# Service Life Prediction and Life Cycle Costs of Light Weight Partitions
## 5 Life Cycle Cost Analysis
### Lifecycle Cost Analysis in Standard Service Conditions
The lifecycle costs for gypsum board partitions are the lowest across the first three levels of service conditions, ranging from light to standard. It is vital to recognize the heightened sensitivity of gypsum board partitions to an increasing number of negative occupancy factors. The service life expectancy significantly diminishes with each additional factor, and this is particularly notable in the case of standard service conditions (\(2\leq\mu<4\)), where it is necessary to add a replacement every 27 years, a figure that dramatically reduces to 11 years in intensive conditions. Although derived from a linear deterioration model, this indicates a rapid decline in partition integrity in harsher conditions, while highlighting the unsuitability of the gypsum board partition in such environments. 3. Research findings suggest that hollow concrete block partitions are the most stable in various service conditions. The predicted service life of this type of partition exceeds 50 years in regular, moderate, or light service conditions. It is only in intensive service conditions that the partition service life drops below 50 years; however, even here the residual service life (service life after replacement) is 12 years (until the end of the building's lifecycle), and therefore does not justify the replacement of the partition but rather its repair. 4. Of the block partitions examined, hollow concrete block partitions, whose lifecycle costs are the highest in light or moderate service conditions, require the highest initial investment. whose 1 In standard service conditions, the lifecycle costs of concrete block partitions are similar to those of aerated concrete block partitions. In intensive service conditions, hollow concrete block partitions are the most economical choice. On the basis of the above paragraphs, the following partition choice recommendations are made:  
1. Gypsum board partitions are the most economical choice in moderate or regular service conditions (\(\mu<4\)). However, their performance level in regular service conditions is significantly lower than concrete block partitions and aerated concrete block partitions. Therefore, even at a regular service level, this partition is not a good solution if the user's planning horizon is more than 25 years. 2. Block partitions, aerated concrete block partitions and hollow concrete block partitions are the partitions best-suited to functioning in intensive service conditions (accelerated wear due to a large number of negative occupancy factors). Of the block partitions examined in this study, hollow concrete blocks have a better performance in intensive service conditions (predicted lifespan of 38 years compared to 18 for aerated concrete block partitions). Although this partition has higher initial costs (154.8 vs. 131.3), the better performance of hollow concrete block partitions means their lifecycle costs are lower than aerated concrete block partitions (169 vs. 236 ILS/m\({}^{2}\)). Therefore, hollow concrete block partitions are economically preferable in these service conditions (\(\mu\geq 4\)).