Flashings on your flat roof should last as long as any part of the structure, but harsh weather or age can mean that flashing pulls away from the joints or brickwork that it is protecting. In many cases the flashing can be repaired by simply drying the area, pushing it back into place and adding adhesive, staples or nails to keep it in place. Your roofer may also use tar or another sealant to keep the join watertight.
In some cases the flashing, or part of it, will need to be replaced. If this is the case then your roofer will cut as long a strip of flashing as is needed and lay this at the spot where he has removed old flashing. He may seal the flashing here by soldering as well as by using adhesive and/or tar. The cost of the job will depend upon how much flashing needs replacing and where it is located. Hard to reach spots will take longer to repair and will thus cost more in terms of labour. Most flashing is made from lead or copper and the current cost of these metals will impact upon the cost of any replacement or repair.
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