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 various plaza and below-grade waterproofing systems.







  • Basilica of St. Adalbert - Grand Rapids, MI: Replacement of clay tile on gable roof and replacement of copper shingles on dome
  • Blackstone Hotel - Chicago, IL: Installation of new, prefinished galvanized standing seam panels on mansard
  • The Heart Hospital at Deaconess Gateway - Newburgh, IN: Single-ply roofing failure investigation
  • Joliet Junior College - Joliet, IL: Campus roofing condition survey
  • Lake Point Tower - Chicago, IL: Modified bitumen roofing replacement and concrete structural slab repair
  • Loyola University, Cudahy Science Hall - Chicago, IL: Clay tile replacement on gable roof; standing seam copper panels and built-in copper gutter replacements on dome
  • Nebraska State Capitol - Lincoln: Flat lock and batten seam copper sheet metal replacement
  • Olympia Fields Country Club - Olympia Fields, IL: Modified bitumen replacement
  • Parc Huron - Chicago, IL: Single-ply roofing failure investigation
  • Railway Exchange Building - Chicago, IL: Modified bitumen replacement and terra cotta cornice restoration
  • Richard J. Daley Center - Chicago, IL: Investigation of existing, built-up coating
  • The Rookery - Chicago, IL: PVC recovery of existing roofing
  • University of Illinois at Urbana-Champaign, St. John’s Catholic Newman Center - IL: Single-ply roofing failure investigation
  • San Jacinto Museum of History - La Porte, TX: Built-up roofing replacement
  • Tribune Tower - Chicago, IL: Replacement of existing built-up roofing with new modified bitumen roofing
  • Yale Center for British Art - New Haven, CT: Modified bitumen replacement and skylight repair



  • Aon Center - Chicago, IL: Entry plaza renovation and expansion joint replacement
  • Apple Michigan Avenue Store - Chicago, IL: Waterproofing consulting
  • Chicago Federal Center Plaza - IL: Waterproofing and granite paver replacement
  • Lake Point Tower Skyline Park - Chicago, IL: Park expansion joint repairs
  • Marshall Field’s (now Macy’s) - Schaumburg, IL: Plaza renovation
  • O'Hare International Airport - Chicago, IL: Below-grade expansion joint repairs
  • Palmolive Building - Chicago, IL: Vaulted sidewalk replacement
  • Richard J. Daley Center - Chicago, IL: Foundation wall crack injection and repairs
  • The Rookery - Chicago, IL: Vaulted sidewalk replacement
  • University of Chicago, Gordon Center for Integrated Sciences - IL: Foundation wall crack injection and repairs


Leakage Investigation

  • 150 North Riverside - Chicago, IL: Parking garage and curtain wall
  • Clubhouse Apartments - Louisville, KY: Investigation of breezeway water leakage, exterior wall water leakage, and roof cavity condensation
  • Loyola University, Klarchek Information Commons - Chicago, IL: Investigation of terrace, clay tile roofing, built-in copper gutters, and precast exterior wall water leakage
  • Metra Millennium Station - Chicago, IL: Investigation of bridge deck (ceiling) above station
  • Museum of Science and Industry - Chicago, IL: Investigation of water leakage through entry kiosks, entry drive, and entry drive expansion joints
Professional Affiliations

ASTM International


Architect in IL


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