ZEMCH 2015 - International Conference Proceedings | Page 347
Table 3: The data of the consumption and material waste (based on suggested changes)
Consumption
Waste
Applied
Total
Total
Format
Entire
Total
Entire
volume
volume
volume
variations
boards
waste
boards
(m³)
(m³)
(m³)
Components
OSB boards
(9,5x120x300 mm)
Cementitious boards
(8x120x300 mm)
Gypsum boards
(12,5x120x300 mm)
Studs (38x89x300 mm)
95
3,249
6
2,980
87
0,269
8%
37
1,066
8
1,030
36
0,036
3%
65
2,925
9
2,400
53
0,525
18%
141
1,692
0
1,690
0
0,000
0%
A reduction in consumption and material waste was identified, especially regarding cementitious
and OSB boards. T he consumption of cementitious boards showed a reduction of almost 10%,
while the waste was reduced by 25% (Table 4). These results indicate that the adopted solutions
allowed a better use of the boards, which resulted in a significant material saving in the production of a housing unit. The reduction of consumption and material waste corresponds to an
advantage even greater when considered the economies of scale in the production of a greater
number of dwellings. In addition, there was a significant reduction in the formats variations of
cementitious and gypsum boards. The reduction of component variance is a prerequisite for the
reduction of costs, since the rationalisation of the board cutting process reduces the time of labor
and/or use of machinery.
Table 4: Summary of the case study results
Components
OSB boards
(9,5x120x300 mm)
Cementitious boards
(8x120x300 mm)
Gypsum boards
(12,5x120x300 mm)
Studs (38x89x300 mm)
Material waste
Material waste
(based on sugested changes)
Total
Total
Total
Format Entire
Total
Format Entire
volume
volume
waste
waste variations boards
variations boards
(m³)
(m³)
10
11
0,039
11%
6
8
0,269
8%
18
5
0,141
12%
8
1
0,030
3%
16
12
0,525
18%
9
12
0,525
18%
0
0
0
0%
0
0
0
0%
It is possible to observe that there was no change in gypsum boards waste. However, there was a
reduction in the boards’ variety formats, which did not cause impacts in the material waste. Once
an analysis of these boards’ use has not been done, the next step in the product design development is to combine the reduction of waste of both components (OSB and cementitious boards).
As both boards are on the opposite sides of the wall panels, a detailed analysis must be done for
the gypsum board. The amount of wood waste also remained unchanged. Since the studs are
fully used in the panel’s composition, there is no material waste.
Reducing waste in the construction of light wood frame low-income housing
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