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HyProof GL (Grid Lock)

HyProof GL (Grid Lock) Coal Tar Elastomeric (CTEM) Waterproofing Membrane

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

  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.


  • 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)

  • 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 Strength ASTM D 638 1050 psi min
Heat Aging ASTM D 3045 1250 psi min
Low Temperature Band ASTM D 2136 PASS
Hydrostatic Pressure Resistance  ASTM D 751 290 psi*
Water Absorption ASTM D 5147 0%
Water Vapor Permeance ASTM E 96 0.375 perm max
Puncture Permeance  Federal Method 2065 50 lbs. min
Tear Resistance  ASTM D 1004 250 lb. / in min

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.

  • 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.


For warranty information, click here.

Tie-in of HyProof GL to Existing System

HyProof GL System

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