Study of the Causes and Magnitude of Wastage of Materials on Construction Sites in Jordan

Table 2

Ranking of causes of wastage.

Cause of wastage	F.I	S.I	I.I	Rank
Frequent design and client’s changes	74.21	74.84	55.54	1
Rework due to workers mistakes	73.56	74.33	54.68	2
Poor contract documents	72.63	72.15	52.40	3
Wrong and lack of storage of materials	71.84	70.65	50.75	4
Poor strategy for waste minimization	70.01	70.23	49.17	5
Shortage and lack of experience of skilled workers	69.66	69.69	48.55	6
Poor site conditions	70.01	68.52	47.97	7
Damage during transportation	69.92	67.53	47.22	8
Theft and vandalism	68.50	68.35	46.82	9
Mistakes in quantity surveying and overallowance	68.11	67.25	45.80	10
Poor quality and nonavailability of equipment	67.79	66.34	44.97	11
Weather conditions	68.02	65.89	44.82	12
Waste resulting from poor packaging	67.59	65.31	44.14	13
Leftover material on site	66.15	66.02	43.67	14
Wrong handling of materials	65.13	65.42	42.61	15
Poor quality of materials	64.25	65.12	41.84	16
Ordering errors	63.70	65.32	41.61	17
Purchasing materials not complying with specifications	63.01	64.26	40.49	18
Supply in loose form	61.98	65.06	40.32	19
Complicated design	61.88	64.39	39.84	20
Damage caused by workers due to lack of experience	60.25	64.23	38.70	21
Long project duration	58.96	63.48	37.43	22
Unnecessary material handling	58.46	62.34	36.44	23
Change in material prices	57.44	62.18	35.72	24
Interaction between various specialists	56.31	55.98	31.52	25