What is the minimum grade of concrete to be used for manufacturing L-Panels?

Grade M20 concrete is specified as the minimum (Clause 4.1).

What is the minimum clear cover to reinforcement in the L-Panel units?

A nominal cover of 15 mm is required (Clause 6.3.3).

What is the recommended thickness for the in-situ concrete topping over the L-Panels?

An average thickness of 40 mm is specified for the structural topping (Clause 8.1.1).

What are the primary loads to be considered for design?

The design must account for dead loads, live loads (as per IS 875 Part 2), and wind loads (as per IS 875 Part 3) (Clause 5.2).

IS 14242

: 1995

Code of practice for design and construction of roof with L-Panel units

CurrentSpecializedCode of PracticeBIMStructural Engineering · Planning, Housing and Pre-fabricated Construction

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This code of practice outlines the design, manufacturing, and construction requirements for roofs and floors built using precast reinforced concrete L-shaped panel units. It covers material specifications, structural design principles, manufacturing tolerances, and on-site erection procedures, including the placement of in-situ concrete and waterproofing.

Code of practice for design and construction of roof with L-Panel units

Quick Reference Values

Minimum grade of concrete for precast L-PanelM20

Minimum grade of in-situ concrete/screedM15

Minimum nominal cover to reinforcement in panels15 mm

Minimum average thickness of structural topping/screed40 mm

Maximum design span covered in examples4.2 m

Minimum flange thickness of L-Panel30 mm

Practical Notes

Strict quality control during casting of L-panels is crucial, as dimensional inaccuracies can cause major issues during erection.

Careful handling during transportation and lifting is essential to prevent cracking or chipping of the thin precast sections.

The integrity of the roof system heavily depends on the quality of the in-situ concrete topping and the waterproofing layer, especially at the joints between panels.