Guttering consists of the plastic or metal channels fixed to the lower edge of the roof of a building, which rain water drains into. (Collins Dictionary)
The act of making gutters. (Dictionary.com)
The system of open pipes on a building that collects and carries away rain. (Cambridge Dictionary)
The gutters of a building. (Oxford Dictionaries)
Material used to make gutters. (Oxford Dictionaries)
190 mm Rain line half round gutter.
Galvanised steel gutter.