A Study of Lean Construction Practices in Gaza Strip

7. Poor technology of equipment.
8. Shortage of tools and equipments required.
10. Rework due to workers’ mistakes.
11. Damage to work done caused by subsequent trades.
12. Poor workmanship.
2.8.3 Inventory
Inventory waste means having unnecessarily high levels of raw materials, work-inprogress
and finished products. Extra inventory leads to higher inventory financing
costs, higher storage costs and higher defect rates.
Inventory hides waste and defects as materials that have been fabricated and stored for
various projects, backlog of good work over jobs, a batch of engineering
recommendations, and massive amounts of data being stored for use at a later date or
never used at all.
Inventory waste of construction in the Gaza Strip is due to:
1. Wrong storage of materials.
2. Inadequate stacking and insufficient storage on site.
3. Insufficient instructions about storage and stacking.
4. Inappropriate storage leading to damage or deterioration.
2.8.4 Transportation: (Material Movement)
Transportation includes any movement of materials that does not add any value to the
product, such as moving materials between workstations. The idea is that transportation
of materials between productions stages should aim for the ideal that the output of one
process is immediately used as the input for the next process. Transportation between
processing stages results in prolonging production cycle times, the inefficient use of
labor and space and can also be a source of minor production stoppages. Unnecessarily
moving materials wastes
time, energy, resources, and increases the likelihood of injury such as moving work-inprocess
from a site to site, moving an engineering recommendation from one area to
another for review, moving pipe from location to location.
Transportation waste of construction in the Gaza Strip is due to:
1. Damage during transportation
2. Use of inadequate tools and equipments
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