Case Histories

Private Sector

Corrosion Compromising Integrity of Structural Steel Floor

Corrosion Compromising Integrity of Structural Steel Supporting Floor
Corrosion Compromising Integrity of Structural Steel Supporting Floor
Corrosion and slime on floor beams in a crawlspace
Corrosion and slime on floor beams in a crawlspace

Location: Crawlspace beneath a grocery store

Material: Wide Flange Steel Beams, Steel Decking, Concrete Floor

Background: A corrosion investigation was performed in a 100,000 ft2 store crawlspace which was built over what was once a low lying marsh and landfill site. The wide flange steel beams had severely corroded reducing their life assessment to only an additional 2 to 5 years. Additionally, severe deterioration to the underside of the floor was detected, requiring immediate repair.

Service Life: The grocery store was built 15 years prior to the corrosion inspection.

Findings: The corrosion inspection concluded that there was virtually no air movement in the crawlspace area. The lack of air movement combined with the extremely wet environment of the crawlspace had resulted in this severe condition. Recommendations were provided for the repair of the concrete and to increase airflow and reduce moisture in the crawlspace to mitigate the corrosion problem and increase the life expectancy of the floor structure.