This ceiling is maintenance free and have good thermal properties. The finish is smooth and is only available in white. It is also good for exterior use such as garage doors and gates.
Depending on the type of roof, the norm is one downpipe per every 3m of guttering - this will ensure sufficient drainage of the gutter to prevent it from overflowing.
The main purpose of an angle is to enable the installer to do an installation where it is required that the gutter must continue around a corner of the roof.