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GSA PRESENTATION
- 1. A durable integrated system for PV installations on existing and new roofs
- 3. Look at the roof and PV system together as a single asset. Then assess the total cost of ownership over the total life of the asset
- 4. Basics of Metal Roofing
- 7. 1200-1450
- 9. Metal Offers Design Flexibility
- 13. Metal Provides Long Service Life
- 18. 35-year-old Galvalume ® steel roof New Orleans, LA
- 19. 28-year-old roof Ergoldsbach, Germany This roof, which is about to be retrofitted with a PV array, is estimated to have a remaining service life of 30 years or more.
- 25. No holes! PV Attachment to Metal Roof
- 28. Thin-film PV is flexible, durable, and fits into standing seam roofs
- 29. Thin-film applications are aesthetically pleasing, casting no shadows or causing any glare.
- 30. Crystalline Si PV Panels
- 32. Popular for vast expanses of commercial, industrial, office, and retail rooftops (±700,000,000 sf annually)
- 35. What is the service life of PV? The warranted life = 25 years… but the service life ≈ 30 years.
- 36. Penetration of Conventional Roof System
- 39. More than 10,000 points of attachment
- 46. AGED BRONZE COLORED ROOF: T Sun = 174º F T Shade = 118º F ΔT Sun to Shade = 56º F (ambient = 81º F)
- 47. A convective air plenum ensures even cooler temperatures.
- 50. So when roof life expires… dismantle the PV array… tear the roof off…
- 51. throw it away… reroof, and then… reassemble the PV array.
- 57. Method: Direct Mount—seam clamp and interface Mounting system cost: $0.087/watt
- 58. Look at the roof and PV system together as a single asset. Then assess the total cost of ownership over the total life of the asset
- 59. Retrofit Solutions for Existing Buildings
- 60. Solutions for any reason or purpose
- 61. Solutions for any reason or purpose
- 63. Before After
- 69. Problematic Roofs During Near Complete During After
- 71. Insulated Applications Existing roof and purlins New metal roof New subpurlins New insulation
- 73. Natural Convective Ventilation (ASV) Less 30%–45% heat gain Hot air out Ambient air in Radiant heat Less heat loss Building heat New metal roof Existing roof Air heats up and moves upward by convection
- 75. Solar Thermal Heat Recovery Ambient air in Heated air distributed to HVAC system with solar powered fan Air heats up and moves upward by convection New metal roof Existing roof Winter –closed ridge
- 76. Solar Thermal Water Heating New metal roof Optional insulation Vented eave Circulated fluid in flexible tubing heats up Reflective radiant barrier and insulation
- 77. Retrofit Makes $ense Energy Saving Solutions
Editor's Notes
- What’s Important: Retrofit roofs provide exceptional environmental and energy efficiency benefits from: Reducing heat gain through the roof assembly in warmer months Reducing heat loss through the roof assembly in colder months Retrofit walls provide a means to beautifying an existing building with more up-to-date and energy efficient wall cladding that is architecturally pleasing
- What’s Important: The left-hand column explains what the major benefits that retrofit presents to the design professional and building owner The right-hand column does the same but highlights some of the positive environmental impact that this concept presents as well as what else can be done during the design/construction of a retrofit to improve its benefit
- What’s Important: The left-hand column explains what the major benefits that retrofit presents to the design professional and building owner The right-hand column does the same but highlights some of the positive environmental impact that this concept presents as well as what else can be done during the design/construction of a retrofit to improve its benefit
- This slide introduces the next four slides that address and explain various solar power systems using photovoltaic (PV) technology
- This slide introduces the next four slides that address and explain various solar power systems using photovoltaic (PV) technology
- This slide brings attention to the “Pitfalls” of installing rack-mounted PV systems over existing flat or sloped roofs that have conventional roofing systems. The principle issue is the PV service life is more than the expected life of the various conventional roof membranes. Therefore, when the roof has to replaced, so does the PV system and then it has to be re-installed.
- This slide self-explanatory whereas with metal roofed buildings, PV mounted systems do not required penetrations through the metal for attachment.
- This slide summarizes the benefits of PV over standing seam metal roofs, whether for retrofit applications or new construction
- Problems with conventional roof types, Next slide
- What’s Important: This slide introduces the two basic applications of retrofit roofing and essentially what they represent to a design professional and building owner: Metal over existing flat roofs Metal over existing sloped roofs
- This slide illustrates pictorially Before and During construction of metal retrofit over existing flat roofs. The bottom two slides illustrates the advantage of using retrofit metal systems in new construction. This project was site-built structural concrete construction for a hotel in southern Georgia. The retrofit framing system was used in lieu of light-gauge pre-engineered trusses due to its competitiveness with other framing methods. The framing for these type of retrofit systems is essentially fabricated in the field. They come to the jobsite in standard cut-lengths (20’ +/-) and measured, cut and erected right on the existing roof top or concrete deck in this application.
- What’s Important: This slide introduces the two basic applications of retrofit roofing and essentially what they represent to a design professional and building owner: Metal over existing flat roofs Metal over existing sloped roofs
- This slide illustrates the metal over existing conventional roofed system
- What’s Important: This slide introduces the two basic applications of retrofit roofing and essentially what they represent to a design professional and building owner: Metal over existing flat roofs Metal over existing sloped roofs
- This slide illustrates pictorially Before and During/After construction of metal retrofit over problem roofs.
- What’s Important: This slide essentially addresses good roof design practices where the designer should include current energy standards in the overall roof assembly. It is an intro-slide for the following eleven slides.
- What’s Important: This slide essentially addresses good roof design practices where the designer should include current energy standards in the overall roof assembly. It is an intro-slide for the following eleven slides.
- What’s Important: This slide essentially addresses good roof design practices where the designer should include current energy standards in the overall roof assembly. It is an intro-slide for the following eleven slides.