Two methods for improving sagging joists

Structure · Joists · printed page 52 (PDF page 53)

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Book index entries

Sagging Correction Sagging – Joists – Correction Furnace – Joists Joists

Text in the illustration

A
add a sister onto sagging joist with lumber of same size
sister
sagging floor joist
sill
foundation wall
B
add beam at midpoint to cut joist span in half
beam

Generated explanation

The illustration shows two methods for improving a sagging wood floor joist spanning between sills on foundation walls. Method A adds a same-size lumber sister alongside the existing joist, with fasteners shown along its length. Method B adds an intermediate beam beneath the joist at its midpoint to cut the unsupported span in half. The intermediate support is depicted as an I-section beam supported by a round column.