IS 109571999AI Search Enabled✦ AI Generated

Joints in Buildings - Vocabulary
1999 Edition

The IS 10957:1999 standard establishes a consistent terminology framework for joints used in building construction. It defines terms related to joint elements, profiles, gaps, surfaces, and jointing materials, facilitating clear communication among design and construction professionals across 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

The IS 10957:1999 standard establishes a consistent terminology framework for joints used in building construction. It defines terms related to joint elements, profiles, gaps, surfaces, and jointing materials, facilitating clear communication among design and construction professionals across India.

Audience

Who Uses This Standard

  • Structural design engineers
  • Building architects
  • Civil construction engineers
  • Project site managers
  • Building code inspectors
  • Quality control specialists
  • Materials and product experts

Contents

Key Topics Covered

✓Terminology for joints and jointing materials
✓Profiles and surface definitions of joints
✓Dimensions of joint gaps including width and depth
✓Descriptions of joint faces and clearance
✓Reference planes used in joint measurements
✓Interfaces and contact surfaces in joints
✓Definitions of joint steps and margins
✓Measurement of joint length and visible surfaces
✓Categorization of jointing products
✓Vocabulary for joint fit and contact conditions
✓Distinguishing joints from jointing materials
✓Alignment with ISO 2444:1988 terminology standards

Structure

Table of Contents

1Scope and Application▼

Overview of IS 10957:1999 Scope

  • Scope: Establishes standardized vocabulary concerning building joints, including their types, roles, and components.
  • Applicability: Relevant to all building joint forms such as expansion, contraction, construction, and movement joints.
  • Objective: Harmonizes terminology to enable effective communication among engineers, architects, and contractors.

Highlights:

  • The standard is purely terminological; it does not provide calculation formulas or tabular data.
  • Serves as a complement to design codes by clarifying joint-related language.
  • References ISO 2444:1988 to ensure international consistency.

Common Joint Types Defined:

  • Expansion Joint: Permits thermal movement.
  • Contraction Joint: Controls shrinkage-induced cracking.
  • Construction Joint: Formed when concrete placement is paused.
  • Movement Joint: Accommodates structural shifts.
graph LR
J[Joints in Buildings] --> E[Expansion Joint]
J --> C[Contraction Joint]
J --> K[Construction Joint]
J --> M[Movement Joint]

For detailed design practices and formulae, refer to codes like IS 456 (Plain and Reinforced Concrete), IS 16700 (Sealants), or other structural design standards.

2Terminology and Definitions▼

IS 10957 serves primarily as a vocabulary reference for building joints, detailing terms related to joint types, components, and aspects of joint design.

Key Points from Clause 2 (Terms and Definitions):

  • Purpose: To create uniform terminology for building joints, ensuring consistent understanding.
  • Coverage: Includes joint varieties (e.g., expansion, construction, control), components like sealants and fillers, and design-related terms.
  • No formulas or tables are included in this section as it is strictly definitional.

Representative Terms Defined:

  • Expansion Joint: Joint designed to allow thermal expansion.
  • Control Joint: Joint intended to manage cracking.
  • Sealant: Material applied to seal joints.
  • Backing Material: Filler positioned behind the sealant.

Definition Summary:

TermMeaning
Expansion JointJoint enabling movement due to expansion.
Control JointJoint for controlling cracks in concrete.
SealantMaterial sealing joint gaps against ingress.
Backing MaterialSupport material behind sealants in joints.

For detailed engineering design and calculation guidance, refer to IS 456 or IS 1905 relating to structural joints and sealant standards.

graph LR
Structure[Building Structure] --> Joint[Joint]
Joint --> Exp[Expansion Joint]
Joint --> Ctrl[Control Joint]
Joint --> Seal[Sealant]
Seal --> Back[Backing Material]

Note: IS 10957 focuses on terminology; design instructions are found in complementary standards.

