Roof System Research Articles

Research on Multi-Objective Optimization Design of University Student Center in China Based on Low Energy Consumption and Thermal Comfort

Ensuring optimal building performance is vital for enhancing student activity comfort and fostering energy-saving initiatives toward low-carbon objectives. This paper focuses on university student centers in China, aiming to diminish building energy consumption while enhancing indoor thermal comfort. Parametric modeling of typical cases is executed using the Grasshopper 1.0.0007 software package, and the simulation of building energy consumption and indoor thermal comfort relies on the Ladybug and Honeybee plug-in. Employing a multi-objective optimization design method and the Octopus multi-objective optimization algorithm, this study integrates numerical simulations and on-site surveys to analyze how factors like building form, orientation, envelope structure, and others impact the indoor and outdoor environment. A comprehensive optimization design approach is implemented for the building’s exterior components, including the walls, windows, roof, and shading system. After conducting a comparative analysis of the annual comprehensive energy consumption and indoor thermal comfort before and after the optimization plan, it is determined that implementing these measures reduces the annual comprehensive energy consumption of the building under study by 58.8% and extends the duration of indoor thermal comfort by 53.0%. This study presents a practical optimization design methodology for university student center architecture in China, aiding architects in decision making and advocating for energy-efficient building designs.

Degradation of structural safety levels in prototype balanced beam systems

Post-tensioned balanced beam structures are very sensitive to natural deterioration and excessive environmental attacks, which can lead to relatively rapid drops in safety levels. Since partial failure or corrosion of pre-stressing tendons can be difficult to detect, the strategy of last resort to ensure that safety levels are acceptable remains to perform a mechanical load test, with the risks that this entails. In the case of some iconic balanced beam systems, destructive investigations are further limited by the need to comply with the deontological standards valid for cultural heritage structures. The capacity and robustness of balanced beam systems can therefore be estimated by relying primarily on accurate mechanical models and sensitivity analyses against scenarios that may degrade safety. To this end, reference models can be corroborated by information from various sources, including experimental campaigns and archives. This study, in particular, focuses on the evaluation of the residual capacity offered by Morandi's prototype balanced beam scheme, to aid prognosis, and possibly support “decision-making” for possible reuse. Finally, an experimental and numerical application to the most complex post-tensioned concrete balanced beam system ever designed by Riccardo Morandi is presented, i.e. the roofing system of Pavilion V of Torino Esposizioni dating back to the late 1950 s.

Solar Powered Rain Roofing System For Crops With Smart Watering

Solar Powered Rain Roofing System For Crops With Smart Watering

An integrated climate-based daylight performance evaluation framework for indoor arenas' roof system

Daylight environment plays a crucial role in indoor arenas' comfort and energy performance, characterized by their large spans and large spaces. Design parameters of roof systems in these arenas are essential for enhancing the daylight within competition halls. However, due to the complexity of spatial archetypes in these halls and the unique characteristics of freeform surfaces, more research is needed on the interplay between roof system design parameters and daylight performance. Rapid evaluation of daylight performance in competition halls during the design phase remains a challenge. This study proposes a climate-based evaluation framework for assessing daylight performance in indoor arenas and integrates an efficient practical and research workflow using Rhino + Grasshopper in conjunction with Python.Further, based on this framework and workflow, controlled variable simulation experiments were conducted to explore the relationships between external design conditions, such as climate (represented by three typical climatic zones) and seating capacity, and roof system design parameters, including roof form, redundant height, orientation, skylight form, distribution, and skylight-to-floor ratio (SFR), with time-series, climate-based daylight performance indicators. To integrate the critical factors affecting indoor lighting environments in arenas - illuminance potential, glare evaluation, and uniformity assessment - this study selected Continuous Daylight Autonomy (cDA), Useful Daylight Illuminance (UDI), and Glare Autonomy (GA) as performance indicators, supplemented by two time-series climate indicators specifically for evaluating illuminance uniformity in indoor arenas: “Uniformity Autonomy (UA) “and “Uniformity Variance Autonomy (UVA) ". Statistical analysis of five performance indicators across 860 experimental models in seven groups shows that different design conditions and parameters affect the optimal range of SFR. The significance of the impact of various design parameters varies across different performance indicators. There is a strong correlation between cDA, UDI, and GA, while UA and UVA effectively supplement the evaluation of the first three indicators.

