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Type: Residential
Project: Single-Family Residences
Scope: Structural Repairs
Location: Erie, CO
Value: $14.0MM
Duration: Three Years
Description:
The foundation systems were designed based on geotechnical reports that underestimated the total amount of heave potential in the soil, which led to upward and inward movement of the caisson foundation systems, flatwork, patios and porches.
Project Scope:
• 30 homes
• Remove and replace all backfill material; civil repairs including grading, drainage and exterior perimeter drains
• Replace all foundation caissons with micro-piles
• Excavate crawlspace and install interior perimeter drains
• Install vapor barriers and ventilation systems
• Install structural steel/concrete floors; I-beam lateral supports and beam welding
• Remove and replace structural porch and patio, basement slab, driveway and sidewalk
• Install weather barrier and flashings on doors, windows and stucco
• Interior and exterior cosmetic repairs
Challenges:
• Homes remained occupied during construction
• Neighborhood safety critical
• Continuous, safe access to homes
• Access to basements and yards with tight adjacent property lines
• No staging area for materials or equipment
• Maintaining effective project coordination with a large number of stakeholders
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Type: Residential
Project: Single-Family Residences
Scope: Structural Repairs
Location: Highlands Ranch, CO
Value: $9.1MM
Duration: Four Years
Description:
Expansive soils and water problems created foundation movement throughout the sub-division.
Project Scope:
• 40 homes
• Full pier replacement and underpinning; remove and replace all backfill material
• Structural floor replacement
• Mold remediation with full containment procedures and protocols
• Replacement of foundation perimeter drain systems
• Grading, drainage and landscape repairs
• Structural porch and patio installation with new grade beams
• Basement slab, driveway and sidewalk removal and replacement
• Interior and exterior cosmetic repairs
• Remove and replace basement finishes; complete interior and exterior cosmetic repairs
Challenges:
• All homes remained occupied during construction
• Neighborhood safety critical throughout project
• Continuous safe access to homes
• Construction traffic control and material storage
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Type: Commercial
Project: Multi-Unit Apartment Complex
Scope: Structural Repairs/Building Envelope Repairs
Location: Highlands Ranch, CO
Value: $6.6 MM
Duration: 18 Months
Description:
Proactive building maintenance and upgrade program including structural repairs and building envelope restoration.
Project Scope:
• 20 occupied buildings
• Remove and replace 219 elevated concrete decks and 60 common stairways;
• Includes concrete removal and replacement, re-flashing, and waterproofing using the Grace Deck Prep system
• Remove wooden handrails; fabrication and installation of new upgraded metal handrails
• Remove and re-flash 559 fenestrations
• Remove and replace 87,000 square feet of stucco and stone veneer
• All associated cosmetic repairs
Challenges:
• Units occupied throughout construction
• Maintain normal, safe access to all units during construction
• Attention to health and safety of residents throughout ongoing active jobsite
• Zero tolerance for defects in waterproofing system
• Protecting workspace from elements and maintaining minimum temperatures required for waterproofing application.
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Type: Residential
Project: Multi-Unit Townhome
Scope: Building Envelope Repairs/Structural Repairs
Location: Denver, CO
Value: $2.3MM
Duration: Four Months
Description:
Inadequate design and installation of waterproofing materials at exterior concrete decks and doors, resulting in water intrusion at decks, sliders, French and Juliette doors.
Project Scope:
• 23 occupied buildings
• Remove and replace 154 elevated concrete decks.
• Includes removal of existing sub-floor materials, re-framing and installation of new decking; installation of re-designed drainage scuppers;
• Re-flashing and waterproofing using the Grace Deck Prep system; replacing concrete wear surface.
• Remove, re-flash and replace 180 sliding glass doors, 80 Juliette doors, and 62 French doors
• Remove and replace 14,400 square feet of siding
• Complete all associated interior and exterior cosmetic repairs
• Re-slope and caulk 151 garden-level windows
Challenges:
• Units occupied throughout construction
• Health and safety of residents throughout active jobsite
• Zero tolerance for defects in waterproofing system
• Minimal staging area for materials and equipment
• Strict adherence to project schedule
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Type: Residential
Project: Single-Family Residences
Scope: Structural Repairs
Location: Littleton, CO
Value: $1.5MM
Duration: Five Months
Description:
The subdivision had inconsistent fill, causing hillside creep and several homes to experience differential movement. The original foundation systems did not adequately support the structures.
Project Scope:
• Four 4,000 square foot homes
• Partial removal of basements; protection of remaining basement finishes
• Install 70+ hydraulically driven steel piers
• Install 10+ helical piers
• Install 20 micropiles
• Deep compaction grouting
• Install new interior drains and vapor barriers
• Repair structural floors and decks
• Repair stucco and building envelope
• Replace basement finishes
Challenges:
• Homes occupied throughout construction
• Deep piers (40 to 60 feet)
• Deep micropiles (80 to 100 feet)
• Steep slope limited access to back of homes
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Type: Commercial
Project: Multi-Unit Apartment Complex
Scope: Structural Repairs/Building Envelope Repairs
Location: Lakewood, CO
Value: $1.0MM
Duration: Five Months
Description:
Years of water intrusion due to inadequate flashing and waterproofing caused deterioration of common exterior stairway landings. To protect their real investment and eliminate safety concerns the ownership group replaced the landings and stairways.
