Question 1

What is Code 3 lead flashing?

Accepted Answer

Code 3 lead flashing is lead sheeting with a nominal thickness of around 1.32 mm and a weight of about 15 kg/m². It’s commonly used on roofing jobs for applications such as soakers, step flashings, and lean-to flashings due to its flexibility and ease of shaping.

‘Code 3’ is a standard classification that indicates both the weight and the resulting thickness of the lead sheet. It also indicates that the sheet is manufactured to meet the British and European standards.

Originally, the number “3” signified that the lead sheet weighed 3 pounds per square foot, although nowadays it’s just an indicators of its nominal thickness.

Question 2

How thick is Code 3 lead flashing?

Accepted Answer

The nominal thickness of Code 3 lead flashing is approximately 1.32 mm. There will be some variation in manufacturing, meaning the actual sheet may be up to 5 % thinner or thicker than stated. This tolerance accounts for minor inconsistencies that occur during production, but the material must remain within this range to comply with standards. In practice, this means the thickness might range from roughly 1.25 mm to 1.39 mm, depending on batch and roll.

Question 3

What’s the difference between Code 3 and Code 4 lead flashing?

Accepted Answer

Code 3 and Code 4 lead flashings mainly differ in thickness and how robust they are. Code 3 lead is thinner, making it more flexible and suitable for detailed work. On the other hand, Code 4 lead is thicker (approximately 1.80 mm), which makes it more durable and better suited for exposed uses. In addition, the increased thickness of Code 4 (as well as Code 5) lead gives it greater resistance to tearing, mechanical stress, and thermal movement.

Code 3 lead flashing

Code 3 Lead Flashing 300mm x 6m

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Code 3 Lead Flashing 600mm x 6m

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Code 3 Lead Flashing 760mm x 3m

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Code 3 Lead Flashing 225mm x 6m

Code 3 Lead Flashing 360mm x 6m

Code 3 Lead Flashing 600mm x 3m

Code 3 Lead Flashing 760mm x 6m

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Code 3 Lead Flashing 1000mm x 6m

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Code 3 Lead Flashing 1200mm x 6m