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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Premoulded Membrane




NO. 711


Provides the only true under-slab vaporproofing and waterproofing.

SEALTIGHT PREMOULDED MEMBRANE VAPOR SEAL with PLASMATIC CORE is a permanently bonded, multi-ply, semi-flexible core board that has never been equaled or surpassed for on-grade, below slab waterproofing or vaporproofing effectiveness. It offers a WVT rating of 0.00 grains/ft.²/hr., the lowest in the industry. Most importantly, the product will help meet and maintain the maximum slab moisture transfer rate of 3 lbs./1,000 ft.²/24 hours, required by the flooring industry specifications.

Technical Description
PREMOULDED MEMBRANE VAPOR SEAL with PLASMATIC CORE (PMPC) is a permanently bonded multi-ply semi-flexible core board. The core consists of a plasmatic matrix encased in 2 layers of pure-blown, high-meltpoint asphalt. The three-ply core is sandwiched between liners of asphalt saturated felt and a glass-mat liner. An asphalt weathercoat is applied to the glass-mat liner and covered with a polyethylene anti-stick sheet.

PMPC provides a positive, easy-to-install, economical, true vaporproofing and waterproofing system for horizontal applications. Properly applied, it stops moisture migration in footings, concrete floors and structural slabs. PREMOULDED MEMBRANE VAPOR SEAL with Plasmatic Core is both waterproof and vaporproof. It offers a (WVT) water vapor transmission rating of 0.00 grains/ft.²/hr.*, the lowest in the industry. The product is the ultimate when a true vapor seal is required. Among its unique features is the built-in protection course which resists job-site puncturing and the abrasive action of backfilling. The exclusive PLASMATIC CORE adds ductility, flexibility, greater tensile strength and excellent handling characteristics.
*As tested per ASTM E 96, Water Method.

SEALTIGHT PMPC, when properly applied, is designed to stop moisture migration (liquid or vapor) in footings, concrete floor slabs and structural slabs. It is especially useful under slabs overlaid with wood, tile, epoxy and urethane coatings, carpeting and resilient or seamless flooring systems since it helps prevent the warping and buckling caused by moisture migration.

Advantages and Benefits

bulletOffers a virtually impermeable vaporproofing system with the lowest WVT rating available. It is both waterproof and vaporproof
bulletInstalls directly over the tamped grade (no gravel fill or sand needed)
bulletOffers ductility, flexibility, greater tensile strength and excellent handling characteristics
bulletProvides the best available deterrent for warping, buckling or delamination of subsequent flooring systems

The Ultimate Vapor Barrier to Eliminate Costly Moisture Damage
Over 80% of the moisture entering a structure originates in the site...it moves from the grade into the structure both as a liquid (capillarity) and as a gas (vapor).

The only effective way to eliminate the costly problems of excessive moisture migration is to completely isolate the structure from the site during original construction with the installation of a true vapor seal membrane that is both waterproof and vaporproof. Material that is vaporproof is completely waterproof: however, not everything that is waterproof is vaporproof. PREMOULDED MEMBRANE VAPOR SEAL with PLASMATIC CORE is both waterproof and vaporproof.

While tremendously strong, even the best concrete is porous. Uncontrolled vapor will move through it, causing dank musty smells...rust and condensation damage to mechanical equipment..cracked plaster...chipped paint, efflorescence...warped floors, etc. The installation of a true vapor seal under the concrete floor slabs will stop moisture migration.

A true vapor seal must also be durable and tough enough to withstand normal handling, foot traffic, aggregate impact and backfill abrasion. One tear, or a few pinholes will destroy the entire purpose of the installation. Plastic films, laminated film and paper combinations, reinforced building papers and saturated roofing felts are semi-permeable at best, and will permit the passage of air (vapor) through them. Additional information on the hydrologic cycle may be found in W.R. Meadows Hydrologic Cycle. Manual available upon request.

SEALTIGHT PMPC offers the construction industry a positive, easy to install, economical, true vapor-proofing system solution.

Application Tools


Roofer's Knife

Caulking Gun


HORIZONTAL INSTALLATIONS – ON OR BELOW GRADE: By installing PREMOULDED MEMBRANE VAPOR SEAL with PLASMATIC CORE on the ground prior to placing the concrete floor, moisture will be prevented from coming through the floor slab.

ABOVE GRADE: By placing PREMOULDED MEMBRANE VAPOR SEAL with PLASMATIC CORE on the intermediate structural slab, moisture is prevented from filtering downward from mechanical floors dedicated to heating and air conditioning equipment. This prevents damage to lower floor levels.

HORIZONTAL APPLICATION: PREMOULDED MEMBRANE VAPOR SEAL with PLASMATIC CORE can be applied directly over tamped grade, because it does not require a gravel bed, a bed of sand and/or "crusher rock" prior to the installation of the floor slab, although these practices are acceptable. PMPC works equally well with either side up. However, in areas exposed to prolonged, direct sunlight we recommend poly side up.

Material is placed in position by either the "Dutch Lap" method with laps sealed with SEALTIGHT Catalytic Bonding Asphalt or by the "Butt-Joint" method with joints sealed with SEALTIGHT Detail Strips. These methods provide a permanent, monolithic vapor seal without voids or open seams. If desired, on structural floor slabs of multi-level buildings, sheets may be placed in a bed of hot asphalt for continuous adhesion.

