What additional pieces of lumber should an estimator include for a stairwell opening?

When estimating for a stairwell opening, the inclusion of trimmers and headers is essential. Trimmers are the pieces of lumber that support the stairwell opening by framing around the edges. They help to distribute the load from the structure above the opening, ensuring that the integrity of the surrounding area is maintained. Headers are horizontal members placed at the top of the stairwell opening, which also help to support weight and provide a stable framework.

By incorporating trimmers and headers into the estimate, the estimator addresses the specific structural requirements of a stairwell, thereby ensuring that the opening is properly framed and supported. This attention to framing details is critical for safety and compliance with building codes.