Analysing carbon impacts of green roof at Hilton Watford: life-cycle assessment approach

This paper investigates the environmental aspects and energy impacts of implementing a green roof system at the Hilton Watford hotel, utilising building information modelling software (Revit) for three-dimensional modelling and Insight for energy simulation. Following EN 15804:2012+A2:2019, the study employs life-cycle assessment methodology, focusing on embodied and operational carbon. Environmental Product Declarations, Inventory of Carbon and Energy database and the Royal Institution of Chartered Surveyors guideline inform embodied carbon calculations. The results show the green roof system releases 263 839.56 kgCO2e as embodied carbon, while its sedum layer sequesters 211 468.12 kgCO2e over a 50 year lifespan. Energy efficiency analysis indicates a 3.3 kWh/(m2/year) reduction in energy consumption, leading to a 112 130.31 kgCO2e reduction in operational carbon dioxide emissions, highlighting the environmental benefits of green roof adoption. The findings suggest a 0.35% mitigation of whole life-cycle carbon dioxide emissions, with greater impact in situations of lower insulation effectiveness, showcasing the potential of green roofs in reducing carbon dioxide emissions. Additionally, the green roof incurs a minimal financial burden, constituting only 0.51% of the overall project cost.

SICK BUILDING SYNDROME: IMPACT OF IDEAL ROOFING ON OCCUPANTS HEALTH

Sick Building Syndrome (SBS) has been defined as a “set of adverse health or discomfort symptoms that individuals experience when they spend time indoors, particularly in office buildings, and that lessen while away from the building” Apte et al. (2000). Various construction elements such as windows, floors, roof designs and construction methods can substantially increase or reduce health and safety levels. This can affect internal and external environments in workplaces. Therefore, the more sustainable the construction elements, the less hazardous or negative impacts on the building construction, the workforce, the environment, the occupants and vice versa. This study aims to use existing building construction elements and designs in North Cyprus to create a framework for developing and evaluating suitable roofing structures for adequate insulation in the North Cyprus residential buildings. This was achieved through research experiments on the construction of building elements, that is, roofing. Most SBS buildings in Cyprus have no roof structure or adequate insulation. Therefore, this experiment was carried out to prove that wrong roof systems contribute to SBS formation in buildings and the rate of SBS effects on the end users.

Operational effect of green roof systems with a modified substrate adding soda residue soil

ABSTRACT To investigate whether soda residue soil could be used as a green roof substrate, this paper setup six green roof systems with four materials (peat soil, coconut bran, perlite, and soda residue soil) mixed in different volume proportions. The effect of soda residue soil content on Sedum lineare growth and pollutant removal from the stormwater runoff was analyzed and the runoff quality index (RQI) was calculated. Results showed that the relative growth rate of S. lineare height in system B with 10% soda residue soil was about 21.5–53.2% higher than the other systems. The outflow of system B with 10% soda residue soil had the lowest mass concentration of NH4+-N and TN, which were 2.2 and 3.2 mg/L, respectively. The average repetitive rainfall retention rate of system A without soda residue soil was the lowest at 82.6%. System B had the highest RQI at about 0.71. It confirmed that soda residue soil can be a material with practical application value, and when the volume ratio of peat soil, coconut bran, perlite, and soda residue soil was 4:3:2:1, the green roof would have the best performance in regulating and purifying the initial rainwater runoff.

«Green» structures in the urbanized environment: studying the impact of «green» roofs on environmental parameters and rainwater quality. Bibliographic review

A quantitative analysis of the most cited articles published in the Scopus scientometric database by 2023 is carried out. It is shown that most of the publications, the object of study of which are "green" structures, focus on the study of "green" roofs. It is shown that since 1981, the number of studies on green roofs has been steadily increasing: approximately 45% of articles focus on the benefits in terms of thermal impact and thermal insulation, 18% on rainwater drainage, 15% on air quality, 5% on the noise-absorbing properties of green roofs, and 17% on the costs of building and operating green roofs, recreational facilities, fire protection, and other related issues. The requirements and commonly used materials for a standard green roof are described, as well as the percentage of scientific publications, depending on the functions and layers of green roof construction involved. An analysis of the most cited scientific studies on the impact of green roof systems on wastewater quality was conducted. It is shown that the results of the studies presented in these publications indicate the need for further study of the impact of a "green" roof on the amount of pollution in the water flowing from its surface. It is emphasized that further research should focus on the structural layers of the roof (thickness and materials used), namely the thickness and types of substrate layers, as well as on the conditions of plant care (e.g., fertilization), especially on intensive green roofs. In addition, it should be studied and analyzed how the retention of rainwater by plants and the soil layer of a green roof affects the relative humidity of the air near the building during periods without rain. The most cited scientific studies on the reduction of air pollutants by means of green roofs are analyzed. It is concluded that future research should focus on the study of plant species that are well adapted to growing on roofs (in temperate climates) and most effectively carry out the process of photosynthesis, absorbing CO2 and releasing O2 into the atmosphere around the building. The article analyzes the most cited scientific publications on the noise-absorbing properties of green roofs. It is substantiated that it is necessary to maximize the percentage of green roofs implementation on all buildings and structures in the city so that green roofs can significantly affect the quality of the environment in urbanized areas.

