Better quality and variety of surface finish because panels are manufactured in controlled factory conditions. Due to sufficient experience gained of the use of concrete cladding design guides are now available on this subject. If pre-cast units are standardised economy is achieved in the production of units. Production of special units is expensive. There may be problems of stacking and delivery.
Standardised units have the following advantages.
Lower production and erection cost. Less time for detailing, mould making and production periods. Reduced risk of detailing and production errors. Reduced risk of delays due to units being damaged. Weight of unit for lifting.