How To Do Lead Flashing On A Pitched Roof

Cut lead sheets to the regulation required length of 1 5mtr on the ground.

How to do lead flashing on a pitched roof.

This is made by rolling up a 25mm or less strip of lead into an oval shape just wider than the mortar chase you are fixing then driving it below the surface of bricks to form a wedge. It s much easier to reseal the flashing than it is to patch a water stained wall or ceiling. How to fix lead roof flashing the most common method of fixing lead flashing is to make a lead bung or chock. This is made by rolling up a 25mm or less strip of lead into an oval shape just wider than the mortar chase you are fixing and then driving it below the surface of the bricks to form a wedge.

Now cut a piece of milled lead to around 1 2m long with the measured distance as the width of the lead. That lip is then set into a reglet or groove in this case cut into the mortar joint of the brick wall above. Having taken the measurements on the roof of the required folds in the lead to fit the job being done using a length of timber mark out the lead along the width of the roll to fold it. Cut the lead into 1500mm lengths.

The most common method of fixing lead flashings is to make a lead bung also known as a lead chock. Dress the lead to the required angle with a lead beater. Any longer than 1 2 metres long and the lead will be harder to shape and more likely to split over time. Recaulk the joints between the roof and the flashing.

Do this for all 1 5mtr lengths. First shape the 20mm chase by tapping the lead over the plank and forming a lip. You will then need to form the lead into shape on the ground using timber planks and a lead dresser. Then carefully bend the lead to form the pitch of the roof again using the plank.

Shape the lead flashing. Renew flashing seals by chipping out old caulking and mortar along the edges of the flashing. To fit the lead flashing onto the roof lead dressing tools can be used.