Roof material purchasing system

Abstract

To solve the problem that it takes time and labor to calculate a purchase amount for purchasing a roof material from a roof owner when the roof of a building having a slope is demolished.SOLUTION: According to the present invention, a roof material purchasing system for roof materials and roof members constructed on the roof of a building having a slope is provided with a roof database, a roof material / roof member master, and a roof material purchasing system input screen. A roof ID for specifying a roof, roof materials and roof members for each roof, a quantity of the roof materials and the roof members, and construction date data are registered in the roof database; a roof material design useful life, a roof member design useful life, and sales unit price data of the roof material and the roof member are registered in the roof material / roof member master; and the roof ID and scheduled purchase date are input to a roof material purchasing system input screen and the purchase amount of the roof material and the roof member is output by performing arithmetic processing.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] This invention is a roofing material buying system in which, when a roofing material is installed on a sloped roof of a building and the roof is demolished for reasons such as rebuilding the building, the process of removing the roofing material from the roof and buying the roofing material from its owner is processed by a computer. The roofing material purchasing system is provided with a roof database, a roofing material / roof component master, and a roofing material purchasing system input screen, wherein the roof database registers a roof ID identifying the roof, and data on the roofing material, roof component, quantity of the roofing material and roof component, and construction date for each roof, and the roofing material / roof component master registers the roofing material design useful life and roof component design useful life, and sales price data for the roofing material and roof component, and the roofing material purchasing system input screen registers the roof ID and planned purchase date, and the roofing material purchasing system outputs the purchase price for the roofing material and roof component by performing calculations. In the past, when a building was rebuilt, the roof on which the roofing materials were installed was demolished along with the building, and the roofing materials were disposed of as industrial waste. However, by using the technology of this invention, the current value of the roofing materials can be easily evaluated using a computer system, and the materials can be purchased from their owners, making it possible to reuse the roofing materials without having to dispose of them. By using this technology, it is possible to simplify the distribution method of roofing materials in accordance with a circular economy that minimizes resources and waste generation, rather than the conventional linear economy that uses large amounts of resources and generates large amounts of waste. [Background technology]

[0002] Prior art Patent Document 1 includes a home inspection system and a home inspection method disclosed in Japanese Patent Laid-Open Publication No. 2001-306669. In this patent document, in response to the problem of presenting appropriate information to customers regarding maintaining the performance and functionality of a home, it is proposed to provide a home inspection system including a first database storing the individual specifications of each part, component, and material of each building for each customer, a second database storing deterioration information indicating the standard deterioration state over time for each part, component, and material that constitutes the building and diagnostic information for diagnosing the deterioration information, a means for identifying a specific building in the first database, a first extraction means for extracting the individual specifications of the parts, components, and materials of the identified building from the first database, a second extraction means for extracting from the second database deterioration information and diagnostic information of the parts, components, and materials corresponding to the individual specifications of the extracted parts, components, and materials, and a means for outputting the deterioration information and diagnostic information of the extracted parts, components, and materials. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-127092 A Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the deterioration diagnosis system is a system in which the deterioration state of the members and parts to be diagnosed in advance (how long the function, performance, and design will be maintained in the future, when maintenance should be performed, and the state associated with the lifespan, etc., and information representing them) is converted into data for each part, member, and material and for each lapse of time since construction in the form of numerical values, graphs, photos, sounds, and text, and the deterioration of the customer's building is diagnosed using this data. In addition, various information and data regarding the customer's building are also organized. This includes the materials and structures of each part of the customer's building, which are associated with the data indicating the deterioration state described above. Furthermore, the methods of repair and renovation for each part of the existing building, as well as information on the construction of the repairs and renovations, and the costs thereof are also associated using the above-mentioned respective data and the concept of the part. Using these various data, the deterioration of the building is diagnosed, and further developed into the construction of the repairs and renovations and even estimates for the construction. However, conventional technology involves diagnosing the deterioration of a customer's roof by using data on roofing materials that have been installed on the building over the years since installation, and there was an issue with this system being unable to evaluate the purchase value of the installed roofing materials. In addition, with conventional technology, it was only possible to calculate the costs of repairs and renovations based on a diagnosis of the building's deterioration state, and it was not possible to accurately grasp not only the current value of the roofing materials but also the amount of roofing materials being used, which meant that it was not possible to accurately calculate the purchase price of the roofing materials.