Calculation of the ecological and economic effect of collecting rainwater with «green» roofs

The problem of the availability of fresh water on the planet is substantiated and the main concepts of sustainable rainwater management, such as: "SuDS", "BMP", "LID", "GI", as well as the concept of "green" structures, are analyzed. The classification and characteristics of the main types of «green» roofs, as well as their main ecological advantages, are presented. The global market for green roofs is shown growing from USD 1.4 billion in 2020 to a CAGR of 17% from 2020 to 2027, to reach USD 4.2 billion by 2027, and is projected to the extensive type will account for more than half of the total market share. The problem of high costs for installation and maintenance of environmentally friendly solutions for the roof is highlighted, therefore the aim of the work is to calculate the ecological and economic effect of collecting rainwater obtained from "green" roofs, in contrast to traditional roofs, and to conduct an economic analysis of social and cost benefits. what green roofs generate over their life cycle using the Net Present Value (NPV) method. The ecological and economic effect of collecting rainwater with "green" roofs was calculated for four cities of Ukraine: Kyiv, Kharkiv, Dnipro and Lviv. According to the results of calculations, the ecological effect of EE ranges from 394,000 m3 in the city of Dnipro and 450,000 m3 in Kharkiv to 567,000 m3 in Kyiv and 647,000 m3 in Lviv. The difference in the obtained calculations depends primarily on the selected area of "green" roofs, which was the lowest in the city of Dnipro (1.47 million m2) and the highest in the city of Kyiv (2.50 million m2), the values of which were chosen conditionally, as well as from the indicator of the average annual amount of precipitation, which is the highest in the city of Lviv (740 mm). The average value of the ecological effect of EE in relation to water retention in the analyzed cities was calculated, which was 515,000 m3. By multiplying EE and water price, the average ECE for these 4 cities was determined to be $380,500. It was concluded that the price of water is a decisive dependent variable in the calculation of ECE. The calculation of the economic analysis of the profitability of investments in "green" roofs corresponding to 1 m2 of intensive and extensive "green" roofs, which was carried out on the basis of the net present value method (NPV). It is shown that investment costs for "green" roofs include the following stages: design of "green" roofs; installation of the "green" roof system; installation of waterproofing; production of substrate for roofs and its installation; selection and planting of plants on the roof; installation of the irrigation system. It is substantiated that both intensive and extensive "green" roofs have a positive indicator of the net present value of NPV. The average NPV per 1 m2 of an intensive "green" roof is more than 10 times higher than the average NPV per 1 m2 of an extensive "green" roof.

Evaluating the economic sustainability of commercial complex greening based on cost-benefit analysis: A case study of Singapore’s Shaw center

Commercial complex greening is the alternative to leading the greening development of public buildings, reducing the negative impact of buildings on the environment, and achieving sustainable development goals. However, the economic sustainability of commercial complex greening remains underinvestigated. This study investigated traditional building greening economic evaluation indicators and quantitative methods according to the characteristics of commercial complexes in to provide ideas on the economic evaluation of it to fill in the blanks of CBA analysis applied to the economics of greening systems of commercial buildings. Applying cost-benefit analysis, this study evaluated the economic sustainability of vertical greening systems (VGS) and green roof systems (GRS) installed on a commercial complex in Singapore using Net Present Value (NPV), Payback Period (PBP), and sensitivity analysis to quantify and integrate personal and social life cycle costs and benefits. The methodology was based on an extensive literature review in multiple fields and rational assumptions for unavailable data. The key findings were: 1) Commercial complex greening is a feasible investment. 2) VGS has a higher economic return value, whereas GRS can achieve faster payback. 3) Well-designed greening and vitality-boosting ideas bring more economic returns than tax incentives. 4) Property value improvement, maintenance cost, and fire risk reduction were sensitive factors affecting NPV, among which property value played a decisive role, especially for VGS. 5) Extensive construction and tax policies can reduce costs and improve the economy. 6) Personal benefits generated by greening are greater than social benefits. This critical case study of a commercial complex greening project provides greening developers and operators a better understanding of the economic competitiveness of commercial complex greening implementation to promote the market application and a rationale for governments to revise existing or formulate new measures to encourage the development of green industries. Although the conclusion of this study only focuses on the economic sustainability of greening in commercial complexes in Singapore due to sample size limitations, achieving a more significant localized evaluation is potential by collecting and replacing data corresponding to regions based on this research framework. Meanwhile, quantifying more economic indicators, comparing the economy of different greening modes in commercial complexes and arranging an international database about the economic sustainability of commercial complex greening are worth further exploration in the future.

