What is trimmer in construction?

A trimmer is a type of wooden support used in construction to support the edges of a floor opening, such as a stairwell or hatchway. They are typically positioned around the perimeter of the opening and secured directly to the structural framing of the building. Trimmers provide a solid support for the weight and pressure of the floor joists, subfloor, and any other loading that may occur. They can also be used to attach stair treads or finish floor materials and help prevent movement or sagging in the floor structure. Trimmers can be made of various types of wood, but are typically made of stronger species such as oak, maple or pine. They should be chosen for their strength, stability, and ability to withstand heavy loads and resist warping or twisting over time. Trimmers can be installed by experienced carpenters or building contractors and should be handled and cut with care to ensure proper fit and support.