Is bounce a safety issue?

Modest bounce is usually a serviceability issue (cracked tile, walking discomfort) rather than an immediate safety concern. Severe deflection, visible sagging, or bounce that has recently gotten worse can indicate a real structural problem that a PE should evaluate.

Will jacking up the floor level fix the bounce?

Not usually. Bounce is a stiffness problem: the joists don't have enough depth or continuity. Jacking addresses slope, not stiffness. The fix is sistering, adding a girder, or both.

How long does bouncy-floor repair take?

Most engineered repairs (sistering, adding a girder line) take a Triangle crew 1-3 days once the PE-stamped plan is issued. Rotted subfloor replacement adds time depending on the affected area.

Why are my floors bouncy in my older Durham home?

Bouncy or spongy floors in older Durham homes almost always mean the floor joists deflect more than modern code allows under normal loads. Common causes: overspanned original joists (2x8s where today's code would call for 2x10s), notches or holes drilled through joists for plumbing and HVAC, rotted subfloor from long-standing moisture, or a missing intermediate girder line. A PE crawl-space visit identifies the exact cause and specifies the engineered fix.

Why so many Trinity Park and Watts-Hillandale homes bounce

Homes built before the 1980s were framed to older span tables with lighter live-load assumptions. Kitchens have since been renovated, joists notched for new plumbing, and heavy appliances added, all on the original framing. The result is measurable deflection under everyday loads.

Older Durham crawl spaces also often show settled piers and rotted rim joists that add to the bounce.

Engineered fixes

Common fixes are joist sistering with dimensional lumber or LVLs, adding a new intermediate girder with piers on new footings, and replacing sections of rotted subfloor. Each is a stamped-plan project because it changes the load path and needs to be sized correctly for the span and loading.

Frequently Asked Questions

Is bounce a safety issue?: Modest bounce is usually a serviceability issue (cracked tile, walking discomfort) rather than an immediate safety concern. Severe deflection, visible sagging, or bounce that has recently gotten worse can indicate a real structural problem that a PE should evaluate.
Will jacking up the floor level fix the bounce?: Not usually. Bounce is a stiffness problem: the joists don't have enough depth or continuity. Jacking addresses slope, not stiffness. The fix is sistering, adding a girder, or both.
How long does bouncy-floor repair take?: Most engineered repairs (sistering, adding a girder line) take a Triangle crew 1-3 days once the PE-stamped plan is issued. Rotted subfloor replacement adds time depending on the affected area.