Instructions about connecting the gutter’s corners
Installing a copper gutter cannot be compared to installing an aluminum gutter. Carrying a material as heavy as copper isn’t a job you can do by yourself, you should have another person to help you. Maybe you want to use another material, like aluminum, which is not only lighter, but also easy to install.
First, make a 45 degree cut at the corner of the aluminum material. It doesn’t matter if you choose the outside or inside angle of the corner. What matters is that in the end, the parts fit together properly.
You can use miter slip joints to secure the corners of the gutter. After that, use silicone, or waterproof heavy-duty adhesive to seal the joints. The substances used to seal the joints are very harmful for your skin, so avoid getting in contact with them. Instead use a knife to apply them on the joints. After finishing applying the sealing substances, press the ends of the joints firmly until the silicone or adhesive is completely bonded.