https://www.repairmywindowsanddoors.co.uk/kettering-guttering-and-downpipes-near-me/ Repairing Leaks From Cast Iron Downpipe Joints Leaks from downpipe joints made of cast iron can be a serious issue. They can lead to water damage and promote the growth of mould and mildew. Fortunately they can be fixed. But first you'll need to cleanse the pipes free of any rust or paint using a wire brush. After the pipes have been cleaned, you'll need to assess the extent of the damage. Caulking It's not permanent It can, however, be used to stop further destruction and help keep rainwater flowing. The majority of hardware and home improvement stores carry mortar caulking. It is used to seal gas pockets in bricks stone, metals, and bricks, repair fissures and foundations and stop leaks around doors and windows. Before applying caulk remove any paint or rust that has escaped. You can use a wire brush or scraper to do this however, be careful not to scratch or cut the pipe. Also, you should wear gloves when working with caulking, as the chemical compound can cause irritation to your skin. To prepare the area, use a wire scraper or wire brush to remove any rust or debris from the pipe joint. Masking tape is placed on either side of the area to ensure that there are no lines left when you apply the caulk, and the edge of the caulk tube should be cut at a 45-degree angle. Then, fill the caulk gun with a small amount of the compound. Apply it to the gaps and joints you wish to repair. You should employ a caulking tool that has a consistent speed and pressure to apply a smooth, even bead. At least six hours after applying the caulking prior to using the downpipe. This will allow the caulking to completely dry and provide the strongest, longest-lasting seal. While many people can do some work themselves to maintain their gutters and downpipes, it's best to leave the most extensive repairs to experts who can provide the most efficient results. This is especially true if damaged areas are