[0005] The present invention provides a roofing material purchasing system for roofing materials and roof components installed on sloped roofs of buildings, the roofing material purchasing system comprising a roof database, a roofing material / roof component master, and a roofing material purchasing system input screen, the roof database registering a roof ID identifying the roof, and data on the roofing material, roof components, quantities of the roofing materials and roof components for each roof, and installation dates, the roofing material / roof component master registering roofing material design useful lives and roof component design useful lives, and sales price data for the roofing materials and roof components, the roofing material purchasing system input screen inputting the roof ID and planned purchase date, and the roofing material purchasing system outputting purchase prices for the roofing materials and roof components by performing calculations. [Means for solving the problem]

[0006] The roofing material purchasing system of the present invention described in claim 1 is a roofing material purchasing system for roofing materials and roof components installed on the roofs of buildings with slopes, the roofing material purchasing system comprising a roof database, a roofing material / roof component master, and a roofing material purchasing system input screen, the roof database registering a roof ID identifying the roof, the roofing material, the roof component, the quantity of the roofing material and the roof component for each roof, and the installation date data, the roofing material / roof component master registering the roofing material design useful life and roof component design useful life, and the sales price data for the roofing material and the roof component, the roof ID and the planned purchase date are input into the roofing material purchasing system input screen, and calculation processing is performed by the roofing material purchasing system, whereby the purchase price of the roofing material and the roof component is output.

[0007] The present invention described in claim 2 is characterized in that, in the roofing material purchasing system described in claim 1, the roof database registers environmental impact degradation coefficient data for each roof depending on the location conditions, and the environmental impact degradation coefficient data is added to the calculation processing.

[0008] The present invention described in claim 3 is characterized in that, in the roofing material purchasing system described in claim 1 or claim 2, roof appearance evaluation data is added to the calculation processing by inputting roof appearance evaluation data into the roofing material purchasing system input screen.

[0009] The present invention as set forth in claim 4 is characterized in that, in the roofing material purchasing system as set forth in claim 1, data of a roofing material allocation drawing in which the roofing materials are allocated to the roof is registered. Effect of the Invention

[0010] According to the roofing material purchasing system of the present invention, in a roofing material purchasing system for roofing materials and roof components installed on sloped roofs of buildings, the roofing material purchasing system is provided with a roof database, a roofing material / roof component master, and a roofing material purchasing system input screen, and the roof database registers a roof ID identifying the roof, and data on the roofing material, roof component, quantity of the roofing material and roof component for each roof, and construction date, and the roofing material / roof component master registers the roofing material design useful life and roof component design useful life, and sales price data for the roofing material and roof component, and by inputting the roof ID and planned purchase date into the roofing material purchasing system input screen and performing calculations in the roofing material purchasing system, the purchase price of the roofing material and roof component is output. In the present invention, when an application is made for the purchase of roofing materials, the roofing material purchase system performs calculations using the roof ID, making it possible to output a simple purchase price that accurately reflects the current value of roofing materials and roof components, taking deterioration into account. By referencing the construction data from the roof database, the purchase price can be calculated per unit of roof, resulting in a more accurate purchase price. Conventionally, when a building was rebuilt, the roof on which the roofing materials were attached was demolished along with the building, and the roofing materials and roofing components were disposed of as industrial waste, but by implementing the purchase system of this invention in the roofing industry, the present value of roofing materials that have been all disposed of up until now can be easily evaluated by a computer system and the materials can be purchased from their owners. The purchased roofing materials and roof components can be newly sold and distributed as refurbished roofing materials by subjecting the surfaces to cleaning and surface treatment. The present invention makes it possible to simplify the distribution method of roofing materials in accordance with a circular economy that minimizes resources and waste generation, instead of the conventional linear economy that uses large amounts of resources and generates large amounts of waste. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a flow diagram of data input into a roof database according to an embodiment of the present invention; [Diagram 2] Flow diagram of a roofing material purchasing system according to an embodiment of the present invention [Diagram 3] Flow diagram of a roofing material purchasing system according to another embodiment of the present invention. [Figure 4] Flow diagram of a roofing material purchasing system according to another embodiment of the present invention. [Diagram 5] Flow diagram of a roofing material purchasing system according to another embodiment of the present invention. [Figure 6] A roof framing diagram of a roof material and a roof component according to an embodiment of the present invention. [Figure 7] Roof material layout diagram according to an embodiment of the present invention DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The roofing material purchasing system in the first embodiment of the present invention is a roofing material purchasing system for roofing materials and roof components installed on sloped roofs of buildings, the roofing material purchasing system is provided with a roof database, a roofing material / roof component master, and a roofing material purchasing system input screen, the roof database registers a roof ID identifying the roof, and data on the roofing material, roof components, quantities of the roofing materials and roof components for each roof, and installation dates, the roofing material / roof component master registers the roofing material design useful life and roof component design useful life, and sales price data for the roofing materials and roof components, the roof ID and planned purchase date are input into the roofing material purchasing system input screen, and calculations are performed by the roofing material purchasing system to output the purchase prices of the roofing materials and roof components. According to this embodiment, when an application is made to purchase roofing materials, the roofing material purchasing system performs calculations using the roof ID, making it possible to output a simple purchase price that accurately reflects the current value of roofing materials and roof components, taking deterioration into account. By referencing the construction data from the roof database, the purchase price can be calculated per unit of roof, resulting in a more accurate purchase price. Conventionally, when a building was rebuilt, the roof on which the roofing materials were attached was demolished together with the building, and the roofing materials and roofing components were disposed of as industrial waste, but by implementing the purchase system of the present invention in the roofing industry, the present value of roofing materials that have been all disposed of up until now can be easily evaluated by a computer system and the materials can be purchased from their owners. The purchased roofing materials and roof components can be newly sold and distributed as refurbished roofing materials by subjecting the surfaces to cleaning and surface treatment. The present invention makes it possible to simplify the distribution method of roofing materials in accordance with a circular economy that minimizes resources and waste generation, instead of the conventional linear economy that uses large amounts of resources and generates large amounts of waste.

