MEL-ROL LM – Liquid Waterproofing Membrane

Product Data, W. R. MEADOWS

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Access Online Submittal SystemSingle-Component, Water-Based, Polymer-Modified, Cold-Applied, Waterproofing Membrane

MEL-ROL LM is a single-component, polymer-modified, cold-applied, water-based, liquid waterproofing membrane ideal for below-grade vertical seamless waterproofing applications. We have taken the same high quality rubber polymers found in W. R. MEADOWS’ successful MEL-ROL “peel and stick” membrane and converted them into a heavy-bodied, high solids, quick drying liquid membrane.

With MEL-ROL LM, installation time is reduced, utilizing either a spray or roller application. A variety of different protection courses, insulation boards, or drainage boards can be embedded into the membrane to create a superior waterproofing system. With the application of PERMINATOR® vapor barrier over the membrane, a composite system can be created that has the combined advantages of both “peel and stick” and liquid-applied membranes.

MEL-ROL LM can be used on new and remedial waterproofing applications on concrete or masonry block substrates. Since the formula is water-based, MEL-ROL LM can also be used on both ICFs and “green concrete” applications.


  • Waterproof – very low vapor permeability (perm rating).
  • Superior elongation – bridges minor cracks; will not become brittle with age.
  • Fully bonded – water will not run beneath the membrane.
  • High solids, single-component, fast drying formulation – easy to apply; low cost application equipment; eliminates two-component mixing problems.
  • Cold-applied/water-based – will not adversely affect insulated forms (ICFs) or various protection board options. Allows for application to damp or “green concrete.”
  • VOC content is 0.0 g/L. Produces no harmful odors.
  • Easy application – no heating necessary. Eliminates fire hazards associated with heating kettles. Apply with roller or airless sprayer.

5 Gallon (18.93 Liter) Pails
55 Gallon (208.20 Liter) Drums*
*special order only

20 – 25 ft.2/gal. (0.49 – 0.61 m²/L) @ 60 mils. Coverage dependent on substrate type, weather, and application conditions.

When stored indoors in original, unopened containers at temperatures between 40 – 90° F (4 – 32° C), shelf life is a minimum of six months from date of manufacture.


  • Complies with all current federal, state, and local maximum allowable VOC requirements, including U.S. EPA, SCAQMD, and OTC.
Total Cure Time
Service Temperature
Application Temp
Typical Value
16-24 hrs
-20° F – 140° F (-29° C – 60° C)
40° F minimum
20-25 ft.²/gal.
Test Method
Shore “00” Hardness
Water Absorption
0.03 Perms
ASTM C 836
ASTM C 836
ASTM D 412
ASTM D 1970
ASTM E 96, B
Composite (55 Mil Membrane/10 Mil PERMINATOR)
Peel Adhesion
Tensile Strength (Film)
7 lb./in. (125 g/mm)
5000 PSI (36 MPa)
ASTM C 794
ASTM D 412 (Die C)
ASTM D 412 (Die C)
Water Vapor Permeability
Water Absorption
Resistance to Hydrostatic Head
Puncture Resistance
0.02 Perms
48 PSI
22 lbf. (98 N)
ASTM E 96, B
ASTM D 1970
ASTM D 751
ASTM D 4833

Surface Preparation …
All surfaces must be clean (free of all coatings and curing compounds), free of frost, relatively smooth, and structurally sound. Patch any bug holes, tie holes, large gaps, or cracks with MEADOW-PATCH® 5 or MEADOW-PATCH 20 from W. R. MEADOWS. All loose laitance on the substrates, such as dirt, dust, loose stones, and debris, should be either swept or blown clean.

All shrinkage cracks less than 1/16″ (1.6 mm) should be pretreated with a 60-mil coat of MEL-ROL LM 6″ (15 cm) wide. All cracks greater than 1/16″ (1.6 mm) should be taped with DETAIL STRIP from W. R. MEADOWS prior to application of the membrane. For specific project recommendations, please contact W. R. MEADOWS technical services.

Mixing … MEL-ROL LM is designed to be used from the pail or drum with little or no mixing. However, if water appears on the surface, mix thoroughly with a low speed mechanical mixer prior to application.

