Optimus ERM 2020

Optimus Elastomeric Roofing Membrane ERM 

Product Description

Optimus ERM2020 is a high solids, single component, multifunctional acrylic with urethane additives. ERM is specifically designed as a roll-down or spray applied elastomeric waterproofing, reflective roof membrane.  
The product system: ERM when use with the specified fabric, provides a monolithic, structurally sound, elastomer that is very weather resistant and easy to apply.
The polymer structure is very adhesive, reflective. ERM is designed four toughness with color retention, is  tough, abrasive resistant, non-brittle, flexible, good set times with impact resistance. 
Optimus ERM2020 is compatible with other Madison products for substrate repair and patching, see data on 4020 and 3030.
The ERM system product conforms to the requirements of the EPA’s Energy Star program, the Cool Roof Council, and California’s Title 24 requirements.

Unique Characteristics:  Optimus ERM contains extremely small, high strength fibers.  These “nano” type fibers are stronger than steel of the same size and add additional strength to the elastomeric system. These fibers do not detract from the overall appearance of the membrane and blend exceptionally well within the matrix of the system. 


  • Industrial roof applications
  • Waterproofing parapet walls
  • Sealing roof penetrations
  • CMU sealing
  • Sealing over exposed foam
  • Sealing air ducts exterior
  • Waterproofing roof walkways

Advantages – ERM

  • a true monolithic roof system
  • Great cold weather stability
  • high tensile strength in fabric
  • excellent high elongation
  • Building energy consumption reduction
  • high UV resistance
  • sets quickly, good ponding water resistance
  • good working time 
  • excellent abrasive resistance
  • highly adhesive – bonds to many substrates

Preparation: The roof must be clean.  All repairs must have been completed, replacement of any structural elements and sheet items, etc. shall have been completed well before the application of the ERM.  The roof should be dry and any materials containing moisture shall be replaced or vented and dried.
The surface shall be free of any contaminants that would effect bonding, i.e., dirt, grease, peeling paint and loose or foreign materials.
Prepare parapet by removing cap, flashings as needed for replacement.  Prepare all roof penetrations using an application of ERM and the specified fabric. Apply a base coat of product, imbed the fabric and seal using a thin top coat. Make sure that crack, separations, etc. have been repaired properly with a compatible approved product.  Check mechanical units and structures for structural soundness.  Tighten and/or repair as needed before the application begins. 
Repaired roof sections:  apply ERM at a rate of approximately 1 gallon per 100 square feet of surface area and allow to set before proceeding with the overall application.

Exposed Concrete Surfaces:  where applicable, concrete must have a minimum 28 day cure prior to application.  Remove any curing agent, form release materials, oils, wax, moisture or any material that may effect bonding.  Clean and wash to remove contaminants and maintain pH 8.0-11.0.  *Perform a Moisture Vapor Test before making the coating application on concrete.  Provide rough profile minimum 2 mils. Review ASTM D4259 Abrading Concrete and ASTM F1869 Measuring Moisture Vapor Emission.  Seal/repair all bug-holes, cracks and spalls, see Madison data sheets on 820. 

Steel ladders, steel structural elements to be coated; Near white sand blast per SSPC-SP10/NACE 2.  Welds, seams, edges, etc. grind/blast smooth and provide 2 mil profile. Wood, Fiberglass: Water-blast and dry. Fill wood and fiberglass cracks, splits, voids or holidays using a compatible filler (Madsion 820). 
Steel/metal Priming – use Optimus 7010, allow a set time of about one to two hours before coating with a top coat specified for application over metal.  Consult Madison for product information.    Do not exceed 4 to 6 hours before primer is coated.  

Note:  Always test the primer and top coat for your application and before proceeding with the application.

Moisture Vapor Reduction:  Since concrete will out-gas causing pinholes, using the CMW  vapor barrier treatment for the concrete will reduce pinholes.