[0013] The second embodiment of the present invention is a roofing material purchasing system according to the first embodiment, in which environmental impact degradation coefficient data for each roof depending on location conditions is registered in the roof database, and the environmental impact degradation coefficient data is added to the calculation processing. According to this embodiment, the difference in deterioration that each roof experiences depending on its location conditions is converted into an environmental impact deterioration coefficient and registered in the roof database at the time of roof construction, making it possible to more accurately calculate the evaluation of the deterioration of roofing materials and roof components over time using the aging time and environmental impact deterioration coefficient data.

[0014] The third embodiment of the present invention is a roofing material purchasing system according to the first or second embodiment, in which roof appearance evaluation data is added to the calculation processing by inputting roof appearance evaluation data into the roofing material purchasing system input screen. According to this embodiment, by inputting roof appearance evaluation data into the input screen of the roofing material purchase system, the evaluation results of deterioration over time calculated by the system for roofing materials and roof components can be confirmed and further corrected using the current roof appearance evaluation data. The effect of the present invention is particularly significant when the environment of the roof has changed significantly since construction.

[0015] A fourth embodiment of the present invention is a roofing material purchasing system according to the first embodiment, in which the roof database has registered therein data of a roofing material allocation drawing showing the roofing materials allocated to the roof. According to this embodiment, roof material allocation drawings can be referenced from the roof purchase system as data related to roof construction, making it possible to efficiently remove roof materials. As a result, it becomes possible to provide economic benefits to the buyer, such as increasing the purchase price by reducing the hassle of removal. In addition, having a roofing material layout drawing makes it possible to purchase cut-and-processed roofing material at the edge of the roof, which increases the purchase price of roofing material per roof. As a result, the refurbishment rate of roofing materials and roof components can be increased, making the system more suitable for a circular economy. EXAMPLES