Priming … To reduce blistering on concrete surfaces, a thin coat of MEL-ROL LM diluted with water may be required. (Approximate dilution ratio of MEL-ROL LM to water is between 4:1 and 5:1.)

Thoroughly mix primer with a mechanical mixer. Prime the entire concrete surface to be waterproofed by spraying or rolling on a single coat at a coverage rate of 100 – 150 ft.2/gal. (2.45 – 3.68 m2/L). Allow primer to dry (approximately one hour, depending on temperature and conditions).

Detailing … After surface preparations are complete, detailing should be addressed. The desired thickness of membrane coverage is 120 mils for inside/outside corners and non-moving and hairline cracks, as well as around drains and penetrations. Request and view the W. R. MEADOWS WATERPROOFING CONTRACTORS HANDBOOK for additional information.

Roller Application … MEL-ROL LM can be applied directly from the container using a ¾” (19.05 mm) nap roller. Apply in two coats, each 30 mils thick, allowing first coat to reach initial set prior to application of second coat.

Spray Application … MEL-ROL LM may be sprayed on vertical surfaces at a minimum coverage thickness of 60 mils wet (45 mils dry). A single coat may achieve desired coating thickness. However, if material slumps due to temperature or substrate conditions, two coats (30 mils wet) may be necessary. Apply the second coat after the first coat has dried (approximately one to two hours).

Spraying Equipment … MEL-ROL LM is most effectively applied by using the Graco HydraMax 350 or the Graco GH833 Big Rig.

The Graco heavy-duty texture gun is recommended for use with the following tips: For best results, use the 0.051″ (Graco GHD551) heavy-duty switch tip. For spraying of primer coat, a smaller orifice tip such as the 0.035″ (Graco GHD635) can be used. Tips should be reversible types for easy clean out.

Horizontal Application … For horizontal applications, use HYDRALASTIC 836 from W. R. MEADOWS.

Thickness Control … Frequently inspect surface area with a wet mil gauge to ensure desired consistent thickness is achieved. Porous substrates or masonry block walls may require additional coats to obtain desired thickness.

Cleanup … Material should not be left in the pump, lines, or gun when finished spraying. CAUTION: Solvents must not come in contact with MEL-ROL LM in the sprayer, as they will break the emulsion and plug up the entire sprayer system. After spraying, promptly flush water only (no soap) through the system until pump and hose are clear (approx. five gallons). Aromatic solvents, such as xylene or toluene (approx. two gallons), should be used for final flushing after water is flushed through the pump and lines.

Mineral spirits, paint thinner, gasoline, etc., must not be used to flush system. NOTE: Water must be flushed through the machine to remove any solvents prior to spraying of MEL-ROL LM.

Protection … Cover vertical applications with PROTECTION COURSE, MEL-DRAIN, or 10 mil PERMINATOR from W. R. MEADOWS. Surfaces must be covered within 45 days.

Backfilling … Allow 24 hours for complete cure of membrane prior to backfilling.

Do not freeze. Do not apply MEL-ROL LM on vertical projects if rainfall is forecast or imminent within 12 hours. Do not apply MEL-ROL LM or primer when air, material, and surface temperatures are expected to fall below 40˚ F (4.4° C) within four hours of completed application. Sprayed urethane foams applied over MEL-ROL LM can melt the membrane and cause delamination and failure due to the exothermic reaction that takes place after spraying the foam. These foams should not be sprayed over MEL-ROL LM. The use of MEL-ROL LM does not negate the need for relief of hydrostatic heads. A complete drain tile system should be placed around the exterior of footing and under slabs, as required.

May help contribute to LEED credits:

  • EA Credit 1: Optimize Energy Performance
  • IEQ Credit 3.1: Construction Indoor Air Quality Management Plan: During Construction
  • IEQ Credit 4.2: Low-Emitting Materials: Paints & Coatings
  • MR Credit 2: Construction Waste Management
  • MR Credit 5: Regional Materials

This material last updated November 2013.



W. R. MEADOWS, INC. designs, manufactures, and markets high-quality building materials for today's construction professionals. Products are sold through an authorized distribution network. The family-owned and operated company focuses on product quality, exceptional service, and trusted integrity since its founding in 1926.
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