Which component connects the trimmers to the joists?

The component that connects the trimmers to the joists is known as a header. Headers are horizontal structural elements that provide support and stability, particularly at openings. When installing floors or ceilings, trimmers (which are shorter framing members used around openings) are typically supported by headers, allowing the load from the joists to be distributed properly.

In contrast, a beam generally refers to a larger structural element that spans a distance to support loads, while a girder is a main horizontal support beam that carries the load of smaller beams or joists. Posts are vertical supports that transfer loads from beams or girders down to foundations or footings. Understanding how these components interact is essential for proper framing and load distribution in residential construction.