waffle slab or Flat Grid Advantages & Dis-advantages

Waffle pod slabs are widely used as the preferred slab system by many builders, whilst many people have heard of a waffle pod slab few actually know what one is.

I- Advantages:

• Waffle slabs are able to carry heavier loads and span longer distances than flat slabs as these systems are light in weight.

• Suitable for spans of 7m – 16m ; longer spans may be possible with posttensioning.

• It is also economical as the amount of concrete and steel is reduced as compared to flush slabs. Saving 15% concrete and 10% steel as compared to traditional T beams.

• These systems are light in weight and hence considerable saving is ensured in the framework as light framework is required.

• Coffered underside is usually left exposed for visual appearance.

II- Dis-advantages:

• Construction requires strict supervision and skilled labour.

• The casting forms or moulds required for pre- cast units are very costly and hence only economical when large scale production of similar units are desired.

• Headroom is reduced , hence increased storey height.

• Due to waffle ceiling , it creates problem in lighting facilities and hanging pipes or ducts.