Which type of staircase is preferable for frame structures: Waist slab type or folding slab type

Project:www.sefindia.org
Component:Miscellaneous
Category:support request
Priority:normal
Assigned:Unassigned
Status:active
Description

We always have a conflict between the engineers and architects and also contractors that which type of staircase to adopt. Whether it should be a waist slab type of staircase or folding type. May I request all sefians to put some light and give there opinions considering the different aspects.