Lead has been in use in roofing for hundreds of years and due to its workability, it is versatile and can be very durable when used in the right quality and thickness, however the health hazards were not recognised until late in the 19th century.

Lead sheet and flashing has been awarded BRE Green Guide ratings of A and A+ when manufactured to British Standard BS EN12588, but this is based on its ease of long-life expectation, recyclability and due to a low melting point and high value, an equally high recycling rate. The high value also makes it a target for thieves.

In roofing applications, rainwater run-off is contaminated by the lead and therefore is unsuitable for many rainwater harvesting & recovery systems.

Patination oil can be used to delay the effect of oxidation that creates the white appearance and unsightly staining that affects roof tiles, slates and brickwork, but is also toxic and flammable.

It should be remembered that lead is toxic and banned in some countries. When using lead, operatives need protection from inhalation of lead dust and fumes, and absorption through the skin. Control of Lead at Work Regulations 2002 Approved Code of Practice and guidance (HSE L132) provides much more information and requires that where an alternative is available, it should be used.