https://www.repairmywindowsanddoors.co.uk/weston-super-mare-guttering-and-downpipes-near-me/ Repairing Leaks From Cast Iron Downpipe Joints Leaks in the cast iron joints of downpipes can be a problem. They can lead to water damage and promote the growth of mildew and mould. Fortunately the pipes are repairable. But first you'll need to clean the pipes free of any rust or paint with wire brushes. After the pipes have been cleaned, you'll need to determine the extent and nature of damage. Caulking Although caulking isn't a long-lasting solution, it's usually enough to protect against further damage and keep rainwater flowing. Most hardware and home improvement stores carry mortar caulking. It's used for sealing gas in bricks, stone and metal, for repairing cracks in foundations and basements, preventing leaks around windows and doors, and it can also be used to seal cast iron pipe joints. When you use caulking, be sure to get rid of any paint or rust from the area prior to applying the new sealant. If needed, you can use a wire brush or scraper to get rid of the paint or rust. Be careful not to cut or scratch the pipe. Wear gloves when working with caulking since the chemical compound can cause irritation to the skin. To prepare the area for caulk application, make use of a wire scraper or wire brush to clean any rust or debris from the pipe joint. Masking tape should be positioned on either side of the space to allow clean lines to be applied when caulking. The end of the caulk tube should be cut at 45-degree angles. Then, fill the caulk gun up with a small amount the compound. Apply it to the joints and gaps you'd like to repair. When using a caulking gun you should be consistent with the speed and pressure you use to apply a smooth, even bead of the compound to the gaps or joints. After you've applied the caulking, take at least six hours before using the downpipe once more. This will allow the caulking to completely dry and provide an extremely durable, long-lasti