From Hidden Moisture to Structural Repair and Interior Renewal
During a flooring replacement, the contractor discovered staining and visible signs of moisture intrusion in the entry area. The homeowner then contacted us for a detailed inspection and assessment.
Below is a step-by-step overview of our investigation, findings, and corrective repairs, including targeted envelope improvements and coordinated reconstruction work.
View Project Below is a step-by-step overview of our investigation, findings, and corrective repairs, including targeted envelope improvements and coordinated reconstruction work.
before and after
step 1
visual inspection
Baseboard swelling observed under the stairs, consistent with moisture exposure.
Baseboard swelling observed in the under-stairs area indicates moisture absorption and material expansion, suggesting the presence of hidden water intrusion even where visible deformation appears minor.
Water-stained MDF and darkened drywall, consistent with moisture wicking.
Following baseboard removal, the MDF shows clear signs of water saturation, including brown staining and visible moisture wicking. The lower edge of the drywall is darkened, consistent with prolonged moisture exposure and migration through the assembly.
Dark microbial growth observed across the opened stud bay and OSB sheathing.
After opening the wall cavity and removing insulation, microbial growth is visible on the OSB sheathing, extending beyond the bottom plate and upward within the stud bay, consistent with prolonged moisture exposure.
Moisture-damaged bottom plate with staining and fiber deterioration.
The bottom plate shows advanced moisture-related deterioration, with dark staining, fiber breakdown, and delamination consistent with early-stage decay. Deterioration at the base of the stud bay indicates prolonged moisture exposure at the floor line.
Elevated wood moisture content (16.4%) measured at the bottom plate.
Moisture meter readings at the bottom plate indicate a wood moisture content of 16.4%, which is elevated for interior framing (typical dry range 8–12%). This suggests the assembly is still retaining excess moisture and has not fully dried.
Deck boards tight to siding; flashing missing at door and window.
The photo shows multiple water management deficiencies at the door, deck-to-wall interface, and window opening above.
- Decking is installed tight to the siding with no clearance, allowing capillary wicking and trapping moisture at the base of the cladding.
- No visible metal flashing or drip edge is present at the deck-to-wall transition, allowing runoff to migrate behind the bottom course of siding and into the lower wall assembly.
- The deck surface is positioned too high relative to the door threshold, increasing splash-back and direct moisture exposure at the sill and door-to-wall connection.
- Head (Z) flashing above the window is not visible, leaving the horizontal joint above the unit vulnerable to water intrusion behind the cladding.
step 2
Safe Removal
Front entry reconstruction in progress, including exposed sheathing and structural repairs to restore integrity after water damage.
Following a comprehensive inspection and evaluation, we identified multiple sources of water intrusion and moisture-related structural damage. Based on these findings, we recommended the following corrective actions:
• Removal of exterior sheathing and replacement of moisture-damaged structural components, including areas affected by wall settlement (approx. 3/8") at the primary leak location.
• Installation of proper waterproofing and WRB integration at all window openings to prevent future water intrusion.
• Antimicrobial treatment of exposed framing to help inhibit microbial growth.
• Opening of wall cavities to facilitate controlled structural drying and moisture removal.
• Replacement of the front door with a moisture-resistant composite or PVC unit.
• Installation of a sill pan to provide positive drainage at the door threshold.
• Correction of exterior water management deficiencies and improvement of moisture control.
• Replacement of the exterior landing and staircase due to advanced moisture-related deterioration.
• Providing proper clearance between decking and wall cladding to promote ventilation and prevent moisture entrapment.
Structural repairs were completed with integrated finish upgrades, improving both durability and overall appearance.
• Removal of exterior sheathing and replacement of moisture-damaged structural components, including areas affected by wall settlement (approx. 3/8") at the primary leak location.
• Installation of proper waterproofing and WRB integration at all window openings to prevent future water intrusion.
• Antimicrobial treatment of exposed framing to help inhibit microbial growth.
• Opening of wall cavities to facilitate controlled structural drying and moisture removal.
• Replacement of the front door with a moisture-resistant composite or PVC unit.
• Installation of a sill pan to provide positive drainage at the door threshold.
• Correction of exterior water management deficiencies and improvement of moisture control.
• Replacement of the exterior landing and staircase due to advanced moisture-related deterioration.
• Providing proper clearance between decking and wall cladding to promote ventilation and prevent moisture entrapment.
Structural repairs were completed with integrated finish upgrades, improving both durability and overall appearance.
