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What is code 4 lead flashing used for?


Code 4 lead flashing is used for a range of roofing applications including soakers, flashings, and vertical cladding. It’s 1.80mm thick and weights 20.41 kg/m2 so it’s a malleable and workable product. It’s available to purchase in 6m rolls and 3m rolls as well as cut to the exact dimensions you require. Looking for different lead code advice? Use our table to work out which lead code you need for your project.

Code 4 lead flashing soakers

Code 4 lead flashing is often the first choice for soakers as it’s the maximum allowed thickness that soakers can be. Failure to adhere to this, and using a thicker lead code, can mean that tiles or slates don’t lay properly due to the materials beneath them. All soakers must be supported properly to serve their function.

Code 4 lead flashing

As previously mentioned Code 4 lead can be used for many roofing applications, with the 1.80mm thick Code 4 lead being the minimum required thickness for all flashings. Including window flashings, apron and cover flashings, chimney flashings, step flashings and more, the list of what Code 4 lead is used for goes on to cover vertical cladding as well.

For more advice or guidance on code 4 lead flashing please contact our roofing helpline on 01752 692 760 or use Calder’s Guide to Good Leadwork for more information.


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