    A[Measured Value] --> B{Number of significant figures?}
    B --> C[Match specified value]
    C --> D[Apply IS 2:1960 rounding rules]
    D --> E[Final Rounded Value]

Summary: Always round test values to the same significant figures as the standard, using IS 2:1960 rules, ensuring clear and consistent compliance reporting.

IS 5966 Amendments & Revisions Summary

• Amendment No. 1 (March 2002) updates IS 5966:1993, covering Non-Coniferous Timber in Converted Form for general use.
• Related references include:
  • IS 1331:1971 – Cut sizes of timber.
  • IS 401:1982 – Timber preservation code.
  • IS 707:1976 – Timber technology glossary.

Key Points on Amendments:

• Amendments clarify or update specifications without rewriting the entire code.
• They ensure alignment with latest practices, materials, and safety.
• Usually specify revised dimensions, quality grades, or treatment methods.

Typical Specification Updates May Include:

flowchart LR
    A[IS 5966:1993] --> B[Amendment No.1 (2002)]
    B --> C[Updated Timber Sizes (IS 1331)]
    B --> D[Updated Preservation (IS 401)]
    B --> E[Updated Glossary (IS 707)]

Note: For detailed formulas or tables, refer to the specific IS codes mentioned above. IS 5966 mainly references these for dimensions, preservation, and terminology updates.

IS 5966 primarily deals with Specifications for Wooden Doors.

Key Annexes & Specifications Summary:

• Annex on Dimensions & Tolerances (Clause 5):

  • Door sizes follow IS 1331:1971 (Cut sizes of timber).
  • Standard thicknesses: 35 mm, 40 mm, 45 mm (common for flush doors).
  • Width and height tolerances typically ±2 mm.

• Reference to IS 707:1976:

  • Defines timber species, quality grading, and seasoning requirements.
  • Ensures moisture content is controlled (usually 12±2%).

Typical Dimensions Table (from IS 1331):

Important Notes:

• Tolerances: Length and width ±2 mm; thickness ±1 mm.
• Moisture Content: 10-15% as per IS 707.
• Timber Quality: Must comply with IS 2202 for seasoning and defects.

flowchart LR
  A[IS 5966 Standard] --> B[Dimensions & Tolerances (IS 1331)]
  A --> C[Timber Quality (IS 707)]
  B --> D[Thickness: 35-45 mm]
  B --> E[Width: 600-1000 mm]
  B --> F[Height: 1800-2100 mm]
  C --> G[Moisture: 12±2%]
  C --> H[Seasoned Timber]

For detailed door design, refer to IS 5966 Annexes and IS 1331 tables for precise sizing and IS 707 for timber specs.