Code 4 & Code 5 lead flashing replacement. Mechanically fixed, properly pointed. written workmanship guarantee.
Call 07476 888638 for a free, no-obligation quote. Available Mon–Sun, 9am–6pm.
Failed lead flashing is the single most common cause of recurring roof leaks in West Glamorgan — chimney aprons that have lifted, soakers that have torn, abutment flashings that have pulled out of the mortar joint. Johnson's Roofing replaces lead flashing to LSA Code 4 and Code 5 standards, properly chased and pointed into the brickwork with lead-clipped mechanical fixings. Done once, done right.
We strip the failed flashing back, rake out the brick joint to a minimum 25 mm depth, dress new Code 4 or Code 5 lead to the contour of the abutment, secure it with lead clips into the chase, and finally point the chase with sand-cement plus a flexible additive. Patination oil is applied on completion to prevent the white carbonate staining that disfigures fresh lead-work.
Three main reasons: thermal movement opens the mortar pointing along the chase, lead is cut too short or in over-long bays so it cracks, or no mechanical fixings were used so wind eventually lifts it. We address all three on every job.
Code 4 (1.80 mm thick) is the standard for chimney aprons, soakers and most domestic step-flashing. Code 5 (2.24 mm thick) is heavier-duty and used for back-gutters, valleys and longer runs. We specify the correct code for each location.
Almost never — by the time lead has failed it's usually work-hardened, split or torn. We strip it, weigh it and credit the recycle value against your invoice. Fresh milled lead is always our recommendation for a lasting repair.
Properly installed Code 4/5 lead-work to standard detailing has a service life of 60+ years. Our workmanship guarantee is provided in writing.