Project Scope:
• Nine occupied buildings
• Remove and replace 18 common stairways and landings;
• Included demolition, re-framing, flashing, waterproofing, concrete, new concrete treads, and new railings
• Remove and replace 80 decks; included demolition, re-framing, flashing, and new TREX decking
• Remove and replace 36,000 square feet of composite siding
• Complete all associated cosmetic repairs
Challenges:
• Units occupied throughout construction
• Maintaining normal, safe access to all units
• Health and safety of residents throughout active jobsite
• Strict adherence to expedited project schedule
• Limited construction staging area and parking
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| Type: Residential
Project: Multiple Single-Family Residences
Scope: Structural Repair
Location: Broomfield, CO
Value: $980K
Duration: Seven Months
Description:
Expansive soils created concrete slab movement.
Project Scope:
• Nine homes
• Partial removal of basements; protection of remaining basement finishes
• Remove concrete basement floors; excavate soil and install new structural floor system
• Re-void foundations
• Install new foundation drain system
• Re-establish basement finishes
Challenges:
• Homes occupied throughout construction
• Tight site conditions
• Steep slope limited access to back of homes | | |
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Type: Residential
Project: Single-Family Residences
Scope: Structural Repairs
Location: Highlands Ranch, CO
Value: $750K
Duration: Six Months
Description:
Expansive soils created concrete slab and foundation movement in several homes.
Project Scope:
• Three homes
• Partial removal of basements; protection of remaining basement finishes
• Remove concrete basement floors; excavate soil and install new heavy-gauge steel structural floor system
• Underpin the foundations with a haunch; replace concrete support piers
• Level and re-void foundations
• Install new foundation drainage system
• Re-establish basement finishes
Challenges:
• Homes occupied throughout construction
• Restricted site access
• Excessive ground water encountered during underpinning operations
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Type: Commercial
Project: Commercial Credit Union
Scope: Structural Repairs
Location: Northglenn, CO
Value: $650K
Duration: Four Months
Description:
Design and construction defects caused settling problems in this commercial structure.
Project Scope:
• 4,200 square foot masonry building
• Containment of work areas
• Remove and replace tenant finishes
• Remove and replace mechanical systems, plumbing and electrical
• Remove and replace concrete floor
• Shore up structure per design plan
• Excavate, and remove and replace foundation elements
• Install new foundation drainage system
• Fabricate and install support column components
• Grading and drainage improvements to create positive drainage
Challenges:
• Security of financial services building and work areas
• Credit union business could not be interrupted
• Containments and negative pressure critical to business operations
• Timing for loud construction activities
• Safety for construction workers, employees and clients
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Type: Residential
Project: Single-Family Residences
Scope: Structural Repairs
Location: Littleton, CO
Value: $625K
Duration: Five Months
Problem:
Shifting and settling soils caused two houses to experience differential movement. The original foundation systems did not adequately support the structures.
Project Scope:
• Two 4,000 square foot homes
• Partial removal of basement; protection of remaining basement finishes
• Install 45 hydraulically driven steel piers
• Install 7 helical piers
• Install 32 helical tiebacks
• Install new interior drains and vapor barriers
• Repair structural floors and decks
• Repair stucco and building envelope
• Replace basement finishes
Challenges:
• Homes occupied throughout construction
• Deep tiebacks (80 to 100 feet)
• Steep slope limited access to back of homes
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Type: Residential
Project: Single-Family Residence
Scope: Structural Repairs
Location: Lakewood, CO
Value: $175K
Duration: Three Months
Description:
Poor drainage and high water table caused the soil under the basement structural floor to heave. After further investigation it was also determined that the floor was not properly built, steel support posts were not properly sized, basement soffits were poorly constructed, and the sewer main was crushed. These issues were creating cosmetic damage throughout the house.
Project Scope:
• 12,000 square foot home
• Partial removal of basement; protection of remaining basement finishes
• Demolition and re-construction of basement structural floor
• Excavate of soil under structural floor
• Replace steel support posts
• Install new foundation drain system
• Install new sealed vapor barrier
• Re-establish basement finishes
Challenges:
• Aggressive project timeline
• Limited working space under structural floor
• Compacted soil under structural floor needed to be removed with jackhammers
• Exterior appearance needed to remain "undisturbed" during project
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Type: Commercial
Project: Commercial Office Building
Scope: Structural Repair/Building Envelope Repair
Location: Littleton, CO
Value: $150K
Duration: Four Months
Description:
Expansive soils created foundation movement on the central and back walls of the building. Construction defects created water intrusion issues, causing mold growth and damage to structural members.
Project Scope:
• 5,000 square foot commercial building
• Containment of work areas
• Remove and replace tenant finishes
• Install 5 Ram Jack helical tiebacks
• Install 16 Ram Jack hydraulically advanced steel piers
• Mold remediation
• Install new foundation drainage system
• Remove and replace stucco facade
• Remove and replace windows, doors and framing
• Re-grade exterior to create positive drainage
Challenges:
• Ongoing business could not be interrupted
• Containments/negative pressure critical to business operations
• Timing for loud construction activities critical to business operations
• Safety for construction workers, employees and clients
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