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

Sustainable Roofing Solutions

The Plan

• Sign Attendance Register• Complete Activity• Aims• Presentation• Activity• Review

Course Aims

• To provide an overview of solar products• To explain the types of Green roofs and their

benefit to the environment

Solar

Activity

How many types of Solar Products can you name?

Photovoltaic

• The term "photovoltaic"

comes from the Greek meaning "light",

and from "Volt

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.

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.

How a crystalline PV cell is produced

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, monocrystallineis the most efficient of all current PV technologies.

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.

Types of crystalline PV cells

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.

On-Roof Photovoltaic

In-Roof Photovoltaic

Photovoltaic Tiles

Solar Thermal

Low Ballasted Systems

Thin Film Welded Systems

Transpired Solar Collectors

Solarwall

Rainscreen / Overcladding

Green

Benefits of Green Roofs

• Reduced rainwater run-off

• Extended life of roof covering

• Habitat conservation• Building insulation and• Reduced sound transfe

Intensive Green Roofs

Extensive Green Roofs

Brown Roofs

Activity

Knowledge Test – Check your knowledge

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