Reinforced subfloor and crawl space supports in a Tacoma home by adding new joists, posts, and pier pads, correcting beam alignment, and replacing the vapor barrier to eliminate sagging floors and improve structural stability.
Structural Repair
Overview
Location: Tacoma, WA
Service: Floor Support & Vapor Barrier Replacement
Home Type: Single-Family Residence
Issue: Uneven floors and inadequate crawl space support
Goal: Reinforce subfloor structure, stabilize beam line, and replace damaged vapor barrier
The Challenge
Subfloor Splicing Weak Points: Areas where original shiplap and newer particle board met had insufficient support, leading to flexing and sagging.
Improper Post Installation: Several posts rested directly on soil or gravel without proper piers, increasing vulnerability to rot and instability.
Moisture Retention: The existing vapor barrier was damaged, allowing damp air and soil gases to circulate freely under the home.
Key Takeaway
A Tacoma homeowner contacted Chumley Structural & Foundation Repair after noticing sagging floors and instability beneath key areas of their home, particularly around the center span beam and bathroom. Upon inspection, our team identified multiple points of weakness in the subfloor splicing and crawl space support system, as well as a deteriorated vapor barrier contributing to moisture concerns.
Our Solution
Subfloor Reinforcement: Installed new 4×6 joist sections and dual vertical posts on 18” precast pier pads beneath splice points to restore proper load transfer. Additional joist hangers and SD fasteners secured connections between old and new framing.
Post & Pier Adjustments: Replaced stacked and leaning posts with properly plumbed, bracketed posts anchored to new concrete pads. Introduced six structural adjustments and three new pier pads to stabilize the main beam line.
Vapor Barrier Replacement: Removed torn, ineffective visqueen and installed a new 6 mil vapor barrier to improve ground moisture control and protect new structural components.
Results
The crawl space now provides stable, code-compliant support throughout the home. The reinforced beam line and subfloor connections restored floor integrity, while the upgraded vapor barrier reduced humidity and helped prevent long-term decay. The homeowner can now move forward confidently with remodeling plans knowing the foundation beneath is secure and durable.
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