Excessive sagging around poorly framed stair openings

Structure · Concrete Floor Slabs · printed page 58 (PDF page 59)

Book index entries

Floor – Excessive Sagging Around Poorly Framed Stair Openings Stair – Excessive Sagging Around Poorly Framed Stair Openings

Text in the illustration

Excessive sagging around poorly framed stair openings Stair Opening The framing at the side of the stair opening supports the joists at the side of the stairs if this framing is not strong enough, then it (and the joists) will sag look for doubled or tripled joists, joists with a greater depth, and/or a wall at the side of the stairs to support the floor above
Stair Opening
The framing at the side of the stair opening supports the joists at the side of the stairs
if this framing is not strong enough, then it (and the joists) will sag
look for doubled or tripled joists, joists with a greater depth, and/or a wall at the side of the stairs to support the floor above

Generated explanation

A cutaway perspective shows wood floor joists and framing bordering a stair opening, with part of the floor surface removed to expose the structure. Joists beside the opening bear into the bordering framing, which must carry their loads. Reference lines and a vertical double-headed arrow illustrate sagging below the intended floor plane. The annotations identify inadequate framing strength as the cause and advise looking for doubled or tripled joists, deeper joists, or a supporting wall beside the stairs.