O'Brill Company

Construction Specialty Suppliers

       6626 N. Milwaukee Ave.

Niles, IL 60714

773-775-1122 or 847-647-0005

FAX 847-647-7819

Since 1967

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NO. 716


Provides a cost effective waterproofing underlayment for asphaltic overlays.

SEALTIGHT MEL-DEK is a flexible, dependable roll-type waterproofing membrane designed for bridges, parking decks or other vehicular structures to be overlaid with an asphaltic wearing course.

Technical Description
SEALTIGHT MEL-DEK is a roll-type waterproofing membrane composed of a nominally 53 mil thick layer of polymeric waterproofing membrane on a shrink-resistant, heavy-duty 12 mil thick, polypropylene woven carrier fabric. The 2 components are laminated together under strictly controlled production procedures.

SEALTIGHT MEL-DEK Waterproofing System provides an excellent waterproofing membrane for bridges, parking decks or other vehicular traffic structures to be overlaid with an asphaltic concrete wearing course. Ideal for repair, maintenance or new construction applications.

Advantages and Benefits

bulletRequires no protection...can withstand the dynamic placement of hot asphaltic overlays
bulletProvides 3/4" membrane-to-membrane weld at seams for positive, monolithic protection
bulletFlexible, dependable, cost-effective and easy to install
bulletMeets a wide range of maintenance and new construction application needs

Application Tools


Manual Sprayer

Roofer's Knife

Lamb's Wool Roller

Water Roller

NOTE: For applications receiving overlays other than asphalt, please consult with W.R. MEADOWS TECHNICAL SERVICE.

SURFACE PREPARATION: New concrete surfaces are to be fully cured and dry or approved by the engineer. Surface is to be cleaned of all dust, dirt and debris just prior to priming. Existing concrete surfaces are to have a smooth, sound, monolithic surface, free of voids, spalled areas, sharp protrusions and loose aggregate. Remove all traces of old membranes, oil, grease or other contaminants.

TEMPERATURE: SEALTIGHT MEL-DEK may be applied in fair weather at air and concrete surface temperatures of 40F (4C) and higher.

JOINTS AND SLAB DRAINAGE: Apply a reinforcing strip of SEALTIGHT DETAIL STRIP over all non-working joints or cracks over 3/16" (4.76mm) wide before applying finished membrane.

Seal all terminations with SEALTIGHT POINTING MASTIC. Deck surface must provide proper pitch to gutters and drains. Drainage openings should be provided at the structural deck level to drain any water that penetrates the asphaltic concrete surface.

PRIMING: Prime all surfaces to be covered with SEALTIGHT MEL-PRIME Water-Base or MEL-PRIME Solvent-Base VOC Primer. Primer may be spray-applied or applied with a lamb's wool roller. Allow primer to dry until tack-free. Primed areas not covered in 24 hours must be reprimed. Coverage, 250 to 300 ft./gal. (6.14 to 7.36m/L).

APPLICATION METHOD: Apply MEL-DEK from low point to high point, in both the longitudinal and transverse directions. In the transverse direction, overlap in shingle fashion 2-1/2" (63.5mm) after removing the white polyethylene strip that exposes the 3/4" rubberized asphalt. This will give you the membrane to membrane weld at seams. Longitudinally, overlap 6" (150mm) and seal with Pointing Mastic. Once positioned, the MEL-DEK should be immediately hand rubbed onto the surface followed by a pressure-applied roll-pressing of the complete surface to assure positive adhesion. Seal all terminations with SEALTIGHT POINTING MASTIC.

NOTE: If a thickness greater than 125 mils is desired, overlap each roll of MEL-DEK 51%.

INSPECT AND REPAIR: Inspect thoroughly before covering and make any necessary repairs immediately. Patch all tears. Slit fishmouths and patch. Seal edges of all patches with SEALTIGHT POINTING MASTIC.

PAVING: Placement of the asphaltic concrete overlay should be accomplished as soon as possible after application of the MEL-DEK. A minimum 2" (50mm) compacted overlay thickness is required. The temperature of the asphaltic concrete at the time of compaction should be a minimum of 290F, and not exceed 340F. Protect the membrane surface from unnecessary traffic. Place the overlay from low point to high point with care and caution.

60' (18.29m) long x 38.5"(.98m) wide Rolls

180 ft. (16.72 m) of effective waterproofing coverage

Refer to Material Safety Data Sheet for complete Health and Safety information.

Thickness 65 mils
Tensile Strength, ASTM D 882
Fill 90 lbs
90 lbs. (40.82 Kg)/35%
90 lbs. (40.82 Kg)/45%
Puncture, ASTM E 154 275 lbs. (125 Kg)
Flexibility, ASTM D 146
   180 Bend, 1/4" (6.35mm) mandrel
   @ -26F (-32C)
Water Vapor Transmission, ASTM E-96 0.03 Perms
Water Absorption, ASTM D 1228 0.06%
Independent test report available upon request

This material last updated December, 2001.


W. R. MEADOWS, INC. warrants that, at the time and place we make shipment, our materials will be of good quality and will conform with our published specifications in force on the date of acceptance of the order. THE FOREGOING WARRANTY SHALL BE EXCLUSIVE AND IN LIEU OF ANY OTHER WARRANTY, EXPRESS OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ALL OTHER WARRANTIES OTHERWISE ARISING BY OPERATION OF LAW, COURSE OF DEALING, CUSTOM OF TRADE OR OTHERWISE. As the exclusive remedy for breach of this Warranty, we will replace defective materials, provided, however, that the buyer examine the materials when received and promptly notify us in writing of any defect before the materials are used or incorporated into a structure. Three (3) months after W. R. MEADOWS, INC. has shipped the materials, all our Warranty and other duties with respect to the quality of the materials delivered shall conclusively be presumed to have been satisfied, all liability therefore terminates, and no action for breach of any such duties may thereafter be commenced. W. R. MEADOWS, INC. shall in no event be liable for consequential damages. Unless otherwise agreed to in writing, no warranty is made with respect to materials not manufactured by W. R. MEADOWS, INC. We cannot warranty or in any way guarantee any particular method of use or application of the performance of materials under any particular condition. Neither this Warranty nor our liability may be extended or amended by our salesmen, distributors or representatives, or by our distributor's representatives, or by any sales information or drawings.

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Copyright 2002 O'Brill Company
Last modified: August 09, 2004