IS 109571999AI Search Enabled✦ AI Generated

Joints in Buildings - Vocabulary

IS 10957:1999 defines the vocabulary related to joints in building construction, standardizing terms for joint components, profiles, gaps, surfaces, and jointing products. It applies to engineers, architects, and construction professionals involved in designing, specifying, or evaluating building joints to ensure clear communication and consistent understanding of joint terminology in India.

2Sections
42Clauses Indexed
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1999Edition
Building Construction Practices including Painting Varnishing and Allied FinishingCategory
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Overview

What This Standard Covers

IS 10957:1999 defines the vocabulary related to joints in building construction, standardizing terms for joint components, profiles, gaps, surfaces, and jointing products. It applies to engineers, architects, and construction professionals involved in designing, specifying, or evaluating building joints to ensure clear communication and consistent understanding of joint terminology in India.

Audience

Who Uses This Standard

  • Structural Engineers
  • Architects
  • Civil Engineers
  • Construction Managers
  • Building Inspectors
  • Quality Assurance Professionals
  • Materials Specialists

Contents

Key Topics Covered

✓Definitions of joint and jointing products
✓Joint profiles and profile surfaces
✓Joint gaps, gap width, and gap depth
✓Joint faces and joint clearance
✓Joint reference planes
✓Joint contact surfaces (interfaces)
✓Joint steps and margins
✓Joint length and surface visibility
✓Classification of jointing products
✓Terminology for joint fit and contact
✓Distinction between joint and jointing material
✓Standardized vocabulary aligned with ISO 2444:1988

Structure

Table of Contents

1Scope▼

IS 10957:1999 - Scope Overview

  • Scope: Defines vocabulary related to joints in buildings, covering types, functions, and components.
  • Field of Application: Applies to all types of building joints including expansion, contraction, construction, and movement joints.
  • Purpose: Standardizes terminology for clear communication among engineers, architects, and contractors.

Key Points:

  • No direct formulas or tables as it is a vocabulary standard.
  • Complements design codes by clarifying joint-related terms.
  • Cross-references ISO 2444:1988 for international consistency.

Typical Joint Types (as per vocabulary):

  • Expansion Joint: Allows for thermal expansion.
  • Contraction Joint: Controls cracking due to shrinkage.
  • Construction Joint: Formed when concrete placement is interrupted.
  • Movement Joint: Accommodates structural movements.
graph LR
A[Joints in Buildings] --> B[Expansion Joint]
A --> C[Contraction Joint]
A --> D[Construction Joint]
A --> E[Movement Joint]

For design formulas and tables, refer to IS codes like IS 456 (Concrete), IS 16700 (Sealants), or specific structural design standards.

2Terms and definitions▼

IS 10957 primarily serves as a vocabulary standard for joints in buildings, defining terms related to types, components, and design aspects of building joints.

Key Points from Clause 2 (Terms and Definitions):

  • Purpose: Standardizes terminology for building joints to ensure uniform understanding.
  • Scope: Covers types of joints (e.g., expansion, construction, control), joint components (sealants, fillers), and design concepts.
  • No formulas or tables are provided in this clause, as it is purely definitional.

Typical Terms Defined Include:

  • Expansion Joint: A joint allowing movement due to thermal expansion.
  • Control Joint: A joint to control cracking.
  • Sealant: Material used to seal joints.
  • Backing Material: Filler placed behind sealant.

Summary:

TermDefinition
Expansion JointJoint allowing movement due to expansion.
Control JointJoint to control cracking in concrete.
SealantMaterial sealing the joint against ingress.
Backing MaterialFiller supporting the sealant in joints.

For design and calculations, refer to IS 456 or IS 1905 for structural joints and sealant specifications.

graph LR
A[Building Structure] --> B[Joint]
B --> C[Expansion Joint]
B --> D[Control Joint]
B --> E[Sealant]
E --> F[Backing Material]

Note: IS 10957 is a vocabulary standard; consult related codes for design formulas.

