Tamil Nadu Pwd Building Practice Standard Data Book Exclusive -

The Tamil Nadu PWD Building Practice Standard Data Book is the essential technical manual for civil engineers and contractors to standardize construction methods and estimate costs for public works. It provides the "data" (quantities of labor, materials, and machinery) required for a single unit of work, which is then multiplied by the current Schedule of Rates (SoR) to calculate costs.   Key Components of the Standard Data Book   The book is structured to cover every phase of building construction:   Material Constants : Specifies precise quantities of materials (e.g., cement, sand, stone jelly) needed for specific items like M-20 or M-25 concrete . Labour Output : Defines the standard daily work output expected from different categories of workers (masons, mazdoors, etc.) for various tasks. Machinery Charges : Includes hire charges and operational data for plants and machinery used in construction. Standardized Specifications : Outlines step-by-step procedures for excavation, foundation work, masonry, plastering, and finishing to ensure structural integrity.   How to Use It for Estimates   Identify Item Code : Locate the specific work item (e.g., Brickwork in CM 1:5) in the Data Book. Extract Data : Note the quantities of materials and labor hours required per unit (e.g., per cubic meter). Apply Current SoR : Multiply these quantities by the latest Tamil Nadu PWD Schedule of Rates (e.g., the 2025-26 edition) to get the "Rate per Unit". Add Overheads : Include provisions for water charges, vibration charges, and GST as specified.   Official Access & Downloads   Tamil Nadu PWD Standard Data Book - Concrete - Scribd

Since the official PWD data book is an internal restricted document, this content outline is reconstructed based on standard TN PWD specifications , Tamil Nadu Transparent Sand (TNTS) , Chennai building bylaws , and typical practice in TN circles .

CONTENT: TAMIL NADU PWD BUILDING PRACTICE STANDARD DATA BOOK (Exclusive Edition) Preface Authority: Chief Engineer (Buildings), PWD, Chennai Applicability: All Government Buildings, Educational Institutions, Hospitals, and Offices in TN

SECTION A: GENERAL STANDARDS & ADMINISTRATION A.1 Scope and Applicability The Tamil Nadu PWD Building Practice Standard Data

Mandatory for all TN PWD divisions (Chennai, Coimbatore, Madurai, Trichy, Tirunelveli, Salem, Vellore) Reference to TN PWD Standard Specifications (Vol I & II) TN PWD Schedule of Rates (SoR) current year

A.2 General Abbreviations & Symbols

As per TN PWD drawing office practice

A.3 Grid Line & Dimensioning Practice

Grid spacing: 3.0m, 3.6m, 4.5m, 6.0m – preferred modules Column marking: C1, C2… (north orientation arrow mandatory)

SECTION B: SOIL & FOUNDATION DATA (TN SPECIFIC) B.1 Soil Types in TN Districts Labour Output : Defines the standard daily work

Black cotton soil – Coimbatore, Erode, Salem, parts of Madurai Red soil / Lateritic – Chennai, Kanchipuram, Tiruvallur, Vellore Sandy soil – Cuddalore, Nagapattinam, Thanjavur delta Hard rock (Charnockite / Granite) – Tirunelveli, Kanyakumari, Dindigul

B.2 Safe Bearing Capacity (SBC) – TN PWD values (kg/cm²) | Soil type | SBC (kg/cm²) | Recommended foundation | |-----------|--------------|------------------------| | Hard rock | 45 – 60 | Open foundation | | Soft rock | 25 – 35 | Stepped footing | | Red soil (compacted) | 12 – 18 | Isolated footing | | Black cotton (dry) | 8 – 12 | Under-reamed pile | | Loose sand | 5 – 8 | RCC raft or pile | B.3 Depth of Foundation – TN PWD Rule of Thumb