Roof Life Cycle Cost Analysis

Comparative life cycle assessment of standard and green roofs.

Roof life cycle cost analysis.

The problem is that different analyses provide conflicting conclusions. 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. It takes into account all costs of acquiring owning and disposing of a building or building system. Life cycle cost benefit analysis of extensive vegetated roof systems.

Life cycle cost analyses comparing several roof maintenance scenarios the technique for conducting a life cycle cost analysis has become formalized through the use of an astm method e 917 standard practice for measuring life cycle costs of buildings and building systems. In 2010 the roofing manufacturer fibertite conducted a 20 year comparison between a proposed 10 000 sq. 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. Life cycle cost analysis lcca is a method for assessing the total cost of facility ownership.

Lcca is especially useful when project alternatives that fulfill the same performance requirements but differ with respect to initial costs and. The value of green infrastructure. This analysis included extended roof life energy savings and stormwater fee reduction in the economic benefits that the green roof provided. 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.

Black asphalt roof system with a white granular surface and a premium fully adhered white membrane. To give you an example of how roof life cycle cost analysis works we have highlighted a study conducted by a major roofing manufacturer. Environmental science and technology 4312 4316. For example for a highway pavement in addition to the initial construction cost lcca takes into account all the.

Lee 2004 compared green roof and traditional roof life cycle costs over 60 years for a single roof in oregon. They found the green roof to be 7 more expensive than the conventional roof over this time. Keeler life cycle cost benefit analysis of extensive vegetated roof systems journal of environmental management vol. Many of the current claims are based upon some life cycle analysis.

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.