Frequently Asked

Popular Questions About IS 10957

?What is the definition of a joint according to IS 10957?▼

According to IS 10957:1999 (Clause 2.1), a joint is defined as:

"Construction formed by the adjacent parts of two or more products, components or building elements, when these are put together or fixed with or without the use of a jointing product."

Key points:

  • It involves two or more building elements.
  • The elements are adjacent and joined.
  • The joint may or may not include a jointing product (e.g., sealants, adhesives).

Additional related terms:

  • Joint surface (Clause 2.13): Visible surface of a joint.
  • Joint reference plane (Clause 2.3): Theoretical plane to determine relative position of joint profiles.
Loading diagram...

This definition aligns with ISO 6707-1 (5.5.29) for consistency in terminology.

?How does IS 10957 classify jointing products and materials?▼

IS 10957 classifies jointing products and materials as follows:

  • Jointing product: A building product used to achieve the desired joint performance.
  • Jointing material: A jointing product with no definite form before use (e.g., mortar, sealant, glue).
  • Jointing section: A jointing product preformed to a definite cross-section but unspecified length.
  • Jointing component: A jointing product formed as a distinct unit with specified sizes in all three dimensions.

This classification helps avoid confusion by distinguishing between general "joint" and specific jointing products.

Summary Table

TermDescriptionExample
Jointing productProduct to ensure joint performanceSealants, mortars
Jointing materialNo definite form before useMortar, glue
Jointing sectionPreformed definite section, unspecified lengthPreformed gaskets
Jointing componentDistinct unit with specified 3D sizesPrecast joint blocks

This clear classification aids in specifying and selecting appropriate jointing products in construction.

?What terms describe the dimensions and surfaces of joints?▼

According to IS 10957:1999 (ISO 2444:1988), the key terms describing joint dimensions and surfaces are:

  • Joint Surface (Clause 2.13): The visible surface of a joint.
  • Joint Face (Clause 2.9): Part(s) of the joint profile surface considered to achieve fit.
  • Joint Length (Clause 2.12): Dimension of the joint measured perpendicular to its cross-section.
  • Joint Gap Depth (Clause 2.8): Dimension(s) across the joint, measured parallel to the joint reference plane. Multiple gap depths can exist depending on the joint design.

These terms help precisely define and measure the geometry and fit of joints in structural elements.

Loading diagram...
?How is joint clearance different from joint gap width?▼

Difference between Joint Clearance and Joint Gap Width (IS 10957):

  • Joint Clearance (Clause 2.10):

    • Distance between the joint faces of adjacent components considered to achieve fit.
    • For joints with plane, parallel surfaces, joint clearance = joint gap width.

  • Joint Gap Width (Clause 2.7):

    • Dimension measured perpendicular to the joint reference plane across the joint.
    • A joint may have multiple gap widths depending on design.

Summary:

  • Joint gap width is a geometric dimension across the joint.
  • Joint clearance is the effective distance for fitting, equal to gap width only if joint faces are plane and parallel.
Loading diagram...

This clarifies that joint clearance is a functional fit measure, while joint gap width is a geometric dimension.

?Why is standardized joint vocabulary important in building construction?▼

Importance of Standardized Joint Vocabulary in Building Construction (IS 10957 / ISO 2444:1988):

  • Clear Communication: Ensures all stakeholders (engineers, architects, contractors) use the same terms, reducing misunderstandings.
  • Consistency: Provides uniform definitions for joint types, parts, and design, facilitating standardized documentation and specifications.
  • Quality Control: Helps in accurate inspection, maintenance, and repair by clearly identifying joint components.
  • Design Efficiency: Enables precise coordination of joint design details, improving structural integrity and durability.
  • International Alignment: Adoption of ISO vocabulary ensures compatibility with global practices and codes.

In summary: Standardized vocabulary is critical for effective collaboration, quality assurance, and safety in building construction involving joints.

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