ZEMCH 2015 - International Conference Proceedings | Page 345

of material acquired from the material applied. The waste was divided by the unit volume of the
board to get the number of entire boards wasted (Table 2). Furthermore, it was possible to identify and quantify the variations of the boards used for each kind of material.
Table 2: The data of the consumption and material waste - Case Study
Consumption
Components
OSB boards
(9,5x120x300 mm)
Cementitious boards
(8x120x300 mm)
Gypsum boards
(12,5x120x300 mm)
Studs (38x89x300 mm)

Waste

Applied
Total
Total
Format
Entire
Total
Entire
volume
volume
volume
variations
boards
waste
boards
(m³)
(m³)
(m³)
99

3,386

10

3,000

11

0,386

11%

41

1,181

18

1,040

5

0,141

12%

65

2,925

16

2,400

12

0,525

18%

145

1,421

0

1,420

0

0,000

0%

From these results, were identified savings opportunities through a revision in the boards modulation (sheathing and finishing). In order to reduce the variation in the formats of the boards
applied in panels with an opening, a standard setting was adopted for the installation of external finishing boards. The focus for the application of such standardization was the cementitious
board since it corresponds to the higher-value material of the system. This standard setting is
particularly important when considering the scale economies since social housing projects involve the production of a lot of units. The three-dimensional modelling showed that the panels’
connections were also responsible for the wide amount of finishing boards’ formats variations
and waste. The use of a finishing board in the corner connections for the external panels was the
standardized solution to eliminate this kind of waste. A finishing (cimentitious board) of 15 x 300
centimetres was adopted in the corner connections (Figure 9).

Figure 9: Standard setting of finishing boards on panels with openings

Reducing waste in the construction of light wood frame low-income housing

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