# An Expert Knowledge-Based System to Evaluate the Efficiency of Dry Construction Methods
## 3 Results
### The Analysis of the Dry Construction Potential in Finishing Construction Works
The average cost of combinations of dry and wet technologies in the technological model M3P are reduced in comparison with wet techniques in M1 by 1.6%, and compared to the average cost of dry techniques in M2P by even 13%. Although the potential of dry construction in terms of costs has not been clearly demonstrated, the results of the simulations of the technological model M2 compared to the combinations of wet techniques in the technological model M1 show increased costs, but by choosing a suitable combination of dry and wet techniques, it is also possible to achieve a reduction in construction costs. Manufacturers, sellers, and building companies expressly declare the advantage of dry construction in terms of structure weight. Figure 10 presents the total weight of partitions, ceilings, wall finishes and floors in the reference family house FH 70, for all examined technology combinations separately. For a faster and clearer evaluation, the lowest structural weights within the examined combinations of individual technological models are highlighted in dark green; the highest structural weights are in deep red. The average values of the weight parameter in technological models M1P, M2P, M3P are also highlighted in the colors corresponding to each model: models M1--blue, M2--yellow, and M3--green. Figure 9: Construction cost of different technological models of finishing works in the family house FH 70. The weight of constructions of finishing works in combinations of only wet techniques (technological model M1) is from a minimum of 22.4 tons to a maximum of 37.5 tons. The average value for M1P is 29.0 tons. The structural weight of finishing works in combinations of only dry techniques (technological model M2) is from a minimum of 7.5 tons to a maximum of 9.6 tons. The average weight in M2P is 8.2 tons. Compared to the M1 model, where only wet systems and techniques are applied, the weight is reduced by 58% to 80%. The structural weight of finishing works in combinations where wet techniques are combined with dry techniques (technological model M3) is from 8.8 tons to a maximum of 26.8 tons. The average structural weight of finishing works in the technological model M3P is 15.3 tons. By choosing only dry systems and techniques, the weight is reduced in the range of 58% to 80% of the weight of only wet techniques. As for the average weight of the M2P model with only dry techniques, there is a decrease of 72% compared to the average weight of the M1P model with only wet construction systems and techniques for finishing works. By choosing at least one finishing work performed by a dry technique, the weight can be reduced by a maximum of 30% compared to the M1 model with only wet techniques. By choosing three dry techniques in combination with one wet system or technique, the structural weight could be reduced by 61%. The average structural weight in combinations of dry and wet techniques can be reduced by 41% compared to the average weight of wet systems and techniques.