Roofing and Waterproofing

Alcal has been a leading installer for roofing and waterproofing products for over 40 years. We are experienced in commercial, residential, industrial and public works projects. Whether it’s new construction, roof replacements or a leak repair, we’ll get the job done right.




  • Asphalt Shingles
  • Wood Shingles and Shakes
  • Built-Up and Modified Roof Systems(Hot Asphalt, Cold Adhesive, Self-Adhered,and Torch Applications)
  • Single Ply Roof Systems
  • Metal Roof Systems
  • Concrete and Clay Tile Roof Systems
  • Slate Roof Systems
  • Fluid-Applied Roof Systems
  • Green Roof Systems
  • Roof Coatings
  • Pedestal Paver Systems
  • Below-Grade Waterproofing
  • Solar Photovoltaic Systems





  • New Construction
  • Roof Inspections
  • Emergency Leak Remediation
  • Preventative Roof Maintenance
  • Tenant Improvement Repairs
  • General Roof Repair and Restoration




Reference Projects

Letterman Digital Arts
Yahoo Campus
East Asian Library
UC Santa Cruz Digital Arts
Nasa Ames Research Center
Genetech Building 31
Belovida at Newbury Park
Allure Towers Waikiki
Kaneohe Military Housing
University of Hawaii, West Oahu Campus
First Hawaiian Bank, Guam