SL. No. Pre Engineered Buildings (PEBs) Conventional Steel Buildings
1 PEB frames are normally tapered and often have flanges and webs of variable thicknesses & depth along the individual members In conventional steel buildings mill-produced hot rolled sections (beams and columns) are used. The size of each member is selected on the basis of the maximum internal stress in the members.
2 PEBs are on an average about 30% lighter due to efficient design and use of steel. Standard hot rolled “I” or “C” sections are used, which are in many segments much heavier than what is actually required as per design.
3 Fast, efficient designing and detailing due to well defined international codes and standard by using specialized software. Each conventional structure is designed from scratch by the consultant with fewer design aids available.
4 Detailed structural drawings including erection and sheeting are provided free of cost, thereby considerably reducing erection & sheeting time. An extensive amount of consultant’s time is devoted to designing , drafting & detailing of the structure.
5 All structures are manufactured in the factory under strict quality control environment, thereby ensuring superior quality & finish. Structures are mostly site fabricated whereas, it is difficult to monitor & control quality parameters.
6 Easier sourcing & co-ordination due to single source responsibility as the entire building along with all the sheeting & accessories is designed, supplied & erected. Multiple sources for different items are involved, thereby causing considerable expenditure & delay.
7 Superior architectural features can be incorporated and excellent aesthetics can be achieved Limited scope for architectural & aesthetic features,
8 Easier to incorporate future expansions due to modular nature of design More difficult to incorporate expansions,
9 Single source of supply results in efficient time and cost management for a speedy construction. Multiple sources/ responsibilities can lead to many questions and lack of corporation.
10 Faster completion time – as civil works can be completed at the same time. Much slower completion time, exact date could not be given as it is dependent on various other concepts.
11 Cost per SQM is about 30% cheaper than conventional structures Cost is higher due to higher consumption of steel and other co-ordination issues involved.
12 There is no field welding. All the members are connected together by bolting. Which lead to speed erection All connections are field welding that consumes more time.