[0016] A roofing material buying system according to an embodiment of the present invention will now be described. FIG. 1 is a flow diagram of data input into a roof database according to an embodiment. In the roofing material buying system 4 of this embodiment, the buying price 15 can be calculated simply and efficiently by using a roof database 5 in which construction data for the roof 1 is recorded. FIG. 1 is a flow diagram of a method for inputting construction data for a roof 1 into the roof database 5, and two representative data input methods are shown in FIG. 1(a) and FIG. 1(b). In Figure 1(a), data is input into the roof database 5 through two steps: a roof work estimate step and a roof work step. In the roof construction estimate step, the roof material purchasing system input screen 7 is used to input data such as the roof ID 8, property name, contractor name, roof shape, roof dimensions, slope, roof material 2, and roof component 3. Using these data and the layout drawing / component estimation database, the computer system performs calculations for the estimation of the roof material 2 and roof component 3 and the allocation of the roof material 2, and the output quantities 9 of the roof materials and roof components and the roof material layout drawing 18 are input into the roof database 5. In addition, roof material allocation diagram 18, material cost estimate table, roof estimate, etc. are output as part of the roof construction estimate step. The next step is the roof construction step. The roof construction step is the step after accepting the roof construction order by presenting the roof construction estimate etc. At the time of carrying out roof construction work, data such as the roof ID 8, construction date 10, and environmental impact deterioration coefficient 16 are entered using the roofing material purchase system input screen 7. The environmental impact deterioration coefficient 16 is a parameter that estimates the degree of deterioration based on the location conditions of the property on which the roof is being constructed. For example, the degree of deterioration varies depending on the location conditions, such as the effect of salt damage being greater near the coast and the fact that it is more likely to become dirty near a major road, so the deterioration effects due to these environments are set. The necessary roof data is input to the roof database 5 by combining the input data in this roof construction step, the input data in the roof construction estimate step, and the output data calculated by the computer system. In the roof database 5, the name of the construction company that actually constructed the roof 1 can also be identified by the roof ID 8, so that it is also possible to check the construction records with the construction company. FIG. 1(b) shows a flow for only the roof construction step, in which data is input into the roof database 5 using the roofing material purchasing system input screen 7 at the time of roof construction. By entering the roof ID 8, property name, construction company name, roof shape, roof dimensions, slope, construction date 10, roof material 2, roof component 3, quantity of roof materials and roof components 9, environmental impact degradation coefficient 16, and roof material allocation drawing 18 into the roof material purchasing system input screen 7, the roof construction data for each roof 1 is input into the roof database 5.

[0017] FIG. 2 is a flow diagram of a roofing material purchasing system according to an embodiment. In this embodiment, the first step is to input the roof ID 8 and the planned purchase date 14 into the roofing material purchase system input screen 7 . However, when using date data in a computer system, it is also possible to input data for planned purchase date 14 by quoting the date data when roof ID 8 was entered. By inputting the roof ID 8, the roof construction data is referenced from the roof database 5. In this embodiment, the roof material 2, roof component 3, quantity 9 of roof materials and roof components, and construction date 10 are output from the roof database 5 as data for the roof 1 registered as the roof ID 8. By inputting the data of roof material 2 and roof component 3 output from roof database 5 into roof material / roof component master 6, data of roof material design useful life 11 corresponding to roof material 2, roof component design useful life 12 corresponding to roof component 3, and roof material and roof component sales price 13 are output from roof material / roof component master 6. The quantity 9 of roofing materials and roof components and construction date 10 output from the roof database 5, the roofing material design useful life 11, roof component design useful life 12, roofing material and roof component sales price 13 output from the roofing material and roof component master 6, and the planned roof purchase date 14 input from the roofing material purchase system input screen 7 are input into the roofing material purchase system 4, and a computer system performs calculations to output the purchase price 15 of the roofing materials 2 and the roof components 3.

[0018] FIG. 3 is a flow diagram of a roofing material purchasing system according to another embodiment. The other embodiment in FIG. 3 is different from the embodiment in FIG. 2 in that environmental impact deterioration coefficient data 16 is stored in the roof database 5. Specifically, as a first step, the roof ID 8 and the planned purchase date 14 are entered into the roofing material purchase system input screen 7 . However, when using date data in a computer system, it is also possible to input data for planned purchase date 14 by quoting the date data when roof ID 8 was entered. By inputting the roof ID 8, the roof construction data is referenced from the roof database 5. In this embodiment, the data of the roof 1 registered as the roof ID 8 is output from the roof database 5, including the roof material 2, roof component 3, quantity 9 of the roof material and roof component, construction date 10, and environmental impact deterioration coefficient data 16. By inputting the data of roof material 2 and roof component 3 output from roof database 5 into roof material / roof component master 6, data of roof material design useful life 11 corresponding to roof material 2, roof component design useful life 12 corresponding to roof component 3, and roof material and roof component sales price 13 are output from roof material / roof component master 6. The quantity 9 of roofing materials and roof components, construction date 10, and environmental impact deterioration coefficient data 16 output from the roof database 5, the roofing material design useful life 11, roof component design useful life 12, roofing material and roof component sales price 13 output from the roofing material and roof component master 6, and the planned roof purchase date 14 input from the roofing material purchase system input screen 7 are input into the roofing material purchase system 4, and a purchase price 15 of the roofing materials 2 and the roof components 3 is output by calculation processing by the computer system. When the roof material 2 is first installed, the environmental impact degradation coefficient data 16 due to the location conditions of the roof 1 is input to the roof database 5, and the environmental impact degradation coefficient data 16 is added to the calculation process. The age of the roof material 2 and roof component 3 is calculated from the construction date 10 and the planned purchase date 14, and the age, the roof material design useful life 11, the roof component design useful life 12, and the environmental impact deterioration coefficient data 16 are processed by a computer system, so that a purchase price that takes into account the age deterioration can be output more accurately.

