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For nearly 15 years, Twining roofing and waterproofing division has earned a reputation as Southern California’s premier roofing and waterproofing consultant. We don’t simply observe the installation of your roofing system, we take great care to ensure that this asset is the proper system, that installation is in accordance with manufacturer recommendations, and that maintenance procedures are developed and followed.

With the unending introduction of new products for the roofing and waterproofing industries, and the subsequent methods of application for the new materials, our professionals have successfully remained at the forefront of consulting and inspection for various roofing and waterproofing systems. Our main services include:

  • Existing Properties
    • Roof surveys and evaluation of existing roofing systems
    • Leak investigations
    • Roofing system evaluation of commercial/industrial properties for acquisition purposes
    • Preparation of specifications and bid documents
    • Bid administration
    • Quality assurance inspections
    • Litigation support and expert witness services
  • New Construction
    • Review roofing/waterproofing specifications and drawings
    • Approval of submittals
    • Quality assurance inspections

Twining has been selected to perform a wide array of roofing and waterproofing inspection services on large and complex structures, many with extensive subgrade areas requiring absolute watertight conditions.