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 345