Slab-on-Ground Performance Evaluation Part 2 of 2 (DC10.8)-Slab-on-Ground Performance Evaluation Part 2 of 2 (DC10.8)

Video Transcription

Video Summary

The Post-Tension Institute’s January 2026 webinar, moderated by Kyle Boyd with presenter Homer Parker, is a continuation of a series on performance evaluation of slab-on-ground foundations, focusing on assessment guidelines per PTI 10.8. The webinar covered classifying slab distress into cosmetic, functional, and structural categories, emphasizing the importance of distinguishing distress types for building performance assessment. Visual observations, elevation data, and distress pattern correlation are key tools for evaluating slab conditions. The presentation explained that foundation movements mostly result from soil conditions, such as expansive, stable, or collapsible soils, affecting slab behavior differently. Data collection methods include visual inspection, interviews, historic elevation data (OCE), geotechnical reports, and plumbing evaluations. The webinar clarified curvature and tilt calculations over a 25-foot chord, crucial for performance classification into acceptable, marginal, or unacceptable categories. Homer highlighted that “pool table flat” slabs are rare, with typical construction showing variations up to an inch. OCE data is most valuable when collected post-construction after floor coverings are installed, allowing for accurate performance comparisons. The webinar also touched on investigating post-tension tendons and emphasized monthly webinars planned through 2026 covering certification, detailing, and construction practices. Attendees receive continuing education credits, and questions can be directed to PTI or Homer with materials accessible online.

Keywords

Post-Tension Institute

slab-on-ground foundations

PTI 10.8 guidelines

slab distress classification

foundation movement

soil conditions

curvature and tilt calculations

OCE data collection

post-tension tendons