HyProof GL (Grid Lock)

A coal tar elastomeric (CTEM) waterproofing membrane. Its primary components are coal tar pitch, PVC, and DuPont ® Elvaloy ® KEE resin.
Tech Data PDF

Product Highlights

  1. Seams can be hot air welded or sealed with Hyload Structural Sealant.
  2. Resistant to oils, greases, petroleum products, acids, bases, glycols, and many other chemicals.
  3. Will not support biological growth such as molds or algae.
  4. Will not allow root penetration.
  5. Can be applied horizontally under poured concrete or pavers.
  6. Can be used under a green roof, or vegetative garden, or garden wall.
  7. Compatible with most sealants and coatings.

Applications and Packaging


  • Vertical below grade
  • Horizontal underlayment
  • Under a vegetative system


  • Black Colored Membrane
  • 36”’ x 50’ Rolls
  • 35 Rolls per pallet
  • Available in 60 and 75 mil Thickness
  • 63 lbs. per roll (60 mil)
  • 76 lbs. per roll (75 mil)

Substrates and Performance Properties

  • The substrate should be smooth, level, clean, and dry.
  • Include but not limited to Wood, Masonry, and Concrete.
  • Hyproof GL can be installed directly over existing Hyload membranes without priming. Priming with Hyload Asphalt Primer or Hyload HyPrime is recommended on all other substrates.

Performance Properties

Tensile StrengthASTM D 6381050 psi min
Heat AgingASTM D 30451250 psi min
Low Temperature BandASTM D 2136PASS
Hydrostatic Pressure Resistance ASTM D 751290 psi*
Water AbsorptionASTM D 51470%
Water Vapor PermeanceASTM E 960.375 perm max
Puncture Permeance Federal Method 206550 lbs. min
Tear Resistance ASTM D 1004250 lb. / in min

Technical Data

Hyload provides technical data as well as installation instructions, details, and specification information to authorized waterproofing contractors, engineers, architects, and specifiers. This information can also be provided to designers in various formats used by engineering professionals. Contractor field training, as well as in-house instruction, is used to develop certified applicators nationwide. In conjunction with The Technical Department, field inspections are performed by Hyload Representatives trained to perform pre-bid, job progress, and final inspections.

Limitations and Warranty

  • Cannot be applied over a surface contaminated with dust or debris.
  • Must be rolled vertically using a small hand held rubber wheeled roller.
  • Must be rolled horizontally using a large water filled “garden” type roller, or a rubber coted “linoleum” type roller. Care MUST be taken not to penetrate the membrane while rolling.


Hyload makes available to its customers several high performance product warranties.  Contact Hyload’s Corporate Office directly for details. A standard warranty is 10 years.

CAD Details

Tie-in of HyProof GL to Existing System
  • Details (PDF)
  • HyProof GL System
  • Over Existing Coal Tar (PDF)