THE "DUTCH LAP" METHOD: The "Dutch Lap" method of applying PMPC on or below-grade horizontal areas. After removing the polyfilm at the 6" overlap areas, seal all laps with SEALTIGHT Catalytic Bonding Asphalt. Pressure roll or "walk-in" all laps to assure complete adhesion.

THE "BUTT-JOINT" METHOD: The Butt-Joint method of applying PMPC: The sheets are tightly butted together and "Butt-Joints" sealed with SEALTIGHT Detail Strips. The Detail Strip is centered on the joints of the felt side and rolled down with pressure for a positive seal.

When estimating the amount of PMPC required, figure the actual area plus 20% for overlap when using sheets...for rolls, figure actual areas plus 12% for overlap.

Handling Suggestions
CUTTING: PREMOULDED MEMBRANE VAPOR SEAL can be cut with a roofer's or linoleum knife using a straight edge.

BENDING: To facilitate bending at a change in plane such as at corners or footings, lightly heat the board at the bending area.

STORAGE: Handling of PMPC is not critical because of its strength; however, it is advisable to stack the material on smooth ground or a wood platform in storage or at the excavation site. This will eliminate the possibility of the PREMOULDED MEMBRANE sheets deforming or warping.

POINTING: Pointing with SEALTIGHT Pointing Mastic should be done wherever an edge is exposed to prevent water from traveling under a sheet.

Sealing Procedures
All protrusions through the concrete slab, such as sewer pipes, water pipes and utility inlets, must have a positive seal between the protrusion and the PREMOULDED MEMBRANE. Place a collar of PMPC at least 12" larger than the protrusion around the protrusion. Seal in place with SEALTIGHT Detail Strips and point around the protrusion with SEALTIGHT Pointing Mastic.

BONDING ADHESIVES: SEALTIGHT Catalytic Bonding Asphalt: A non-setting bitumen that provides a seal that will expand and contract without breaking bond. Use to seal horizontal joints and rebars between impaction sheets on footing. Packaging: 5 gallon (18.93 liter) Pails

COVERAGE: 5 gallons per 1,000 ft.² of material.

SEALTIGHT PM-5X: A hard-setting bitumen offering strong initial tack, used to adhere PREMOULDED MEMBRANE to vertical surfaces.
Packaging: 5 gallon (18.93 liter) Pails

SEALTIGHT Detail Strip: A sturdy, self-adhering, reinforced tape of polymeric membrane that requires no additional adhesive. Provides a simple, easy and economical method of effectively sealing horizontal and vertical butt joints. Each strip is nominally 9" (.23m) wide and 50' (15.24m) long. Has quick-strip release paper for ease of handling and application. Packaged 4 rolls per carton.

SEALTIGHT Pointing Mastic is used for sealing top horizontal terminations or slab protrusions
Packaging: 5 gallon (18.93 liter) Pails or 29 oz. (857.65 ml) Cartridges.
For full details, see Product Data Sheet No. 740-PD.

  Width  Length  Weight 
Sheets  48" (1.22m)  8' (2.44m)  65 lbs./100 ft² (29.48 kg) 
Rolls  48" (1.22m)  50' (15.24m)  60 lbs./100 ft² (27.22 kg) 

Adhesive  Joint Method Per MSF of Membrane (Approx.)
Catalytic Bonding Asphalt*  Sheets: 6" (152.4mm) laps  5 gal. (18.93 liters) 
  Rolls: 6" (152.4mm) laps  3 gal. (11.36 liters) 
PM-5X  Sheets only 40 gal. (151.4 liters)
Hot-Mop Asphalt*  Complete  400-500 lbs. (180-230 kg) 
Detail Strips  Butt-Joints  416 linear ft. (126.8m) 
Pointing Mastic**  Detail Strip Edge Terminations  2000 lineal ft./gal. (161.0m/L) 
*Based on minimum of 1/16" (1.59mm) film thickness 
**1/8"x 1"x 200 lineal feet (3.18mm x 25.4mm x 60.96m) 

Maintain Energy Efficiency
SEALTIGHT Products used in conjunction with structural construction aid in the integrity of other structural systems such as insulation. Because wet insulating materials lose much of their R factor performance characteristics, this reduces the energy efficiency of the structure. SEALTIGHT Products applied for thermal and moisture protection help prevent moisture or vapor penetration into the other systems. These products play a key role in maintaining the structure's energy efficiency.

PREMOULDED MEMBRANE VAPOR SEAL does not negate the need for relief of hydrostatic heads. A complete drain tile system should be placed on the exterior of the footing and, in severe cases, on the interior of the footing as well. If applied to concrete surfaces... repair any spalled areas... fill all voids and remove sharp protusions.

Adhesive coverage ratios must be adjusted to compensate for surface irregularities and additional coats may be required to provide proper adhesion. For maximum concrete performance and durability, the floor slab concrete design should provide for the lowest possible slump and yet assure complete hydration of the concrete. Refer to Material Safety Data Sheet for complete health and safety information.

This material last updated January, 2000.


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