Case Study: HOA Parking Lot Renovation in the Portland Metro

The Challenge: A Parking Lot Past Its Prime

A 72-unit condominium complex in the Portland metro area contacted Cojo Excavation and Asphalt about their deteriorating parking lot. The lot served 90 parking spaces across two connected sections and had not received significant maintenance in over 12 years.

The HOA board had been patching potholes and filling cracks for years, but the problems had reached a point where patching was no longer keeping up with the rate of deterioration. Residents were complaining about vehicle damage, the board was concerned about liability, and the property's curb appeal was suffering.

What We Found During Assessment

Our initial site assessment revealed several issues:

• Widespread alligator cracking covering approximately 35% of the lot surface, concentrated in the main drive aisle and the north section
• 12 active potholes ranging from minor surface defects to 3-foot-wide base failures
• Drainage failure in the northeast corner where water pooled after every rain, saturating the base and accelerating deterioration
• Faded striping throughout, with ADA spaces no longer meeting visibility requirements
• Two ADA spaces that no longer met slope requirements due to settling (measured at 3.8% and 4.2% cross-slopes, exceeding the 2% maximum)
• Crumbling curbing along the south edge where tree roots had pushed up the asphalt

The base condition was the deciding factor. Core samples showed that the aggregate base in the north section had been contaminated by fine soil pumping up through the base layer, a common problem in the Willamette Valley's clay-heavy soils. The south section's base was still sound, making it a candidate for overlay rather than full replacement.

The Solution: Phased Renovation

Working with the HOA board, we designed a two-phase project that kept parking available for residents throughout construction.

Phase 1: North Section (Full Replacement)

The north section required complete removal and reconstruction:

1. Demolition: Removed existing asphalt and contaminated base material (4 inches of asphalt, 8 inches of base)
2. Subgrade preparation: Installed geotextile fabric over the clay subgrade to prevent future soil contamination of the base
3. New aggregate base: Installed 10 inches of 3/4-inch minus crushed rock in two lifts, compacted to 95% density
4. Drainage correction: Regraded the northeast corner and installed two additional catch basins connected to the existing storm drain system
5. Paving: Installed 3.5 inches of Level 2 hot-mix asphalt in two lifts (2-inch base course, 1.5-inch surface course)
6. Curb repair: Replaced 120 linear feet of damaged curbing along the south edge

Phase 2: South Section (Mill and Overlay)

The south section's sound base allowed for a less invasive approach:

1. Milling: Removed the top 2 inches of deteriorated asphalt using a milling machine
2. Crack repair: Sealed all cracks in the remaining base course with hot-pour crack sealant
3. Pothole repair: Four potholes with localized base failure were excavated and patched with new base material and asphalt
4. Leveling course: Applied a leveling course to correct minor surface irregularities
5. Surface course: Installed 2 inches of Level 2 hot-mix asphalt

Final Work (Both Sections)

After paving was complete on both sections:

• ADA upgrades: Regraded two accessible spaces to meet the 2% maximum slope requirement and added one additional accessible space to meet the current count requirement for 90 total spaces
• Full restriping: Applied thermoplastic markings for ADA spaces and fire lanes, and traffic paint for standard stall lines and directional markings
• New signage: Installed ADA-compliant parking signs with Oregon-required fine amounts

Project Details

| Item | Detail | |------|--------| | Location | Portland metro area | | Property type | 72-unit condominium HOA | | Total parking spaces | 90 | | Project area | Approximately 27,000 square feet | | Phase 1 scope | Full replacement (north section, ~12,000 sq ft) | | Phase 2 scope | Mill and overlay (south section, ~15,000 sq ft) | | Construction duration | 8 working days (Phase 1: 5 days, Phase 2: 3 days) | | Total project timeline | 10 weeks (planning through completion) | | Parking maintained | Yes, phased construction kept 50%+ spaces available |

Challenges and How We Handled Them

Resident Parking During Construction

The biggest concern for the HOA board was maintaining resident parking throughout the project. We addressed this by:

• Dividing each phase into sub-sections so no more than 30% of spaces were offline at any time
• Providing 72-hour advance notice to residents before each sub-section closure
• Scheduling work to open completed sections as quickly as possible
• Coordinating with the property manager to designate temporary overflow parking on adjacent streets

Weather Delays

Oregon weather in early June can be unpredictable. We built three contingency days into the schedule and maintained a flexible crew schedule. One rain day during Phase 1 pushed completion back by one day, which was absorbed by the contingency buffer.

Tree Root Damage

Three mature trees along the south edge had roots that had lifted curbing and cracked adjacent pavement. Rather than removing the trees (which the HOA wanted to preserve), we:

• Installed root barriers along the new curb line to prevent future intrusion
• Added 2 extra inches of aggregate base depth in the affected area
• Used a slightly thicker asphalt section to bridge over remaining root zones

Results

The completed renovation delivered:

• Smooth, well-drained parking surface with proper slopes directing water to catch basins
• Full ADA compliance with correctly sized and sloped accessible spaces, proper signage, and accessible routes to building entrances
• Professional appearance that improved the property's curb appeal and resident satisfaction
• 15-20 year expected lifespan with the maintenance plan we provided to the HOA board
• Reduced liability exposure from eliminated potholes, proper drainage, and compliant ADA parking

The HOA board reported that resident complaints about the parking lot dropped to zero after completion, and the property manager noted improved curb appeal during prospective buyer tours.

Lessons for HOA Boards Planning a Paving Project

Based on this project and similar HOA work, here are key recommendations:

1. Start your reserve fund early. Parking lots need replacement every 20-25 years. Your reserve study should be funding this from day one.
2. Do not defer maintenance. The north section's full replacement cost roughly twice as much per square foot as the south section's overlay. Earlier intervention with sealcoating and crack sealing could have saved the HOA significant money.
3. Phase the work. Residents need parking. Plan construction in phases even though it costs more.
4. Address drainage. Water damage was the primary cause of failure in this lot. Fixing drainage during renovation prevents the same problem from recurring.
5. Budget for ADA. Standards change, and settling creates slope violations over time. Every renovation should include ADA assessment and corrections.

Planning an HOA Parking Lot Renovation?

Cojo Excavation and Asphalt works with HOA boards and property managers across Oregon's I-5 corridor to plan and execute parking lot renovations that work for residents and budgets. We provide phased construction options, detailed bid proposals, and honest assessments of what your lot actually needs.

Call 541-409-9848 or request a consultation to discuss your HOA's parking lot.