Assessment of purlins with paired torsion bracing in sloped roof systems: Direct strength method approach

A Direct Strength Method based methodology has been developed by the authors for the prediction of local buckling and distortional buckling strength of purlins with paired torsion bracing. In a previous study, the methodology was presented and discussed for zero slope roof systems in by the authors. In this paper, the authors reformulated the developed methodology to include the effect of slope in the structural behavior of the roof systems. Equations have been developed for the strength prediction of sloped roof systems for simple span and multi-span interior conditions (fixed support conditions at both ends). As downslope forces are introduced to the sloped roof systems, the lateral displacement of the diaphragm is affected, and the stress distributions are impacted along the purlin cross sections. Typically, with the increase in the roof slope, the lateral diaphragm deflection decreases during which the stress distributions approach the constrained bending distribution increasing the strength. When the roof slope is increased further and the lateral deflection of the purlins moves downslope, there is a considerable decrease in the predicted strength. Therefore, for steep roof slopes, a considerable inelastic reserve capacity is observed which when accounted for will improve the predicted strength. The component stiffness method is utilized in the process, considering displacement compatibility for the calculation of the anchorage forces within the purlin system. Partial restraint of the diaphragm that is provided by the sheathing is considered in the procedure. The developed methodology herein this paper incorporates the effects of first-order and approximate second-order torsion for the prediction of the actual stress distributions along purlin cross sections. This stress distribution may significantly differ from the conventionally assumed constrained bending distributions which may result in substantial differences in the predicted local buckling and distortional buckling strengths for purlin systems.

Wind resistance performance analysis of metal roof system of the long-span integrated photovoltaic building

Wind resistance is an important factor in the operation of Building Integrated Photovoltaic (BIPV) systems, especially for long-span roofs, where lifting of the roof can result in significant economic losses. This paper proposes a periodic boundary numerical simulation method for long-span metal roof systems to address the problem of meshes and contact pairs in the numerical simulation of wind resistance. In order to calibrate the BIPV metal roof's material parameters, indoor tensile test was conducted, and the results of the global metal roof model were compared with those of the single metal roof model with periodic boundaries for verification of periodic boundary efficiency and accuracy. The wind-resistant capacity of laboratory and long-span sizes for the BIPV metal roof system are compared, and a conversion formula between them is proposed to enable the rapid calculation from the laboratory to long-span roof system. The results show that the periodic boundary is suitable for the analysis of wind resistance of the long-span BIPV metal roof. Wind resistance of the long-span BIPV metal roof system is 1.77 kPa, whereas that of the laboratory size is 4.50 kPa. According to the proposed formula, the wind-resistant capacity of the long-span metal roof can be converted from the laboratory test, which can provide technical support for the design of BIPV systems.

Study of the Characteristics of Polyurethane as a Sustainable Material used for Buildings, Polymer Composite, Biomedical, and Electronics Application

This research is focused on studying the characteristics of Polyurethane in engineering applications as a sustainable material employed for buildings and as reinforcement for polymer composite, electronics, and biomedical applications. This study discussed and reviewed papers cut across the Polyurethane Formation, Engineering Attributes of Polyurethane, and Polyurethane Applications in various fields such as Buildings, Polymer Composite Materials, Biomedical, and Electronic, which has proven that Polyurethane is a multi-functional material that has been employed in biomedical engineering used for tissue, wound treatment, breast implant, drug delivery systems. Also, it has been applied for sensors, actuators, Flexible electronics, Energy harvesters and storage, and Shape memory applications. Furthermore, its application in buildings, Polyurethane (PU) foam as an insulation material embedded in the aluminium roofing system for sustainable human comfort. This study also identifies the challenges of Polyurethane and provides sustainable solutions. In conclusion, site materials and structural application have shown excellent performance from studying the Polyurethane characteristics as embedded materials for roofing sheets.