Improper sealing at the door-to-wall connection, increasing the risk of moisture intrusion into the wall assembly.
A key deficiency is the lack of proper sealing between the door frame and the wall opening—a critical transition in the building envelope.
Proper installation requires backer rod, high-quality sealant, and waterproofing tape integrated with the weather-resistive barrier (WRB). This system controls sealant performance, prevents water and air intrusion, and directs moisture away from the wall assembly.
Without proper sealing, moisture can enter the wall cavity, leading to microbial growth, material deterioration, and reduced energy efficiency.
Proper installation requires backer rod, high-quality sealant, and waterproofing tape integrated with the weather-resistive barrier (WRB). This system controls sealant performance, prevents water and air intrusion, and directs moisture away from the wall assembly.
Without proper sealing, moisture can enter the wall cavity, leading to microbial growth, material deterioration, and reduced energy efficiency.
This window installation shows multiple waterproofing deficiencies that have allowed moisture intrusion into the wall assembly.
This window installation shows multiple waterproofing deficiencies that have allowed moisture intrusion into the wall assembly.
• Head flashing (Z-flashing) is not present, leaving the opening unprotected from water runoff.
• Improper WRB (weather-resistive barrier) integration, with missing membrane and incorrect shingle-style layering.
• Water can migrate behind the cladding due to inadequate flashing and drainage detailing.
• Adjacent window connections are not properly integrated.
• Sealant appears to be used as the primary waterproofing method instead of a properly layered flashing system.
These conditions allow water intrusion into the wall cavity and can lead to moisture-related structural damage.
• Head flashing (Z-flashing) is not present, leaving the opening unprotected from water runoff.
• Improper WRB (weather-resistive barrier) integration, with missing membrane and incorrect shingle-style layering.
• Water can migrate behind the cladding due to inadequate flashing and drainage detailing.
• Adjacent window connections are not properly integrated.
• Sealant appears to be used as the primary waterproofing method instead of a properly layered flashing system.
These conditions allow water intrusion into the wall cavity and can lead to moisture-related structural damage.
Moisture-damaged window opening with missing WRB and microbial growth.
The exposed window opening shows signs of chronic moisture intrusion, including staining and early microbial growth on the OSB sheathing. Missing or discontinuous WRB at the jamb and sill allows water to enter the wall assembly, indicating improper waterproofing beyond the window perimeter.
Improper door flashing and no sill pan, allowing water intrusion.
During demolition, improper water management became evident, including the absence of a sill pan or drainage system at the door assembly.
Although metal flashing was present at the deck-to-wall transition, it was incorrectly installed, with the WRB lapped behind rather than properly shingled over it. The deck was constructed flush with the interior floor, with no clearance for drainage.
These conditions allowed water to migrate directly toward and into the door assembly, resulting in moisture intrusion.
Although metal flashing was present at the deck-to-wall transition, it was incorrectly installed, with the WRB lapped behind rather than properly shingled over it. The deck was constructed flush with the interior floor, with no clearance for drainage.
These conditions allowed water to migrate directly toward and into the door assembly, resulting in moisture intrusion.
Improperly flashed deck ledger allowing moisture intrusion and wood deterioration.
The deck ledger board was installed without proper waterproofing, with no visible self-adhered membrane at the wall interface.
This leak-prone condition allows moisture to become trapped behind the ledger, leading to water intrusion, saturation of the OSB sheathing, and deterioration of structural framing over time.
This leak-prone condition allows moisture to become trapped behind the ledger, leading to water intrusion, saturation of the OSB sheathing, and deterioration of structural framing over time.
Severe deterioration at deck beam connection with wood fiber breakdown.
Advanced moisture-related deterioration is visible at the deck beam penetration into the wall assembly, consistent with prolonged moisture intrusion due to improper flashing and waterproofing.
This condition has led to significant structural damage requiring extensive repairs.
This condition has led to significant structural damage requiring extensive repairs.
Extensive moisture-related deterioration at the deck beam connection, with wood fiber breakdown and structural damage.
The following structural framing components were found to be moisture-damaged: exterior sheathing, studs, bottom plate, subfloor, rim joist, and top plate.
Such deterioration may result in drywall cracking, door frame distortion, and difficulty with door operation.
Structural repairs require proper evaluation, load management, and temporary support systems. Improper handling of load-bearing elements can lead to structural instability and safety risks.
A licensed contractor should perform a professional assessment and complete repairs to ensure structural integrity and long-term performance.
