Technological Efficiency of Modular Green Roof Systems for Operated Flat Roofs in Nukus Conditions

Abstract

The paper examines the technological performance of modular green roof systems for operated flat roofs under the climatic and construction conditions of Nukus. The study combined regulatory review, comparative analysis of roof alternatives, functional and organizational modeling, and chronometric observations carried out for the installation of a modular greening system. An operated roof with a total area of 324 m² was taken as the reference object, while detailed timing measurements were performed for a 10 m² installation zone. The average duration of modular installation was 3.52 h per 10 m², and the total labor input was 10.56 person-hours, which corresponds to a rational crew of three workers. Comparative calculations for six constructive-technological alternatives showed that the modular option with 0.5 m modules achieved the best overall result: 167 person-hours and 18 shifts for the full roof, versus 231–233 person-hours and 20 shifts for pedestrian hard-surface alternatives. A system of efficiency indicators was used to separate the labor contribution of the multilayer substructure from that of the greening layer. The results show that the modular solution slightly increases the labor share of the green layer itself, but compensates for this by reducing labor in the supporting roof structure, shortening the work cycle, and improving maintainability.