IS 1626 Part 3:1994 delineates the specifications for asbestos cement roofing accessories compatible with corrugated and semi-corrugated asbestos cement sheets as per IS 459:1992. It addresses the manufacturing procedures, dimensional standards, marking protocols, and testing methods for diverse roofing components including ridges, ventilators, and expansion joints. This standard is crucial for producers, engineers, and quality assurance personnel engaged in the fabrication, selection, and installation of asbestos cement roofing elements in construction.
Overview
IS 1626 Part 3:1994 delineates the specifications for asbestos cement roofing accessories compatible with corrugated and semi-corrugated asbestos cement sheets as per IS 459:1992. It addresses the manufacturing procedures, dimensional standards, marking protocols, and testing methods for diverse roofing components including ridges, ventilators, and expansion joints. This standard is crucial for producers, engineers, and quality assurance personnel engaged in the fabrication, selection, and installation of asbestos cement roofing elements in construction.
Audience
Contents
Structure
This section details various asbestos cement roofing fittings such as serrated adjustable ridges, plain wing adjustable ridges, one-piece angular ridges, unserrated adjustable ridges for hips, close fitting and northlight adjustable ridges, eaves filler pieces, ridge finials, apron and barge boards including curved types, northlight/ventilator curves, cowl type ventilators, semi-corrugated expansion joints, louvres (S type), radial exhausts, and curved sheets.
A tabulated list enumerates fitting names, code numbers, and figure references, for example:
Fittings are made using inert aggregates comprising clean asbestos fibers and other suitable fibers, bonded by cements such as Ordinary Portland Cement (IS 269, 8112, 12269), Portland Slag Cement (IS 455), Portland Pozzolana Cement (IS 1489 Parts 1 & 2), or Rapid Hardening Portland Cement (IS 8041). Pozzolanic fillers and pigments compatible with asbestos cement can be incorporated except when using PSC or PPC. Coloring can be natural or pigmented with permanent pigments conforming to IS 5913.
Manufacturers declare dimensions, with shapes defined as per Table 1 and illustrated figures, and serrations matching corrugated sheets as per IS 459:1992.
Cement types include OPC, PSC, PPC, and Rapid Hardening Portland Cement, with pozzolanic additions disallowed in PSC and PPC. Pigments must comply with IS 5913 standards.
| Cement Type | IS Standard | Pozzolanic Fillers Allowed |
|---|---|---|
| Ordinary Portland Cement | IS 269/8112/12269 | Yes |
| Portland Slag Cement | IS 455 | No |
| Portland Pozzolana Cement | IS 1489 Parts 1 & 2 | No |
| Rapid Hardening Portland Cement | IS 8041 | Yes |
Material selection ensures durability and conformance to dimensional tolerances (Clause 5.1, Table 1).
| Attribute | Specification |
|---|---|
| Colour addition | Optional in composition or surface coating |
| Pigment type | Permanent pigments per IS 5913:1989 |
| Cement compatibility | OPC or compatible cement types |
| Pozzolanic filler usage | Allowed except with PPC/PSC |
Shapes and tolerances of fittings are defined in Clause 5.1 and Table 1, with serrations conforming to IS 459:1992.
| Parameter | Permissible Deviation |
|---|---|
| Linear dimensions | ±10 mm |
| Thickness (varies) | Typically ±0.5 to ±1.0 mm |
A classification diagram differentiates fittings for fully and semi-corrugated sheets.
Includes corrugated serrated adjustable ridges (C1), plain wing adjustable ridges (C2), corrugated eaves filler pieces (C5), semi-corrugated serrated adjustable ridges (SC1), and more.
| Thickness Range (mm) | Allowed Deviation (mm) |
|---|---|
| Up to 6 | ±0.5 |
| 6 to 10 | ±1.0 |
Visual diagrams detail fitting classifications for quick reference.
Finished components must be free from any visual faults.
Includes fittings for fully corrugated sheets like serrated adjustable ridges (C1) and eaves filler pieces (C5), as well as fittings for semi-corrugated sheets.
Graphical flow illustrating surface finish, edge quality, and compatibility requirements.
Fittings must have smooth surfaces, straight edges, and match the roofing sheets well.
Illustrates sampling based on lot size followed by testing and compliance verification.
List of fittings with code numbers and figure references (Table 1) to ensure conformity.
Thickness tolerances per Table 5.3.2 are enforced.
Outlines the process from production, dimension declaration, inspection, compliance verification to certification issuance and delivery.
Each asbestos cement roofing fitting must include:
Enumerates fitting types, code numbers, and figure details.