[0019] FIG. 4 is a flow diagram of a roofing material purchasing system according to another embodiment. Another embodiment in FIG. 4 is an embodiment in which roof appearance evaluation data 17 is added as input data to the embodiment in FIG. Specifically, as a first step, the roof ID 8, the planned purchase date 14, and the roof appearance evaluation data 17 are input into the roofing material purchase system input screen 7. However, when using date data in a computer system, it is also possible to input data for planned purchase date 14 by quoting the date data when roof ID 8 was entered. By inputting the roof ID 8, the roof construction data is referenced from the roof database 5. In this embodiment, the data of the roof 1 registered as the roof ID 8 is output from the roof database 5, including the roof material 2, roof component 3, quantity 9 of roof materials and roof components, construction date 10, and environmental impact deterioration coefficient data 16. By inputting the data of roof material 2 and roof component 3 output from roof database 5 into roof material / roof component master 6, data of roof material design useful life 11 corresponding to roof material 2, roof component design useful life 12 corresponding to roof component 3, and roof material and roof component sales price 13 are output from roof material / roof component master 6. The quantity 9 of roofing materials and roof components, construction date 10, and environmental impact deterioration coefficient data 16 output from the roof database 5, the roofing material design useful life 11, roof component design useful life 12, and roofing material and roof component sales price 13 output from the roofing material and roof component master 6, and the planned roof purchase date 14 and roof appearance evaluation data 17 input from the roofing material purchase system input screen 7 are input into the roofing material purchase system 4, and a purchase price 15 for the roofing materials 2 and the roof components 3 is output by processing the data by a computer system. In this embodiment, by inputting roof appearance evaluation data 17 into the roofing material buying system input screen 7, the evaluation results of aging deterioration calculated and output by the roofing material buying system 4 can be compared with the current roof appearance evaluation data 17, and the evaluation results of aging deterioration can be revised as necessary. The effect of the present invention becomes particularly noticeable when the environmental conditions at the location of the roof 1 have changed significantly since the time of construction. Unlike this embodiment, even in cases where environmental impact deterioration coefficient data has not been input into the roof database 5, the roof appearance evaluation data 17 inputted on the roof material purchase system input screen 7 is used to calculate deterioration over time, and the purchase price 15 of the roof material 2 and the roof component 3 is outputted by a computer system that processes the deterioration over time.

[0020] FIG. 5 is a flow diagram of a roofing material purchasing system according to another embodiment. The other embodiment in FIG. 5 is different from the embodiment in FIG. 2 in that a roof material allocation drawing 18 is stored in the roof database 5. Specifically, as a first step, the roof ID 8 and the planned purchase date 14 are entered into the roofing material purchase system input screen 7 . However, when using date data in a computer system, it is also possible to input data for planned purchase date 14 by quoting the date data when roof ID 8 was entered. By inputting the roof ID 8, the roof construction data is referenced from the roof database 5. In this embodiment, the data of the roof 1 registered as the roof ID 8 is output from the roof database 5, including the roof material 2, roof component 3, quantity 9 of roof materials and roof components, construction date 10, and a roof material allocation drawing 18. By inputting the data of roof material 2 and roof component 3 output from roof database 5 into roof material / roof component master 6, data of roof material design useful life 11 corresponding to roof material 2, roof component design useful life 12 corresponding to roof component 3, and roof material and roof component sales price 13 are output from roof material / roof component master 6. The quantity 9 of roofing materials and roof components, construction date 10, and roofing material allocation drawing 18 output from the roof database 5, the roofing material design useful life 11, roof component design useful life 12, roofing material and roof component sales price 13 output from the roofing material and roof component master 6, and the planned roof purchase date 14 input from the roofing material purchase system input screen 7 are input into the roofing material purchase system 4, and a purchase price 15 of the roofing material 2 and the roof component 3 is output by calculation processing by the computer system. In this embodiment, the roof material allocation drawing 18 can be referenced from the roof material purchasing system 4 as data related to roof construction, making it possible to efficiently remove the roof material 2 from the roof 1. As a result, it will be possible to provide economic benefits to the buyer, such as increasing the purchase price by 15% by reducing the hassle of removal. In addition, because there is a layout drawing 18 for the roofing material 2, it is possible to purchase the cut roofing material products 20 at the roof end 19, which makes it possible to increase the purchase price 15 of the roofing material per roof unit. As a result, the refurbishment rate of the roofing material 2 and the roofing component 3 can be increased, making it possible to create a system that is more suitable for a circular economy.

