A perpendicular lined indentation that can appear throughout the entire length of a lead roll at spacing equal to that of the circumference of the roll - the distance between the lined indents decreasing the closer you get to the roll centre.

Contractor frustration

Despite the feedback from Contractors, this matter has mostly been ignored by the industry and their supporting associations.

Some manufacturers do claim to run special Barmark free mills – in essence, admitting to the problem. Yet even these are reportedly* no better quality than product that is produced on regular mills.

*Feedback received by us from highly respected industry artisans.

Will a Barmark affect the performance of the Lead sheet?

It is unlikely that a Barmark will affect the performance of the lead sheet. However, aesthetically (in particular, when laid in bays) the Barmark can be an unsightly and unwanted addition to the overall aesthetic of your finished lead roof. Some Barmarks being so prominent that they are easily viewable from ground level.

How can you remove a Barmark?

"With difficulty", is the only real answer! Traditionally, on lighter codes, the Barmark would have been ‘flapped’ out (using one sheet strip of lead and physically flapping it repeatedly on the Barmark until it disappeared). On the heavier codes, the only option being to heat the lead and dress it out. Both of these solutions are painstakingly slow and are completely unacceptable today.