Such deterioration may result in drywall cracking, door frame distortion, and difficulty with door operation.
Structural repairs require proper evaluation, load management, and temporary support systems. Improper handling of load-bearing elements can lead to structural instability and safety risks.
A licensed contractor should perform a professional assessment and complete repairs to ensure structural integrity and long-term performance.
step 3
Reconstruction
Temporary shoring installed to support load-bearing wall during structural repair and stabilization.
Structural repairs require proper engineering evaluation, approved permits, and required inspections.
Work involving load-bearing components must include controlled load transfer, temporary shoring, and adequate structural support. Improper procedures can lead to structural instability and safety risks.
After permits were obtained, temporary supports were installed and damaged structural elements were safely removed and replaced.
Work involving load-bearing components must include controlled load transfer, temporary shoring, and adequate structural support. Improper procedures can lead to structural instability and safety risks.
After permits were obtained, temporary supports were installed and damaged structural elements were safely removed and replaced.
Removal of damaged sheathing and structural elements to expose wall assembly.
Removal of moisture-damaged exterior sheathing and structural elements to expose the wall assembly and prepare for structural repairs and reconstruction.
This stage focuses on eliminating compromised materials and providing access for proper waterproofing and rebuilding of the wall system.
This stage focuses on eliminating compromised materials and providing access for proper waterproofing and rebuilding of the wall system.
Reconstructed wall assembly with sheathing and WRB integration.
The scope included installation of new exterior sheathing and integration of the WRB system to establish continuous moisture protection at the wall assembly.
Work at this stage focuses on proper waterproofing integration and preparation for final cladding installation.
Work at this stage focuses on proper waterproofing integration and preparation for final cladding installation.
WRB installation with sealed wall penetration and integrated flashing.
At this stage, the wall assembly is rebuilt with new sheathing and a continuous WRB system to restore proper moisture protection. Special attention is given to sealing wall penetrations, where integrated flashing and tape are installed to create a watertight connection.
This approach ensures that water is directed away from the wall assembly and prevents moisture intrusion at critical transition points.
This approach ensures that water is directed away from the wall assembly and prevents moisture intrusion at critical transition points.
Waterproofing installed at door threshold to prevent moisture intrusion.
Preparation of the door opening, including installation of waterproofing at the threshold and surrounding wall assembly to prevent moisture intrusion.
This stage ensures proper drainage and protection at a critical transition point before door installation.
This stage ensures proper drainage and protection at a critical transition point before door installation.
Restored existing windows with integrated flashing and WRB detailing.
Existing windows restored and refinished, with integrated flashing and weather-resistive barrier detailing completed around the openings.
New exterior door installed and entry stairs in progress.
New exterior door has been installed and integrated into the wall assembly. Entry stair reconstruction is underway, with the new stair structure currently in progress.
Completed front entry with custom lighting and illuminated house numbers.
This final stage shows the completed front entry reconstruction, including the new exterior door, rebuilt stairs, guardrails, custom stair lighting, and illuminated house numbers. All finish details have been completed, resulting in a safe, durable, and visually cohesive entry sequence.
Honored by this thoughtful review and the trust behind it.
Serving Homeowners Across Washington State
HM-PRO provides water damage inspection, mold remediation, and structural repair services in Redmond, Bellevue, Sammamish, Mercer Island, Kirkland, and throughout King County, Washington. Our goal is simple: identify the cause, repair it correctly, and protect your home from recurring damage.
BOOK A FREE INSPECTION Contact
Phone: +1 (206) 530-0018
Email: 2065300018wa@gmail.com
Phone: +1 (206) 530-0018
Email: 2065300018wa@gmail.com
Business Hours
Mon–Fri: 9:00 AM – 5:00 PM
Sat–Sun: Closed
Mon–Fri: 9:00 AM – 5:00 PM
Sat–Sun: Closed
Location & License
Based in Redmond, WA
Licensed General Contractor — Washington State
Mikhail Makrushin
License #: HMPROL*792CH
HM-PRO — General Contractor
Serving King County, WA
Water damage inspection, mold remediation, and structural repair across Redmond, Bellevue, Kirkland, Sammamish, and Mercer Island.
Visible mold is a sign of a deeper MOISTURE issue — not the rOOT problem.
If the source isn’t identified, the damage will continue to SPREAD.
We help uncover the cause and define the RIGHT repair APPROACH.
If the source isn’t identified, the damage will continue to SPREAD.
We help uncover the cause and define the RIGHT repair APPROACH.
