Your Floors Are
Bouncy.
That’s Structural.
A floor that bounces, springs, or moves when you walk on it is measuring deflection in the framing below — not normal settling. The bounce doesn’t go away. A forensic inspection finds the cause. A fixed-price repair eliminates it.
What Bouncy or Springy Floors Actually Means
A bouncy or springy floor is measuring deflection in the framing below — joists that are overspanned, undersized, cracked, notched, or that have lost section to decay. It is not normal settling and it does not resolve on its own. Realty Repair Co. (APCON LLC, Washington General Contractor #APCONL*825QO) diagnoses and repairs this condition directly as the general contractor in Tacoma and Pierce County, Washington.
- Common causes
- overspanned or undersized joists, joists notched or drilled for plumbing, missing mid-span blocking or bridging, a failed girder or post, or decayed joist ends at the sill.
- Is it urgent
- It does not self-correct. The underlying moisture or load problem continues, and repair scope grows with time.
- How it is diagnosed
- $350 forensic structural report — on-site moisture meter readings, physical probing to map the failure boundary, photographs, identified cause, and a fixed-price repair proposal. Credited 100% against the repair contract if you proceed.
- Pricing method
- Lump-sum fixed price issued after the failure boundary is confirmed. No hourly billing.
- Guarantee
- Five-year written guarantee on structural repairs.
- Licensing
- WA General Contractor #APCONL*825QO, bonded and insured. Work performed under the 2021 Washington State Residential Code (WAC 51-51, effective March 15, 2024).
- Contact
- 253-891-9622 · dispatch@realtyrepairco.com · 711 115th St S, Tacoma, WA 98444
Reviewed by Dindar Nasim, owner and Washington licensed general contractor (#APCONL*825QO) · Updated September 28, 2026
You are not buying an estimate. You are buying a written structural report you own — every joist in the affected span probed, deflection cause identified, photographs, and a lump-sum fixed price. A contractor who quotes bounce from the top of the floor is guessing at what is under it.
Schedule Your Diagnostic →Credited 100% against your repair contract. If the findings show no structural repair is needed, you keep the report and there is nothing to buy.
Why Floors Bounce — And Why It Matters
Floor deflection is not a quirk of older homes. It is a measurable structural condition — your joist system failing to hold its shape under load. Every bounce you feel is the framing moving. That movement has a cause, and the cause does not resolve on its own.
Undersized or Over-Spanned Joists
Joists that were undersized for their span at original construction — or had their bearing length reduced by notching, boring, or alterations — deflect more than design allows. The floor bounces because the joist is flexing beyond its structural limit under normal load.
Moisture Damage & Dry Rot
A joist weakened by fungal decay loses stiffness progressively. The floor may have been solid for years before suddenly developing bounce in a localized zone. Dry rot in a crawl-space joist is the most common cause of concentrated bounciness in PNW homes — especially near plumbing fixtures.
Missing or Failed Mid-Span Support
A girder beam or support post that has settled, shifted, or rotted at the base removes mid-span support from the joists above it. Every joist in that bay loses its intermediate bearing point and begins to deflect. The bounce is distributed across a wider zone of the floor.
Subfloor Delamination
Moisture-damaged plywood subfloor delaminates — the layers separate and the panel loses structural rigidity. This creates a soft, compliant surface that moves under foot. The joists below may be intact, but the subfloor itself has become the failure point. Replacement is the only fix.
How to Read What
Your Floor Is Telling You
Not all bouncy floors are the same failure. The pattern — where it bounces, how much, and what else is happening nearby — points toward the specific cause. These are the combinations that warrant a forensic inspection.
The Bounce Gets Worse — Not Better
Load cycles don’t give a compromised joist time to recover. Every step, every furniture load, every seasonal movement adds to cumulative deflection. A floor that bounces slightly today will bounce more in six months if the underlying cause — moisture, decay, missing support — is still active. The repair scope that costs X today grows when adjacent members become involved. Timing is the only variable still in your control.
How Bouncy Floors
Are Actually Fixed
There is no universal fix for floor deflection. The repair depends on what caused it. That’s why the forensic diagnostic comes first — the repair scope is written after the cause is confirmed, not before.