[0021] FIG. 6 is a roof plan of a roof 1 with roofing material 2 and roof components 3 according to an embodiment of the present invention. By using the roofing material purchase system 4, it is possible to calculate the purchase price 15 of the roofing material 2 and roof components 3 of a roof 1 as shown in Figure 6. The roof material layout drawing 18 shows a roof material cutting workpiece 20 at the roof edge 19 as shown in this drawing.

[0022] FIG. 7 is a roofing material layout diagram 18 according to an embodiment of the present invention. The roof 1 in this embodiment is a mixed hip-and-gable roof, and the shape of the roof 1 is made up of a corner ridge section, a land ridge section, a three-fork section, a ridge difference section, a valley section, and a eaves section. The roofing material layout drawing 18 illustrates how the roofing material 2 and the roofing material cut pieces 20 are laid out on the roof 1 . The roofing material cut product 20 is obtained by cutting the roofing material 2 to fit the shape of the roof edge 19. The roofing material layout drawing 18 illustrates the shape of the roofing material cut products 20 that are arranged on the roof edge 19, and by using the roofing material layout drawing 18, it is possible to determine whether the roofing material cut products 20 can be reused. As a result, the purchase price of roofing material 2 per roof can be increased by 15. By being able to purchase cut roofing material products 20 in addition to roofing materials 2 and roof components 3, it is possible to increase the refurbishment rate of roofs 1, making the system more suitable for a circular economy. [Industrial Applicability]

[0023] The roofing material used in the present invention can be adapted to various types of roofing materials. The roofing material in the embodiment is a sheet-shaped roofing material, but clay tiles, metal roofing materials, decorative slates, etc. can also be used. [Explanation of symbols]

[0024] 1. Roof 2. Roofing materials 3 Roofing materials 4. Roofing material purchasing system 5 Roof Database 6 Roofing Materials and Roofing Components Master 7 Roofing material purchase system input screen 8 Roof ID 9. Roofing materials and roofing component quantities 10 Construction date 11 Design service life of roofing materials 12 Design service life of roof components 13. Sales price of roofing materials and roofing components 14 Scheduled purchase date 15 Purchase price 16 Environmental Impact Degradation Factor Data 17 Roof appearance evaluation data 18 Roof material layout drawing 19 Roof Edge 20 Roofing material cut products

Claims

1. In a roofing material purchase system for roofing materials and roof components installed on roofs of buildings with slopes, The roofing material purchasing system includes a roof database, a roofing material / roofing component master, and a roofing material purchasing system input screen, The roof database stores a roof ID for identifying the roof, and data on the roof material, the roof component, the quantity of the roof material and the roof component, and the construction date for each roof. The roofing material / roofing component master registers the roofing material design useful life and the roofing component design useful life, and the sales price data of the roofing material and the roofing component, Enter the roof ID and the planned purchase date into the roofing material purchase system input screen, By performing calculations using the roofing material purchasing system, A roofing material buying system, characterized in that the buying prices of the roofing materials and the roof components are output.

2. 2. The roofing material buying system according to claim 1, wherein said roof database stores environmental impact degradation coefficient data for each roof depending on its location, and said environmental impact degradation coefficient data is added to said calculation processing.

3. 3. The roofing material buying system according to claim 1, wherein roof appearance evaluation data is added to said calculation processing by inputting roof appearance evaluation data into said roofing material buying system input screen.

4. 2. The roofing material buying system according to claim 1, wherein said roof database stores data on a roofing material allocation drawing in which said roofing materials are allocated to said roof.

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