A Roofer’s Guide to Sustainability

1. Sustainable Roofing Solutions A Roofer’s Guide to Sustainability YIRTG is pleased to acknowledge that the Roofers Guide to Sustainability Modular Programme was developed with funding from CITB ConstructionSkills as part of their long term commitment to training and quality standards in the specialist roofing sector. This support is gratefully appreciated

2. The Plan • Sign Attendance Register • Complete Activity • Aims • Presentation • Activity • Review

3. CourseAims • To provide an overview of solar products • To explain the types of Green roofs and their benefit to the environment

4. Solar

5. Activity How many types of Solar Products can you name?

6. Photovoltaic • The term "photovoltaic" comes from the Greek meaning "light", and from "Volt

7. How a crystalline PV cell is produced Silica sand. Silica is heated in a furnace with carbon to produce silicon. The silicon is then further treated to 99.99% purity. The purified silicon is then made into ingots. The ingots are sliced into wafers 200 – 300 microns thick.

8. How a crystalline PV cell is produced The sliced wafers are doped to create a positive and a negative sided cell. The cell is then cut as square as possible and thin metallic contacts printed on both sides. Several cells are connected together and laminated between glass and a rear substrate to create a solar panel.

9. Types of crystalline PV cells There are two types of wafer photovoltaic cells: Monocrystalline: Single cylindrical crystal ingot, drawn from a bath of liquid silicon. The ingot is trimmed to produce a nearly square cross section, prior to being cut into wafers. In good light conditions, monocrystalline is the most efficient of all current PV technologies.

10. Types of crystalline PV cells Polycrystalline: Offcuts and breakages are recovered from other parts of the production process. These are recycled by melting, and cooling them into a block. This is then cut into wafers, and since it is rectangular in section, there is no futher wastage. Polycrystalline cells are typically less efficient than monocrystalline ones. Due to polycrystalline cells being truly square though, they can be cut without any wasted material. This means that modules produced from both cell types tend to have similar power yields.

11. Amorphous Thin Film • Thin Film is produced when amorphous silicon is deposited on a backing substrate • Tis reduces the amount of silicon required to make the cells and reduces the cost of thin film technology compared to alternatives • Thin film is a good alternative where weight restrictions limit the use of other technologies or as a cheaper alternative for a larger area.

12. On-Roof Photovoltaic

13. In-Roof Photovoltaic

14. Photovoltaic Tiles

15. Solar Thermal

16. Low Ballasted Systems

17. Thin Film Welded Systems

18. Transpired Solar Collectors

19. Solarwall

20. Rainscreen / Overcladding

21. Green

22. Benefits of Green Roofs • Reduced rainwater run-off • Extended life of roof covering • Habitat conservation • Building insulation and • Reduced sound transfe

23. Intensive Green Roofs

24. Extensive Green Roofs

25. Brown Roofs

26. Activity Knowledge Test – Check your knowledge

27. The Yorkshire Independent Roof Training Group is pleased to acknowledge that the Roofers Guide to Sustainability is delivered as a result of funding provided by CITB ConstructionSkills as part of their long term commitment to training and quality standards in the specialist roofing sector.This support is gratefully appreciated