Numerical Design and Analysis of Advanced Roof Systems in Architecture with Environmentally Friendly Low-Carbon Materials

This research explores the viability of bamboo as a green replacement for timber in building practices. Bamboo’s advantages lie in its renewability, sustainability, and resilience to disasters, despite possessing mechanical properties similar to timber. The study proposes using Finite Element Analysis (FEA) simulations, a potent instrument for designing and analyzing intricate structures under varying loads. The research explicitly employs FEA simulations to examine the application of bamboo in complex rooftop systems, using two commercial 3D CAD software—Rhino7 and Strand7. Rhino7 is responsible for 3D model creation and the member’s division into minuscule elements, whereas Strand7 is used to assign material properties, establish boundary conditions, carry out simulations, and analyze the outcomes. This research includes case studies of bamboo grid-shell structures and implements the suggested methodology. The study’s objective is to augment the scarce engineering data and to analyze bamboo as a material and the impact it can have on construction. The study’s results underscore the potential of eco-friendly, low-carbon materials, such as bamboo, in the construction industry. It also illustrates the effectiveness of FEA simulation in analyzing elaborate structures.

Biochar and vegetation effects on discharge water quality from organic-substrate green roofs

Green roofs have been increasingly used to improve stormwater management, but poor vegetation performance on roof systems, varying with vegetation type, can degrade discharge quality. Biochar has been suggested as an effective substrate additive for green roofs to improve plant performance and discharge quality. However, research on the effects of biochar and vegetation on discharge quality in the long term is lacking and the underlying mechanisms involved are unclear. We examined the effects of biochar amendment and vegetation on discharge quality on organic-substrate green roofs with pre-grown sedum mats and direct-seeded native plants for three years and investigated the key factors influencing discharge quality. Sedum mats reduced the leaching of nutrients and particulate matter by 6–64% relative to native plants, largely due to the higher initial vegetation cover of the former. Biochar addition to sedum mat green roofs resulted in the best integrated water quality due to enhanced plant cover and sorption effects. Structural equation modeling revealed that nutrient leaching was primarily influenced by rainfall depth, time, vegetation cover, and substrate pH. Although biochar-amended sedum mats showed better discharge quality from organic-substrate green roofs, additional ecosystem services may be provided by native plants, suggesting future research to optimize plant composition and cover and biochar properties for sustainable green roofs.

A Critical Review of Existing Methods to Evaluate the Performance of Nature-Based Solutions (NBS) on Commercial Roofs (CR) to Mitigate Urban Flooding

The intensity and frequency of extreme rainfall events have increased in North America and the world due to climate change. Extreme rainfall events, characterized by a heavy volume of rainfall in a short duration, have triggered the onset of urban flash floods. Over the years, flash flooding has been reported in different cities in Canada, which resulted in many losses. Subsequently, different green roofing systems have been adopted to control urban stormwater runoff as part of Nature-Based Solutions (NBS) to mitigate urban flood and build a flood-resilient city. Currently, no specific widely recognized standard or code is dedicated to determining the hydrological performance of green roofs as a whole system. Moreover, there are no test protocols to regulate the design of green roof systems in the market. A comprehensive literature review examines existing research methods adopted to evaluate influencing parameters affecting the hydrological performance of NBS-CR. The results indicate several limitations in experimental and field investigations. Consequently, to address these limitations, it is essential to formulate a multi-functional work plan to develop a standardized test method that can become a common platform for the roofing industry to test and quantify the hydrological performance of their systems.

