Vertical shoring members that may be solid (SHEETING) or spaced from 2 to 8 feet apart to prevent cave-ins. Found in: O&M of Wastewater Collection Systems, Vol I & II
the vertical members of a trench shoring system placed in contact with the earth and usually positioned so that individual members do not contact each other. Uprights placed so that individual members are closely spaced, in contact with or interconnected to each other, are often called "sheeting."
Upright machines are easy to push, manoeuvre, are more convenient and are better for your back. They make cleaning large areas quicker and have a revolving brush bar, which is great for removing trodden dirt, grit and pet hair from carpets.