Greg Andrews

Mr. Greg Andrews

National Tile and Stone Authority
8833 Winnetka Ave. #243
Winnetka , CA 91306
Mobile: 805-341-5570


National Tile and Stone Authority, Inc., is an independent consulting firm providing litigation support regarding losses encountered by individuals and companies in the tile and stone industry. Founders Greg Andrews and Gil Chotam are both well-trained professionals with many years of experience and individual areas of expertise. NTSA services include Failure investigation analysis; inspection, testing, observations and report writing. We would be pleased to discuss the aspects of your case with you.

Greg, is recognized nationally as the country's leading pool tile expert with a unique and specific expertise in glass and stone mosaics.
His unique experience includes specialties in product selection, waterproofing, installation and forensic investigation analysis of all submerged tile and stone applications. Greg has published numerous articles on the topics of tile and waterproofing in submerged applications and is frequently engaged as a speaker and instructor at conferences across the country.

Gil expertise is ceramic tile and stone installation in residential and commercial applications with a special emphasis on stone selection and installation. Gil has also spent over 15 years in consulting and litigation support. Gil has managed several large commercial tile and stone companies and is well versed in office administrative duties.

Areas of Expertise

  • Brick & Stone
  • Concrete/Cement
  • Construction
  • Construction Damages
  • Construction Site
  • Contractor's Licensing
  • Flooring
  • Lath & Plaster
  • Pools & Spas
  • Scheduling Delay & Analysis
  • Tile


Available Upon Request