Joist Sistering
A full-length sister joist is fastened alongside the deflecting or damaged member, transferring the structural load to new lumber. Access is made from the crawl space — the finished floor above is typically undisturbed. The most common repair for deflection caused by overspan or minor moisture damage.
Mid-Span Support Installation
When bounce is caused by a missing or failed support post or beam, a new mid-span bearing point is installed. This may involve a new steel post on a reinforced footing, an adjustable jack post, or a sistered girder beam — depending on what the forensic inspection reveals.
Full Joist Replacement
When a joist is fully compromised by dry rot — hollow or fractured — it must be removed and replaced rather than sistered. The moisture source is identified and corrected simultaneously. New lumber is installed to current span rating standards.
Subfloor Replacement
When delaminated or rot-damaged subfloor is the cause of the bounce — rather than the joists below — the compromised panel is removed after joist repair and replaced with new structural sheathing. Floor finish above is reinstated to match existing.
From Diagnostic to Done
Four steps. Fixed price. One guarantee.
Book the Diagnostic
One call or one message. $350 confirmed at booking — no hidden fees, no bait-and-switch scope.
Forensic Crawl Space Inspection
We enter the crawl space, probe every joist in the affected span, and identify the exact cause of deflection with photos.
Fixed-Price Scope Delivered
Written report and lump-sum repair proposal typically delivered within three days. Your $350 diagnostic fee credits in full toward this price.
Repair — Warranted
APCON LLC performs structural framing directly under WA GC License #APCONL*825QO. 5-year written guarantee on all structural repairs.
Bouncy Floors —
What Homeowners Ask
Related Structural Services in Tacoma
Bouncy Floors —
Symptom to Repair Scope
The same bouncy-floor symptom can have very different causes. Each row below shows a sub-symptom, the most likely underlying cause, and the repair scope that usually follows. The $350 diagnostic confirms exactly which row applies to your house.
| Sub-Symptom | Likely Cause | Typical Repair Scope |
|---|---|---|
| Bounce concentrated in one room | Localized joist rot or damage; possible subfloor delamination | Joist sistering or replacement; subfloor patching |
| Bounce across whole floor; older home | Undersized or over-spanned joists (common pre-1970 construction) | Mid-span beam addition or joist sistering |
| Bounce + musty smell in crawl | Moisture damage to joists and subfloor from crawl space conditions | Floor joist repair + crawl space encapsulation |
| Bounce near wall; visible sag from crawl | Rim joist or sill plate rot at perimeter; joist bearing failure | Sill plate replacement; rim joist repair; joist shoring |
| New bounce after water event | Subfloor delamination or joist compromise from water exposure | Water damage reconstruction; subfloor and joist scope |
When to Call — Today vs. Later
Not every symptom requires immediate action. Some are structural emergencies that get worse fast and more expensive the longer you wait. Others are stable conditions that can be scheduled at your convenience. Here's how to tell them apart.
Call the Same Week
- You can feel visible deflection under load
- Bounce is getting noticeably worse month over month
- Musty smell coming up through floor registers
- Cracking sounds when walking across the floor
- Floor starting to show visible dip or sag from above
Safe to Schedule
- Slight bounce present for years with no progression
- Bounce only in one known over-spanned location
- Bounce you already had inspected by a structural engineer
- Bounce on a deck or porch that isn't a living space
- Bounce that fully resolves when you add blocking
Pricing for bouncy floor repair depends on scope: a single sistered joist starts at $750, while a full crawl-space rebuild can reach $18,000 or more. Our Floor Joist Repair Cost Guide breaks down the scope tiers and price ranges for each.
See Floor Joist Repair Cost Guide →Stop Living With a Floor
That Moves Under You.
A bouncy floor is a structural problem that only gets more expensive to fix over time. The $350 diagnostic tells you exactly what’s wrong and exactly what it costs to fix it permanently — typically within three days of the inspection.
Serving Tacoma · Gig Harbor · University Place · Lakewood · Puyallup · Pierce County