Jason A. Aspin

Associate Principal


Jason Aspin’s work focuses on the investigation, design development, and construction of roofing and waterproofing projects. He has extensive experience with low-slope roofing (built-up, modified bitumen, and single-ply membranes) and steep-slope roofing (clay tile, slate, shakes, sheet metal, and shingles). Mr. Aspin also has significant experience with a wide variety of plaza and below-grade waterproofing systems.



  • Basilica of St. Adalbert - Grand Rapids, MI: Copper dome recladding
  • Blackstone Hotel - Chicago, IL: Mansard sheet metal replacement
  • Cascade County Courthouse - Great Falls, MT: Copper dome restoration
  • CoreSite Data Center - Chicago, IL: PVC installation
  • Loyola University, Cudahy Science Hall - Chicago, IL: Clay tile replacement and copper dome recladding
  • Joliet Junior College - Joliet, IL: Campus roofing condition survey
  • Lake Point Tower - Chicago, IL: Modified bitumen replacement and concrete structural slab repair
  • NASA Vehicle Assembly Building - Cape Canaveral, FL: Roofing condition survey
  • Nebraska State Capitol - Lincoln: Flat lock and batten seam copper sheet metal replacement
  • Old Cook County Hospital - Chicago, IL: Exterior wall built-in gutters
  • Olympia Fields Country Club - Olympia Fields, IL: Modified bitumen replacement
  • Omaha World-Herald - Omaha, NE: Prefinished galvanized standing seam investigation
  • Parc Huron - Chicago, IL: PVC replacement
  • San Jacinto Museum of History - La Porte, TX: Built-up replacement and sheet metal flashing repairs
  • Richard J. Daley Center - Chicago, IL: Coating existing built-up
  • The Heart Hospital at Deaconess Gateway - Newburgh, IN: Thermoplastic olefin failure investigation and replacement
  • Railway Exchange Building - Chicago, IL: Modified bitumen replacement and terra cotta cornice restoration
  • The Rookery - Chicago, IL: PVC recovery of existing roofing
  • Tribune Tower - Chicago, IL: Modified bitumen replacement
  • Yale Center for British Art - New Haven, CT: Modified bitumen replacement and skylight repair



  • Aon Center - Chicago, IL: Plaza expansion joint replacement
  • Apple Michigan Avenue Store - Chicago, IL: Waterproofing consulting
  • Carl Sandburg Village - Chicago, IL: Plaza renovation
  • University of Chicago, Gordon Center for Integrated Sciences - IL: Foundation wall crack injection and repairs
  • Lake Point Tower Skyline Park - Chicago, IL: Park expansion joint replacement and flashing repairs
  • O'Hare International Airport - Chicago, IL: Tunnel expansion joint repairs
  • Palmolive Building - Chicago, IL: Vaulted sidewalk replacement
  • Renaissance Place - Highland Park, IL: Split slab waterproofing replacement
  • Richard J. Daley Center - Chicago, IL: Foundation wall crack injection and repairs; granite exterior stair reinstallation
  • The Rookery - Chicago, IL: Vaulted sidewalk replacement
  • Chicago Federal Center Plaza - IL: Granite plaza waterproofing replacement


Leakage Investigation

  • 150 North Riverside - Chicago, IL: Parking garage and curtain wall
  • Loyola University, Information Commons - Chicago, IL: Amenity deck and clay tile roofing
  • Loyola University, Madonna Della Strada Chapel - Chicago, IL: Modified bitumen roofing and sheet metal flashing
  • McCormick Place Marriot - Chicago, IL: Single-ply roofing
  • Metra Millennium Station - Chicago, IL: Bridge deck (ceiling) above station
  • Museum of Science and Industry - Chicago, IL: Entry kiosks
Professional Affiliations

ASTM International
International Institute of Building Enclosure Consultants (IIBEC)


Architect in IL


University of Illinois at Urbana-Champaign
Bachelor of Architecture, 1994
Master of Architecture, 1996