https://www.repairmywindowsanddoors.co.uk/fulham-guttering-and-downpipes-near-me/ Repairing Leaks From Cast Iron Downpipe Joints Leaks at the cast-iron joints of downpipes can be a source of concern. They can cause water damage and encourage mold and mildew growth. Fortunately they can be repaired. First, you'll need to clean the pipes of any rust or paint using a wire brush. After the pipes have been cleaned, it is time to determine the extent and nature of damage. Caulking Although caulking isn't a long-lasting fix, it's often enough to prevent further damage and keep the rainwater flowing. You can find mortar caulking at most hardware and home improvement stores. It's used for sealing gas in stone, bricks and metal, for repairing cracks in foundations and basements, preventing leaks around windows and doors and can be used to seal cast iron pipe joints. If you are using caulking, make sure to get rid of any paint or rust from the area before applying the new sealant. If necessary, you can employ wire brushes or scrapers to remove the paint or rust. Be careful not to cut or scratch the pipe. It is also recommended to wear gloves while working with caulking because the chemical compound can cause irritation to your skin. First prepare the area for application of caulking by cleaning it using a scraper or wire brush to get rid of any rust or debris that's stuck to the pipe joint. Masking tape should be positioned on either side of the area for clean lines to be applied when caulking. The end of the tube of caulk should be cut at 45-degree angles. Then fill the caulk gun with a small amount the compound. Apply it to the joints and gaps you'd like to repair. It is recommended to use a caulking tool with consistent speed and pressure in order to apply an even, smooth bead. At minimum six hours after applying the caulking prior to using the downpipe. This will allow the caulking to completely dry and form a an impervious seal. Although most people can perform some work