IS 13990:1994 is the Indian Standard (BIS) for precast reinforced concrete planks and joists for roofing and flooring. This standard specifies the requirements for materials, dimensions, manufacturing, and testing of precast reinforced concrete planks and joists. These components are primarily used for constructing flooring and roofing systems in buildings.
precast reinforced concrete planks and joists for roofing and flooring
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Minimum Concrete Compressive Strength | M15 (15 N/mm² cube strength) | C25/30 (25 N/mm² cylinder / 30 N/mm² cube strength) for beams | EN 15037-1 |
| Minimum Concrete Cover to Reinforcement (Mild Exposure) | 15 mm or bar diameter, whichever is greater | Nominal cover based on exposure class; typically 20-25 mm for mild exposure (XC1) after accounting for construction deviation | EN 1992-1-1 (referenced by EN 15037-1) |
| Standard Plank Thickness | 50 mm and 60 mm (solid planks) | Typically 50-75 mm for composite floor plates; 150-400 mm for hollow-core slabs | EN 13747 / EN 1168 |
| Length Tolerance for Joists/Beams | ±6 mm | ±10 mm for length ≤ 3m; ±15 mm for length 3-6m | EN 15037-1 |
| Straightness/Camber Tolerance for Joists | L/300 | ±L/300, but not more than 20 mm | EN 15037-1 |
| Load Test Criteria (Proof Load) | Dead Load + 1.25 x Imposed Load, held for 24 hours | Generally not a single formula; testing is tied to design verification with partial safety factors (e.g., test to failure or to a % of design ultimate load) | EN 15037-1 |