Novel cool roofing technology system with sustainable design for attic temperature reduction

The penetration of increasing solar gain towards the building deteriorates the building's thermal quality and raises cooling demand. In particular, the roof receives the most solar gain. The roof system reformation is urged to improve the roof system's heat capacity and conserve building energy. This paper introduced a novel cool roofing system to replace the traditional roof system. The proposed novel cool roofing applications merged: (i) lightweight foam concrete, (ii) hollow concrete slab, (iii) white cooling paint and (iv) active reflective insulation system powered by solar energy. The discovery of the proposed system was evaluated with experimental chambers exposed to the outdoor environment. Under intense sunlight, the internal roof surface was 30.6 % cooler (50.5 °C to 35.0 °C). The mean attic temperature achieved was 33.9 °C under a field where the daily maximum recorded surrounding temperature is 43.0 °C. In contrast with a bare roof at 41.9 °C, the proposed design demonstrated a 19.2 % lower solar gain, achieving a sub-ambient structure. Besides that, the cooling demand simulation generated similar cooling demand savings (20 %). Significantly, this comprehensive cool roofing system exhibited a considerable and constructive outcome in cooling the buildings by achieving sustainable development to create a better and more environmental future for all.

Earlier Flowering Phenology and Pollinator Visitation on Urban Green Roofs Compared to Ground-Level Gardens

Urban green space, green infrastructure, and horticultural installations are gaining recognition for their potential to foster biodiversity. Green roofs are challenging growing environments for plants, characterized by extreme substrate temperatures, high light intensity, limited moisture availability, and limited substrate depth. Plants have a variety of physiological responses to these unique conditions, but little is known about how green roof growing conditions affect ecological characteristics like plant flowering phenology. Meanwhile, studies are only just uncovering the degree to which green roofs can provide habitat and support urban pollinator biodiversity. We evaluated the flowering phenology and made in situ pollinator observations of 15 plant taxa growing both on green roof systems and at ground level in Denver, Colorado, over two growing seasons. We found that flowering phenology occurs substantially earlier on green roofs compared to ground level among the observed plant taxa and observed a greater number of pollinators on green roofs early in the season, compared to ground level, presumably due to the availability of floral resources among the observed plant taxa. We observed significantly higher substrate temperatures along with wider diurnal temperature amplitude during the growing season that may contribute to the observed phenological patterns. Divergence in flowering phenology between individual plants of the same species on green roofs and plants at ground-level may have implications for organisms that rely on floral resources in urban environments. Earlier flower initiation on green roofs may provide pollinators with unique foraging opportunities and aid targeted conservation where early-season floral resources are limited.

A New Look on Standard Methods of a Daylight Factor Design under Systems of Side or Roof Daylighting

The article presents a review and analysis of normative formulas, which are used in the time being in our country for daylighting of interiors design. The absence of unification in the formulas considered is being noted. The division of external daylighting systems was conducted few decades ago mechanically too, only due to the position of light openings in building in form of windows or monitors. Additionally, it was shown that luminance spreading cloudy CIE sky vault has a quantitative, not a qualitative, character. That’s why the elaboration of a new, unified design formula is needed instead of two separate formulas for side and roof systems of daylighting, having different structures of scientific content. The number of conclusions, as a result of scientific investigations, and some perspective directions of future scientific studies were being offered.

Tolerance of Tall Fescue (Festuca arundinacea Schreb.) Growing in Extensive Green Roof Systems to Saline Water Irrigation with Varying Leaching Fractions

As urbanization intensifies environmental challenges in contemporary cities, widespread green roof installations emerge as a potential solution. This study explores irrigating tall fescue (Festuca arundinacea Schreb.) turfgrass with saline water in extensive green roof systems, aiming to conserve freshwater resources. The objectives include determining the period of saline water tolerance and identifying the leachate electrical conductivity threshold affecting tall fescue’s green coverage. This greenhouse study comprised 24 lysimeters equipped with extensive green roof layering. Treatments included three NaCl irrigation solutions with an electrical conductivity of 3 dS m−1, 6 dS m−1, and 9 dS m−1, while tap water served as the control. Additionally, irrigation treatments were applied at two different regimes, resulting in an average leaching fraction of 0.3 for the low irrigation regime and 0.5 for the high irrigation regime. Tall fescue’s tolerance to saline water was evaluated through the determination of green turf cover (GTC) as well as the clipping dry weight and the leachate electrical conductivity (ECL) draining from the lysimeters. It was found that tall fescue turfgrass growing in extensive green roof systems can tolerate irrigation with water of electrical conductivity up to 9 dS m−1 for extended periods, approximating three months, without GTC declining below 90%, provided that a minimum leaching of 30% is maintained. Furthermore, irrigating with water at 9 dS m−1 resulted in a 24.5% reduction in cumulative clipping dry weight over the four-month study period. The regression analysis between GTC and ECL highlighted a substantial decline in GTC when ECL surpassed the critical threshold of 12.5 dS m−1.