Applications: Application range: 50°F to 125°F. Apply not less 5°F above dew point.   Hot surface above 125°F will accelerate set and dry time, too hot of a surface should be allowed to cool before the application begins.  Viscosity can be lowered with the addition of about 5% water into the product.

Moisture & Rain:  Check the weather before the application.  Avoid making an application if freezing weather or rain is eminent within 24 hours.  

Rate:  Apply ERM at a rate of three gallon per 100 square feet of surface area in combination with the specified fabric.  
Final finish dry mil thickness shall be not less then 24 mils, not to exceed 40 mils dry.

Note:  The surface profile of the roof will often dictate the actual amount of product needed per square (100 square feet of surface area)  Some application may use more then three gallons per square.  A simple test can be done to determine the need material for the existing roof surface profile.  Consult your applicator for this prior to ordering product.
Remember to calculate for walls, penetrations, etc.  – these areas often require more product per square then the roof area.

Airless Equipment: 

  • minimum of three gallons per minute
  • 3000 psi
  • equipment shall be capable of pumping a product with a viscosity of 120 K.U.
  • Hose 5/8 inch i.d. @ 150 linear feet of hose.
  • Reverse-a-tip @ .028 - .050

Rollers:  18 inch & 9 inch contractor coating rollers, standard industrial roller,  short nap roller, about 1” nap or small hand roller with 1/8-1/4 inch nap or may be applied via a notched squeegee. 

Fabric Installation:  Imbed specified fabric on any perimeter parapet walls first.  Set fabric into wet ERM  at the full height of the wall section or  vertical surfaces extending a lap of about 12 inches on to the roof area. Immediately roll the fabric into the wet product to saturate the fabric.  Assure that the fabric is properly rolled into the wet product eliminating folds, air pockets, etc. Apply the top coat of product as soon as possible.  Lap successive applications of fabric at least 2 to 3 inches.

Roof Protrusions:  Cut specified fabric in a round shape with an “X” cut in the center to allow for the protrusion to enter through the fabric.  Apply a base coat of product, imbed the fabric using a roller or brush, smooth out and eliminate bubbles, etc.  apply a top coat as needed.

Coat #1 – 1.5 to 2 gallons per square
Coat #2 – 1 to 1.5 gallons per square
Surface coverage is profile (surface) dependent of the existing roof.
Recoat time window: 2-12 hours. Do not exceed twelve hours before recoating additional coats as needed.  If recoat window is exceeded, sand lightly to produce a profile, wipe with acetone and re-coat.  
Curing Time:   Approximately two-four hours for low foot traffic volume. Cure 5 to 8 hours for more foot traffic.  Test surface cure to be sure surface is ready before allowing access.  Cure is  dependent on environmental temperature and humidity.

General Physical Characteristics

Solids 98%
Pot Life n/a
Depending on environmental temperature and local humidity.
Working time on surface @ 70F 10-15 min. 
temperature dependant
Dry Time @ 75F   30 min. to 1 hr.
Tack Free ASTM D2471 1.5 to 2 hrs.  
Tensile ASTM D412  2800 psi/select   fabric
Tear Strength D470  350 lbs./in.    
Elongation ASTM D124   300%
Processing Temperature  70°F
Viscosity@ 25°C  K.U. 120 
V.O.C. Content none
UV Resistance   high
Reflectance 87% to 92%
Emissive   89% to 90%


Color:  White

Packaging:   Five gallon units

Limitations:  Note: product may set faster in hot or warm conditions and slower in cool or cold conditions. Pot life is effected by environmental temperatures.
Surface access time is effected by substrate temperature for final cure and property development. Do not apply in greater thickness then specified. Do not use on wet surfaces. **Do not use product that is hot over 90°F. Keep out of direct sunlight and store the product kits on wood pallets at room temperature. If using product that is excessively warm, apply a small amount first to determine the effect of heat on the set time.

This product is for use by professional applicators only. Wear Protective Clothing. Read MSDS before using this product. DOT/Flash Point – Non-flammable Liquid Classification, not regulated.