Floor bump caused by excessive joist overlap

Structure · Joists · printed page 53 (PDF page 54)

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Excessive Joist Overlap Causes Floor Bump Overlap – Excessive Furnace – Joists Joists

Text in the illustration

cross sectional view
pronounced bump
dotted lines show resultant floor unevenness
joist ends too long causing end to raise up when joist deflects
beam
basement
joists should not overlap beam by more than 2"
Joists
perspective view

Generated explanation

The illustration combines a house cross section with a perspective detail of floor joists overlapping above a basement support beam. The joist ends extend excessively beyond the beam, and arrows show how downward joist deflection lifts the projecting ends. In the cross section, dotted lines indicate resultant floor unevenness, including a pronounced bump over the beam. An annotation states that joists should not overlap the beam by more than 2 inches.