Flowchart describing marking, certification, and delivery with safety instructions.
Fittings must bear manufacturer ID, code number, date of manufacture, and pictorial warnings as per IS 12081 (Part 2):1987.
| Marking Aspect | Description |
|---|---|
| Manufacturer ID | Manufacturer’s name or logo |
| Code Number | As listed in Table 1 (e.g., C1) |
| Manufacture Date | Format DD/MM/YYYY or MM/YYYY |
| Pictorial Warning Signs | Per IS 12081 (Part 2) |
Details marking, attaching safety sheet, delivery, and safe usage steps.
Adherence to safety guidelines is vital due to asbestos hazards.
| IS Number | Title |
|---|---|
| 269 : 1989 | 33 Grade Ordinary Portland Cement (4th Revision) |
| 455 : 1989 | Portland Slag Cement (4th Revision) |
| 459 : 1992 | Corrugated and Semi-Corrugated Asbestos Cement Sheets |
| 8041 : 1990 | Rapid Hardening Portland Cement (2nd Revision) |
| 8112 : 1989 | 43 Grade Ordinary Portland Cement (1st Revision) |
| 11769 (Part 1) : 1987 | Safe Use of Asbestos Cement Products (Part 1) |
| 12081 (Part 2) : 1987 | Pictorial Warning Signs for Asbestos Products (Part 2) |
| 1489 (Part 1) : 1991 | Portland Pozzolana Cement: Fly Ash Based (3rd Revision) |
| 1489 (Part 2) : 1991 | Portland Pozzolana Cement: Calcined Clay Based (3rd Rev) |
| 5913 : 1989 | Test Methods for Asbestos Cement Products (1st Revision) |
| 12269 : 1987 | 53 Grade Ordinary Portland Cement |
The committee oversees the creation and maintenance of standards ensuring alignment with industry, research, and regulatory requirements.
Details on licensing and certification are in Clause 10.2.1 and the BIS Act. Safety documentation follows IS 11769 (Part 1):1987.
Frequently Asked
IS 1626 Part 3 covers asbestos cement roofing accessories designed for use with corrugated and semi-corrugated asbestos cement sheets conforming to IS 459:1992. The fittings include ridge pieces, valley pieces, hip pieces, gable ends, eave closures, rake pieces, fixing clips, brackets, and other specialized components essential for watertight and durable roofing assemblies. The standard specifies manufacturing and dimensional requirements, with fixing methods detailed in IS 3007 (Parts 1 & 2), and has updated tolerance and sampling procedures for quality assurance.
IS 1626 Part 3 (1994) permits the use of the following cement types for manufacturing asbestos cement roofing fittings: Ordinary Portland Cement (IS 269:1989, IS 8112:1989, IS 12269:1987), Portland Slag Cement (IS 455:1989), Portland Pozzolana Cement (IS 1489 Parts 1 & 2:1991), and Rapid Hardening Portland Cement (IS 8041:1990). Notably, when using Portland Pozzolana or Portland Slag Cement, additional pozzolanic materials are prohibited to maintain product integrity.
The standard defines dimensional tolerances as ±10 mm for linear measurements such as length, width, and height. Thickness tolerances follow specifications in Table 5.3.2 and typically range from ±0.5 mm up to ±1.0 mm depending on the fitting type. These tolerances ensure compatibility with corrugated and semi-corrugated asbestos cement sheets (per IS 459:1992). Serrations may be trimmed on-site for hips and ridges, and fittings must have smooth finishes and straight edges to guarantee proper assembly and durability.
Each asbestos cement roofing fitting must be marked clearly with the manufacturer’s name or trademark, the nominal size or type designation, and a batch or identification number for traceability. Certification requires a conformity certificate affirming compliance with IS 1626 Part 3, with tests confirming dimensional and physical requirements. Final test results should be rounded off following IS 2:1960 guidelines. This marking and certification process ensures product quality and compatibility with IS 459:1992 asbestos cement sheets.
Although IS 1626 Part 3 centers on manufacturing and quality, safe handling of asbestos cement roofing fittings requires adherence to established asbestos safety practices: avoid cutting or sanding to prevent fiber release; use personal protective equipment such as N95 masks, gloves, and protective clothing; work in well-ventilated areas; employ wet methods to suppress dust if cutting is unavoidable; dispose of asbestos waste per hazardous waste regulations; and perform visual inspections to detect defects before use. Manufacturers must provide certificates of conformity to ensure quality and minimize risks. These precautions align with the standard's emphasis on quality and durability while safeguarding health.
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