Hyproof SOM (Spray On Membrane)

A cold applied, moisture cured, single component waterproofing membrane using polyether technology. May be used in a two-ply, fabric reinforced application or in a single ply application. Fast curing elastomeric membrane which cures into a seamless monolithic rubber-like system that is resistant to thermal shock.

Product Highlights

  1. Solvent free
  2. Moisture cure
  3. High solids will not shrink
  4. No outgassing on damp surfaces
  5. Bonds to green concrete
  6. Wet film thickness equals dry film thickness
  7. Non flammable
  8. Very fast setting – Two coats in one day
  9. Very low odor
  10. May be used in confined spaces
  11. Conforms to OTC Rule for Sealants
  12. Conforms to USDA Requirements for Non-food Contact
  13. Meets requirements of California Regs: CARB and SCAQMD
  14. This product does not contain cancer causing chemicals listed in California Proposition 65
  15. NAHB Model Green Home Building Guidelines: 5 Global Impact Points
  16. VOC Content: Less than 36 grams /liter ASTM D2369 EPA Method 24 (Tested at 240 ̊ F / 115 ̊ C)

Applications and Packaging


  • Below grade waterproofing
  • Horizontal between slab underlayment
  • Plaza Decks
  • Balconies
  • Tunnels


  • Black Colored
  • 5 Gallon Pails
  • 36 Pails per pallet

Substrates and Performance Properties

  • The substrate should be smooth, level, clean, and dry.
  • Include but not limited to Wood, Masonry, Steel, Aluminum, Stone, Galvanized Metal, Asphalt BUR, Modified Bitumen, EPS Protection Board, Styrofoam Protection Board, and Concrete.
  • Hyload SOM 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

Grade Spray Applied
Viscosity 35,000 cp +/- 10,000 cp Brookfield RVF TE Spindle, 4 RPM, 73°F (23°C
Density 10.9 +/- 0.2 lbs per gallon ASTM D1475
Tack Free Time  60 min +/- 20 min  45 +/- 5 % R.H.
Solid Content by Weight 95% ASTM C1250
Hardness Shore OO  70 ASTM D2240
Average Permeability  0.085 perm inches ASTM E96
(Vertical) Film Thickness  PASS ASTM C1375
Adhesion- in-Peel  PASS ASTM C794
Extensibility Heat Aging  PASS ASTM C1522
Service Temperature  -40°F to 200°F (-40°C to 93°C)

Shelf Life

Six months from date of manufacture when stored at 70°F / 21°C with 50% relative humidity. High temperature and high relative humidity may significantly reduce shelf life.

Limitations and Warranty

  • Hyproof SOM is not intended for use with a permanently exposed surface
  • In areas where prolonged chemical exposure is anticipated, contact Technical Services for recommendations.
  • Do not use in above grade applications without a protective UV barrier.
  • If Hyload SOM is to be coated with a UV barrier, test for asphalt staining before coating.
  • Do not store in elevated temperatures.
  • Remove all coatings and sealants before application.
  • Do not apply at temperatures below 35°F (2°C).


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.