The 1973 edition of IS 1200 Part 21 outlines a uniform approach for measuring timber work and joinery in building and civil engineering projects. It offers comprehensive instructions on quantifying various wooden elements like doors, windows, stair parts, and fittings to enhance precision in cost evaluation and project oversight. This code is indispensable for professionals engaged in construction where wood joinery is involved.
Overview
The 1973 edition of IS 1200 Part 21 outlines a uniform approach for measuring timber work and joinery in building and civil engineering projects. It offers comprehensive instructions on quantifying various wooden elements like doors, windows, stair parts, and fittings to enhance precision in cost evaluation and project oversight. This code is indispensable for professionals engaged in construction where wood joinery is involved.
Audience
Contents
Structure
IS 1200 Part 21 establishes the measurement procedures for woodwork and joinery used in both buildings and civil engineering projects, including industrial and river valley constructions. Measurements must be recorded net, using the decimal system, following the positioning guidelines in Clauses 2.4.1 and 2.4.1.1. Final figures should be rounded according to IS 2:1960 rounding rules.
This section defines the general rules for woodwork measurement, emphasizing precise calculation of cubical content rounded to 0.001 m³. It details methods for linear, surface, and volume measurements, with units and rounding precision specified for length, area, and volume.
Item descriptions encompass all related activities such as transport, handling, fabrication, and fixing unless otherwise noted. Small components like keys, wedges, dowels, and pins for joints are included. Sundry items like wardrobes, cupboards, racks, brackets, and small fittings must be clearly described and enumerated.
This segment provides measurement techniques and formulas for various woodwork items including doors, windows, paneling, frames, and shutters. It highlights measurement units, finished surface inclusion, and exclusion of gaps or overlaps, ensuring consistent and accurate quantification.
Doors and window leaves are measured in square meters, with each leaf type quantified separately or clubbed as agreed. No extra measurement is taken for rebated or splayed meeting stiles. Trellis work is included with doors/windows, and vertical sliding cased frames are measured in running meters along their outer edges.
Boarding is measured in square meters with finished thickness specified, covering roof, weather, shelves, and linings. Weather boarding requires specification of width, thickness, and lap. Special provisions exist for curved surfaces and boarded floors, including joint and nailing methods.
Trellis work is measured in square meters, noting lath dimensions and spacing. One-way and two-way trellises are measured separately. Openings formed within trellis are included in the area, whereas supports like posts and rails are measured independently.
Shoring and strutting timbers are measured by volume in cubic meters including fasteners and erection labor. Separate labor measurements cover end shaping, notching, boring holes, and other modifications. Timber dimensions are recorded to the nearest 2 mm following defined categories.
Measurement of stair treads and risers uses area calculation combining tread length and exposed width plus rise. The process includes accounting for housing, joinery labor, and enumerating balusters with their sizes, ensuring detailed staircase quantification.
Trap doors are measured as extra items over corresponding doors or windows, described and enumerated separately. Their measurement is in square meters, including all associated labor such as cross-tonguing and framing. No additional measurement is taken for rebated stiles.
Pelmet boxes are quantified by running meters along their sides and face planking. Unlike boarding, no area or volume measurements are applied. Related turned work and cased frames also follow linear measurement protocols with specific dimensional notes.
Turned wood pieces are measured in running meters with girth (circumference) stated. Separate labor quantities cover shaping, notching, boring holes, and square cutting. A tolerance of ±1.5 mm per worked face is allowed unless specified otherwise.
Sundry woodwork items such as wardrobes, cupboards, draining boards, racks, brackets, towel rails, toilet fixtures, and small fittings are described and measured comprehensively. All fixing accessories and minor hardware are accounted for, facilitating detailed billing.
All measurements adhere to the decimal system with rounding according to IS 2-1960. Cubical contents are rounded to the nearest 0.001 m³. A tolerance margin of ±1.5 mm per wrought face applies unless otherwise specified, ensuring consistency and accuracy in recorded data.
Frequently Asked
IS 1200 Part 21 provides measurement methods for a range of woodwork and joinery elements used in buildings and civil engineering. Covered items include doors, windows, ventilators with frames and shutters, partitions, paneling, cupboards, shelves, wooden flooring, staircases and handrails, timber trusses and rafters, as well as other joinery components like skirtings and moldings. The standard applies to both structural and decorative timber works, specifying dimensions, thicknesses, and fittings to promote uniformity in cost estimation and construction documentation.
According to IS 1200 Part 21, doors and window leaves are measured in square meters, with each type measured separately. For combined types, measurement can be either as a single clubbed item or by dividing at the center of the separating rail to measure distinct portions. No additional measurement is taken for rebated or splayed meeting stiles. Trellis work integrated with doors or windows is measured together with the leaf, while cased frames for vertical sliding windows are measured in running meters along their outer edges to ensure consistent and accurate quantification.
Yes, IS 1200 Part 21 addresses measurement of curved and ramped timber pieces. Circular, ramped, and wreathed handrails are measured separately, with special elements like quadrants, short ramps, wreaths, and scroll ends enumerated individually. Timber cross-sectional dimensions are recorded to the nearest 2 mm, and the length along the actual curve or ramp is measured to ensure precise quantity assessment for these non-linear components.
Fittings like shelves, racks, curtain brackets, and similar accessories are measured separately from the main woodwork quantities as per IS 1200 Part 21. These items must be fully described and enumerated according to Clause 4.13. Fasteners such as nails and screws are included with the hardware, while supports like posts and rails are also measured independently. This approach clarifies billing and quantity estimation by distinctly accounting for minor joinery and fixtures.
The standard specifies that lengths and widths are measured to the nearest 0.01 meter (1 cm), with widths of single or detached planks recorded to the nearest 2 millimeters. Thickness and cross-sectional dimensions of timber elements like scantlings, battens, and baulks are also measured to the nearest 2 millimeters. Definitions clarify scantlings as cross-sections between 5 cm and 20 cm in both directions, battens as 5 cm or less in either direction, and baulks as exceeding 5 cm in one direction and 20 cm in the other. Wrought or planed timber requires separate measurement in line with Clause 3.12, ensuring precise dimensions for effective construction and estimation.
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