I.S. 89-1:1981

FOREWORD
DECLARATION
1 SCOPE
2 DEFINITIONS
   2.1 Basic module
   2.2 Characteristic strength
   2.3 Component
   2.4 Co-ordinating dimension
   2.5 Co-ordinating size
   2.6 Deviation
   2.7 Modular co-ordination
   2.8 Work size
3 MATERIALS
   3.1 Cement
   3.2 Aggregates
   3.3 Water
   3.4 Additives or admixtures
   3.5 Reinforcement
   3.6 Care and cleanliness of reinforcement
   3.7 The use of materials
4 TYPES OF PRECAST CONCRETE SILLS
   4.1 Type A
   4.2 Type B
   4.3 Type C
5 DIMENSIONS OF PRECAST CONCRETE SILLS
   5.1 Co-ordinating length
   5.2 Work size length
   5.3 Co-ordinating height
   5.4 Work size height and width
   5.5 Preferred lengths
6 CONSTRUCTION PROFILE OF CONCRETE SILLS
   6.1 Throating
   6.2 Stooling
   6.3 Deviations
7 BOW OR TWIST
   7.1 Bow or twist (Permissible value)
   7.2 Method of measuring bow or twist
8 GENERAL
   8.1 Moulds
   8.2 Finish
   8.3 Casting
   8.4 Freedom from defects
   8.5 Throating
   8.6 Inserts
9 CONCRETE
   9.1 Testing
   9.2 Concrete strength
   9.3 Low temperatures
   9.4 Curing of concrete
   9.5 Durability
   9.6 Time of delivery
   9.7 Reinforcement
   9.8 Cutting
10 INSERTS
11 PERFORMANCE REQUIREMENTS
   11.1 Water absorption
12 QUALITY CONTROL
   12.1 Records
   12.2 Water absorption
13 VERIFICATION OF COMPLIANCE
14 MANUFACTURER'S CERTIFICATE
15 MARKING AND ORDERING
Appendices
A Sectional sills
B Method of test for water absorption of concrete sills
Notes to Users

Covers requirements for precast concrete sills suitable for use with windows complying with I.S. 63-1 and I.S. 197-1.