Frequently Asked

Popular Questions About IS 10957

?How does IS 10957 define a joint in building construction?▼

Per IS 10957:1999 (Clause 2.1), a joint is described as:

"A construction formed by adjoining parts of two or more products, components, or building elements that are connected or assembled, with or without the use of a jointing product."

Key aspects:

  • Involves at least two adjacent building components.
  • The components are connected or placed next to each other.
  • The joint may include or exclude jointing products such as sealants or adhesives.

Additional terminology:

  • Joint surface (Clause 2.13): The visible area of the joint.
  • Joint reference plane (Clause 2.3): A conceptual plane used to define the relative position of joint profiles.
Loading diagram...

This aligns with the ISO 6707-1 definition to maintain international terminology consistency.

?What are the classifications of jointing products and materials according to IS 10957?▼

IS 10957 distinguishes jointing products and materials as follows:

  • Jointing product: A building product employed to fulfill the functional requirements of a joint.
  • Jointing material: A jointing product that lacks a fixed form prior to use, such as mortar, sealant, or adhesive.
  • Jointing section: A jointing product shaped with a defined cross-section but unspecified length.
  • Jointing component: A jointing product manufactured as a discrete unit with specific dimensions in all directions.

This classification clarifies terminology by differentiating the general "joint" from specific jointing products.

Classification Summary:

TermDescriptionExample
Jointing productProduct ensuring joint functionSealants, mortars
Jointing materialFormless product before applicationMortar, adhesive
Jointing sectionPre-shaped cross-section with unspecified lengthPreformed gaskets
Jointing componentUnit with defined 3D dimensionsPrecast joint blocks

This categorization aids specification and selection of suitable jointing products in construction projects.

?Which terms describe the dimensions and surfaces of joints in IS 10957?▼

According to IS 10957:1999 (aligned with ISO 2444:1988), important terms defining joint geometry include:

  • Joint Surface (Clause 2.13): The visible surface area of a joint.
  • Joint Face (Clause 2.9): The specific parts of the joint profile surface intended to establish fit.
  • Joint Length (Clause 2.12): The measurement of a joint along the direction perpendicular to its cross-section.
  • Joint Gap Depth (Clause 2.8): The measurement across the joint parallel to the joint reference plane; multiple gap depths may apply depending on joint configuration.

These definitions help accurately describe and measure joint dimensions and fit.

Loading diagram...
?What distinguishes joint clearance from joint gap width in IS 10957?▼

In IS 10957, the distinction is as follows:

  • Joint Clearance (Clause 2.10): The distance between the joint faces of adjoining components that is relevant for achieving a proper fit. For joints with planar, parallel faces, joint clearance equals the joint gap width.

  • Joint Gap Width (Clause 2.7): The dimension measured perpendicular to the joint reference plane across the joint space. A joint may have multiple gap widths depending on its design.

Summary:

  • Joint gap width is a geometric measurement across the joint.
  • Joint clearance is a functional fit measurement, identical to gap width only if joint faces are flat and parallel.
Loading diagram...

This clarifies that joint clearance pertains to fit, whereas gap width is a dimensional attribute.

?Why is having a standardized vocabulary for joints essential in building construction?▼

The use of a standardized joint vocabulary, as provided by IS 10957 and ISO 2444:1988, is crucial for several reasons:

  • Facilitates Clear Communication: Ensures all participants—engineers, architects, and contractors—use consistent terminology, minimizing misunderstandings.
  • Promotes Consistency: Provides uniform definitions for various joint types, components, and design aspects, enabling standardized documentation and specifications.
  • Supports Quality Assurance: Assists in accurate inspection, maintenance, and repair by precisely identifying joint elements.
  • Enhances Design Coordination: Improves the precision of joint design details, thereby supporting structural integrity and longevity.
  • Ensures International Compatibility: Aligns terminology with global standards, facilitating harmonization with international practices and codes.

In essence, standardized joint terminology is vital for effective collaboration, quality control, and safety throughout building construction projects.

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