Roof Life Cycle Cost Analysis

The value of green infrastructure.

Roof life cycle cost analysis.

Life cycle cost benefit analysis of extensive vegetated roof systems. In addition to initial installed costs maintenance costs and major renovation costs variables that factor into a life cycle cost calculation are if relevant. Life cycle cost analysis lcca is a tool to determine the most cost effective option among different competing alternatives to purchase own operate maintain and finally dispose of an object or process when each is equally appropriate to be implemented on technical grounds. Disposal costs the energy savings incurred by installing a lighter colored roof and any state city or utility rebates offered for installing energy efficient roof systems.

The problem is that different analyses provide conflicting conclusions. Keeler life cycle cost benefit analysis of extensive vegetated roof systems journal of environmental management vol. Life cycle cost analysis lcca is a method for assessing the total cost of facility ownership. This analysis included extended roof life energy savings and stormwater fee reduction in the economic benefits that the green roof provided.

Many of the current claims are based upon some life cycle analysis. Lcca is especially useful when project alternatives that fulfill the same performance requirements but differ with respect to initial costs and. Environmental science and technology 4312 4316. It takes into account all costs of acquiring owning and disposing of a building or building system.

They found the green roof to be 7 more expensive than the conventional roof over this time. Lee 2004 compared green roof and traditional roof life cycle costs over 60 years for a single roof in oregon. For example for a highway pavement in addition to the initial construction cost lcca takes into account all the. To give you an example of how roof life cycle cost analysis works we have highlighted a study conducted by a major roofing manufacturer.

Black asphalt roof system with a white granular surface and a premium fully adhered white membrane. To determine the contributions of maintenance and roofing improvement on life cycle cost the analysis period is based on a green roof s service life of 40 years. A period of 40 years for a roofing system may seem long for an economic analysis given the uncertainties in simulating building energy use but life cycle cost analyses for 30 50. A complete life cycle analysis as defined in astm e 917 standard practice for measuring life cycle costs of buildings and building systems would encompass all relevant costs over a designated study.

Comparative life cycle assessment of standard and green roofs.